The American Journal of Orthopedics

LAS VEGAS—While men and women have similar levels of improvement following total knee replacement (TKR) surgery, men have higher levels of function before and after TKR, according to new research presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS).

According to the Agency for Healthcare Research and Quality, more than 600,000 knee replacements are performed in the United States each year. In 2012, 393,345 women and 237,896 men underwent TKR, most often to alleviate the pain and immobility associated with late-stage arthritis. While research has looked at the anatomic differences between the knees of men and women, the higher levels of arthritis in women versus men, and the utilization of TKR among men and women, there has been little study on how gender influences the level of function before and after surgery.

In this study, researchers identified and studied 287 TKR patients at 7 different institutions between 2005 and 2007. All of the patients were between the ages of 21 and 80 years at the time of surgery and had a body mass index less than 40 g/m². All of the patients except 2 had a diagnosis of end-stage arthritis. The patient group included 108 men (112 knees) with a mean age of 67 years, and 170 women with a mean age of 66 years. All of the patients were evaluated preoperatively and at the following 6 points following surgery: 6 weeks, 3 months, 1 year, 2 years, 5 years, and 7 years. A Kaplan-Meier assessment gauged implant survival, and quality-of-life measurements were taken at 3 and 4 years post-surgery. During each evaluation, researchers measured knee function, range of motion, extremity activity, and overall health.

At 5 years post-surgery, implant survival was 100% for men and 99.1% for women. Range of motion also was nearly identical between genders. Functional scores were consistently higher for the men versus women: preoperatively, 57.1 versus 51; postoperatively at 6 weeks, 63.7 versus 51.5; at 3 months, 83.1 versus 74.3; at 2 years, 90 versus 81.6; at 5 years, 90.1 versus 82.9; and at 7 years, 96 versus 79.5. Men also recovered faster within the 6-week recovery time after surgery; however, both genders had almost identical improvement in mean knee score function (improvement from presurgical levels) at 5 years.

“Our data supports that while both genders benefit from TKR, men have higher levels of function and activity both prior to and after TKR compared to women,” said investigators Jeffrey J. Cherian, DO, and Michael A. Mont, MD. “These functional outcome differences are most likely due to many factors, including biologic/genetic, and highlight the need for further research related to the role of gender of both the patient and the surgeon in the decision making process of TKR, sex-based biological differences in functional recovery capacity, and whether sex/gender based pre- and postoperative rehabilitation protocols are warranted.”

LAS VEGAS—While men and women have similar levels of improvement following total knee replacement (TKR) surgery, men have higher levels of function before and after TKR, according to new research presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS).

According to the Agency for Healthcare Research and Quality, more than 600,000 knee replacements are performed in the United States each year. In 2012, 393,345 women and 237,896 men underwent TKR, most often to alleviate the pain and immobility associated with late-stage arthritis. While research has looked at the anatomic differences between the knees of men and women, the higher levels of arthritis in women versus men, and the utilization of TKR among men and women, there has been little study on how gender influences the level of function before and after surgery.

In this study, researchers identified and studied 287 TKR patients at 7 different institutions between 2005 and 2007. All of the patients were between the ages of 21 and 80 years at the time of surgery and had a body mass index less than 40 g/m². All of the patients except 2 had a diagnosis of end-stage arthritis. The patient group included 108 men (112 knees) with a mean age of 67 years, and 170 women with a mean age of 66 years. All of the patients were evaluated preoperatively and at the following 6 points following surgery: 6 weeks, 3 months, 1 year, 2 years, 5 years, and 7 years. A Kaplan-Meier assessment gauged implant survival, and quality-of-life measurements were taken at 3 and 4 years post-surgery. During each evaluation, researchers measured knee function, range of motion, extremity activity, and overall health.

At 5 years post-surgery, implant survival was 100% for men and 99.1% for women. Range of motion also was nearly identical between genders. Functional scores were consistently higher for the men versus women: preoperatively, 57.1 versus 51; postoperatively at 6 weeks, 63.7 versus 51.5; at 3 months, 83.1 versus 74.3; at 2 years, 90 versus 81.6; at 5 years, 90.1 versus 82.9; and at 7 years, 96 versus 79.5. Men also recovered faster within the 6-week recovery time after surgery; however, both genders had almost identical improvement in mean knee score function (improvement from presurgical levels) at 5 years.

“Our data supports that while both genders benefit from TKR, men have higher levels of function and activity both prior to and after TKR compared to women,” said investigators Jeffrey J. Cherian, DO, and Michael A. Mont, MD. “These functional outcome differences are most likely due to many factors, including biologic/genetic, and highlight the need for further research related to the role of gender of both the patient and the surgeon in the decision making process of TKR, sex-based biological differences in functional recovery capacity, and whether sex/gender based pre- and postoperative rehabilitation protocols are warranted.”

LAS VEGAS—While men and women have similar levels of improvement following total knee replacement (TKR) surgery, men have higher levels of function before and after TKR, according to new research presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS).

According to the Agency for Healthcare Research and Quality, more than 600,000 knee replacements are performed in the United States each year. In 2012, 393,345 women and 237,896 men underwent TKR, most often to alleviate the pain and immobility associated with late-stage arthritis. While research has looked at the anatomic differences between the knees of men and women, the higher levels of arthritis in women versus men, and the utilization of TKR among men and women, there has been little study on how gender influences the level of function before and after surgery.

In this study, researchers identified and studied 287 TKR patients at 7 different institutions between 2005 and 2007. All of the patients were between the ages of 21 and 80 years at the time of surgery and had a body mass index less than 40 g/m². All of the patients except 2 had a diagnosis of end-stage arthritis. The patient group included 108 men (112 knees) with a mean age of 67 years, and 170 women with a mean age of 66 years. All of the patients were evaluated preoperatively and at the following 6 points following surgery: 6 weeks, 3 months, 1 year, 2 years, 5 years, and 7 years. A Kaplan-Meier assessment gauged implant survival, and quality-of-life measurements were taken at 3 and 4 years post-surgery. During each evaluation, researchers measured knee function, range of motion, extremity activity, and overall health.

At 5 years post-surgery, implant survival was 100% for men and 99.1% for women. Range of motion also was nearly identical between genders. Functional scores were consistently higher for the men versus women: preoperatively, 57.1 versus 51; postoperatively at 6 weeks, 63.7 versus 51.5; at 3 months, 83.1 versus 74.3; at 2 years, 90 versus 81.6; at 5 years, 90.1 versus 82.9; and at 7 years, 96 versus 79.5. Men also recovered faster within the 6-week recovery time after surgery; however, both genders had almost identical improvement in mean knee score function (improvement from presurgical levels) at 5 years.

“Our data supports that while both genders benefit from TKR, men have higher levels of function and activity both prior to and after TKR compared to women,” said investigators Jeffrey J. Cherian, DO, and Michael A. Mont, MD. “These functional outcome differences are most likely due to many factors, including biologic/genetic, and highlight the need for further research related to the role of gender of both the patient and the surgeon in the decision making process of TKR, sex-based biological differences in functional recovery capacity, and whether sex/gender based pre- and postoperative rehabilitation protocols are warranted.”

LAS VEGAS—Routine bisphosphonate treatment of women older than 65 years who sustain a distal radius fracture could significantly reduce the risk for additional fractures, primarily hip fractures, but at an estimated cost of more than $2 billion annually, according to a study presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS).

More than 50% of men and women older than 80 years meet diagnostic criteria for osteoporosis, placing them at increased risk for bone fractures, including hip fractures, which cause an estimated 300,000 unplanned hospital admissions in the United States each year. The lifetime cost of a hip fracture is estimated at $81,300, of which approximately 44% of the costs are associated with nursing facility expenses. Bisphosphonates, a drug known to increase bone mass and prevent fractures, have been associated with atypical femur fractures in a small, but significant number of patients.

Researchers reviewed existing literature and Medicare data to determine distal radius fracture incidence and age-specific hip fracture rates after distal radius fracture with and without bisphosphonate treatment. A model was then created to determine future fracture rates with and without treatment and related costs.

The model predicted 357,656 lifetime hip fractures following distal radius fracture in all females age 65 years and older in the US. If these patients received regular bisphosphonate treatment following a distal radius fracture, the number of hip fractures would drop to 262,767 over the lifetime of these patients; however, an estimated 19,464 patients would suffer an atypical femur fracture as a result of the treatment.

The cost of routine bisphosphonate treatment, including the cost for treating associated atypical femur fractures, comes to a lifetime total of $19.5 billion, or approximately $205,534 per avoided hip fracture.

“Our study suggests that routine universal utilization of bisphosphonates in elderly women after distal radius fracture would not be economically advantageous despite the cost savings associated with reduction of the hip fracture burden in that population,” said lead study author, Suneel B. Bhat, MD, an orthopedic surgery resident at the Rothman Institute in Philadelphia.

The study authors also hypothesize that the cost of bisphosphonates would need to drop to $70 per patient each year, from the current average annual wholesale cost of $1,485 per patient, to make the treatment affordable to every patient age 65 years and older following a wrist fracture. In addition, selecting patients at lower risk for atypical femur fractures for treatment may reduce the number of bisphosphonate-related fractures. Confirming patient osteoporosis and fracture risk through a DEXA Scan (dual x-ray absorptiometry) before prescribing bisphosphonates remains the most cost-effective method for treating osteoporosis and avoiding subsequent fractures.

LAS VEGAS—Routine bisphosphonate treatment of women older than 65 years who sustain a distal radius fracture could significantly reduce the risk for additional fractures, primarily hip fractures, but at an estimated cost of more than $2 billion annually, according to a study presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS).

More than 50% of men and women older than 80 years meet diagnostic criteria for osteoporosis, placing them at increased risk for bone fractures, including hip fractures, which cause an estimated 300,000 unplanned hospital admissions in the United States each year. The lifetime cost of a hip fracture is estimated at $81,300, of which approximately 44% of the costs are associated with nursing facility expenses. Bisphosphonates, a drug known to increase bone mass and prevent fractures, have been associated with atypical femur fractures in a small, but significant number of patients.

Researchers reviewed existing literature and Medicare data to determine distal radius fracture incidence and age-specific hip fracture rates after distal radius fracture with and without bisphosphonate treatment. A model was then created to determine future fracture rates with and without treatment and related costs.

The model predicted 357,656 lifetime hip fractures following distal radius fracture in all females age 65 years and older in the US. If these patients received regular bisphosphonate treatment following a distal radius fracture, the number of hip fractures would drop to 262,767 over the lifetime of these patients; however, an estimated 19,464 patients would suffer an atypical femur fracture as a result of the treatment.

The cost of routine bisphosphonate treatment, including the cost for treating associated atypical femur fractures, comes to a lifetime total of $19.5 billion, or approximately $205,534 per avoided hip fracture.

“Our study suggests that routine universal utilization of bisphosphonates in elderly women after distal radius fracture would not be economically advantageous despite the cost savings associated with reduction of the hip fracture burden in that population,” said lead study author, Suneel B. Bhat, MD, an orthopedic surgery resident at the Rothman Institute in Philadelphia.

The study authors also hypothesize that the cost of bisphosphonates would need to drop to $70 per patient each year, from the current average annual wholesale cost of $1,485 per patient, to make the treatment affordable to every patient age 65 years and older following a wrist fracture. In addition, selecting patients at lower risk for atypical femur fractures for treatment may reduce the number of bisphosphonate-related fractures. Confirming patient osteoporosis and fracture risk through a DEXA Scan (dual x-ray absorptiometry) before prescribing bisphosphonates remains the most cost-effective method for treating osteoporosis and avoiding subsequent fractures.

LAS VEGAS—Routine bisphosphonate treatment of women older than 65 years who sustain a distal radius fracture could significantly reduce the risk for additional fractures, primarily hip fractures, but at an estimated cost of more than $2 billion annually, according to a study presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS).

More than 50% of men and women older than 80 years meet diagnostic criteria for osteoporosis, placing them at increased risk for bone fractures, including hip fractures, which cause an estimated 300,000 unplanned hospital admissions in the United States each year. The lifetime cost of a hip fracture is estimated at $81,300, of which approximately 44% of the costs are associated with nursing facility expenses. Bisphosphonates, a drug known to increase bone mass and prevent fractures, have been associated with atypical femur fractures in a small, but significant number of patients.

Researchers reviewed existing literature and Medicare data to determine distal radius fracture incidence and age-specific hip fracture rates after distal radius fracture with and without bisphosphonate treatment. A model was then created to determine future fracture rates with and without treatment and related costs.

The model predicted 357,656 lifetime hip fractures following distal radius fracture in all females age 65 years and older in the US. If these patients received regular bisphosphonate treatment following a distal radius fracture, the number of hip fractures would drop to 262,767 over the lifetime of these patients; however, an estimated 19,464 patients would suffer an atypical femur fracture as a result of the treatment.

The cost of routine bisphosphonate treatment, including the cost for treating associated atypical femur fractures, comes to a lifetime total of $19.5 billion, or approximately $205,534 per avoided hip fracture.

“Our study suggests that routine universal utilization of bisphosphonates in elderly women after distal radius fracture would not be economically advantageous despite the cost savings associated with reduction of the hip fracture burden in that population,” said lead study author, Suneel B. Bhat, MD, an orthopedic surgery resident at the Rothman Institute in Philadelphia.

The study authors also hypothesize that the cost of bisphosphonates would need to drop to $70 per patient each year, from the current average annual wholesale cost of $1,485 per patient, to make the treatment affordable to every patient age 65 years and older following a wrist fracture. In addition, selecting patients at lower risk for atypical femur fractures for treatment may reduce the number of bisphosphonate-related fractures. Confirming patient osteoporosis and fracture risk through a DEXA Scan (dual x-ray absorptiometry) before prescribing bisphosphonates remains the most cost-effective method for treating osteoporosis and avoiding subsequent fractures.

LAS VEGAS─Nearly 50% of hip fracture patients, age 65 years and older, had delirium before, during, and after surgery, resulting in significantly longer hospital stays and higher costs for care, according to data presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS). Delirium was associated with 7.4 additional hospital days and approximately $8,000 more in hospital costs.

Approximately 300,000 Americans are hospitalized with hip fractures each year. The risk is particularly high in post-menopausal women who face an increased risk for osteoporosis. Delirium is common among older hip fracture patients, and multiple studies have found that patients with postoperative delirium are more likely to have complications, including infections, and less likely to return to their pre-injury level of function. Delirium patients also are more frequently placed in nursing homes following surgery and have an increased rate of mortality.

In this study, researchers at the University of Toronto sought to determine the economic implications of perioperative delirium in older orthopedic patients by reviewing hip fracture records between January 2011 and December 2012. A total of 242 hip fracture patients with a mean age of 82 years (ages 65 to 103 years) were studied. Demographic, clinical, surgical, and adverse events data were analyzed. Perioperative delirium was assessed using the Confusion Assessment Method (CAM).

The study found that 116 patients (48%) experienced delirium during hospital admission. The patients with delirium were significantly older (mean age 85 years), and were more likely to have a higher American Society of Anesthesiologists (ASA) score (1 represents a completely healthy fit patient, and 5 represents a patient not expected to live beyond 24 hours without surgery). After controlling for these differences, perioperative delirium was associated with 7.4 additional hospital days and $8,282 ($8,649 in US dollars) in additional hospital costs (1.5 times the cost of patients who did not experience delirium).

There were no differences in mean time between triage or admission and surgery, length of surgery, or anesthesia type between groups. A significantly greater proportion of patients who experienced perioperative delirium required long-term and/or skilled care facility admission following their hospital stay than did those who did not experience delirium (8% versus 0%).

“Older patients are at high risk of developing delirium during hospitalization for a hip fracture, which is associated with worse outcomes,” said orthopedic surgeon and lead study author Michael G. Zywiel, MD. “Our work demonstrates that delirium also markedly increases the cost of elderly patient care while in the hospital. Given the high number of patients hospitalized every year with a hip fracture, there is a real need to develop and fund improved interventions to prevent in-hospital delirium in these patients.

“Our research suggests that reducing the rate of delirium would simultaneously increase the quality of care while decreasing costs, presenting hospitals, surgeons, and other stakeholders with promising opportunities to improve the value of hip fracture care,” said Dr. Zywiel.

The AAOS’s new clinical practice guideline, “Management of Hip Fractures in the Elderly,” makes a series of recommendations to reduce delirium in older hip fracture patients. They include:

• Preoperative regional analgesia to reduce pain.

• Hip fracture surgery within 48 hours of hospital admission.

• Intensive physical therapy following hospital discharge to improve functional outcomes.

• An osteoporosis evaluation, as well as vitamin D and calcium supplements, for patients following a hip fracture.

LAS VEGAS─Nearly 50% of hip fracture patients, age 65 years and older, had delirium before, during, and after surgery, resulting in significantly longer hospital stays and higher costs for care, according to data presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS). Delirium was associated with 7.4 additional hospital days and approximately $8,000 more in hospital costs.

Approximately 300,000 Americans are hospitalized with hip fractures each year. The risk is particularly high in post-menopausal women who face an increased risk for osteoporosis. Delirium is common among older hip fracture patients, and multiple studies have found that patients with postoperative delirium are more likely to have complications, including infections, and less likely to return to their pre-injury level of function. Delirium patients also are more frequently placed in nursing homes following surgery and have an increased rate of mortality.

In this study, researchers at the University of Toronto sought to determine the economic implications of perioperative delirium in older orthopedic patients by reviewing hip fracture records between January 2011 and December 2012. A total of 242 hip fracture patients with a mean age of 82 years (ages 65 to 103 years) were studied. Demographic, clinical, surgical, and adverse events data were analyzed. Perioperative delirium was assessed using the Confusion Assessment Method (CAM).

The study found that 116 patients (48%) experienced delirium during hospital admission. The patients with delirium were significantly older (mean age 85 years), and were more likely to have a higher American Society of Anesthesiologists (ASA) score (1 represents a completely healthy fit patient, and 5 represents a patient not expected to live beyond 24 hours without surgery). After controlling for these differences, perioperative delirium was associated with 7.4 additional hospital days and $8,282 ($8,649 in US dollars) in additional hospital costs (1.5 times the cost of patients who did not experience delirium).

There were no differences in mean time between triage or admission and surgery, length of surgery, or anesthesia type between groups. A significantly greater proportion of patients who experienced perioperative delirium required long-term and/or skilled care facility admission following their hospital stay than did those who did not experience delirium (8% versus 0%).

“Older patients are at high risk of developing delirium during hospitalization for a hip fracture, which is associated with worse outcomes,” said orthopedic surgeon and lead study author Michael G. Zywiel, MD. “Our work demonstrates that delirium also markedly increases the cost of elderly patient care while in the hospital. Given the high number of patients hospitalized every year with a hip fracture, there is a real need to develop and fund improved interventions to prevent in-hospital delirium in these patients.

“Our research suggests that reducing the rate of delirium would simultaneously increase the quality of care while decreasing costs, presenting hospitals, surgeons, and other stakeholders with promising opportunities to improve the value of hip fracture care,” said Dr. Zywiel.

The AAOS’s new clinical practice guideline, “Management of Hip Fractures in the Elderly,” makes a series of recommendations to reduce delirium in older hip fracture patients. They include:

• Preoperative regional analgesia to reduce pain.

• Hip fracture surgery within 48 hours of hospital admission.

• Intensive physical therapy following hospital discharge to improve functional outcomes.

• An osteoporosis evaluation, as well as vitamin D and calcium supplements, for patients following a hip fracture.

LAS VEGAS─Nearly 50% of hip fracture patients, age 65 years and older, had delirium before, during, and after surgery, resulting in significantly longer hospital stays and higher costs for care, according to data presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS). Delirium was associated with 7.4 additional hospital days and approximately $8,000 more in hospital costs.

Approximately 300,000 Americans are hospitalized with hip fractures each year. The risk is particularly high in post-menopausal women who face an increased risk for osteoporosis. Delirium is common among older hip fracture patients, and multiple studies have found that patients with postoperative delirium are more likely to have complications, including infections, and less likely to return to their pre-injury level of function. Delirium patients also are more frequently placed in nursing homes following surgery and have an increased rate of mortality.

In this study, researchers at the University of Toronto sought to determine the economic implications of perioperative delirium in older orthopedic patients by reviewing hip fracture records between January 2011 and December 2012. A total of 242 hip fracture patients with a mean age of 82 years (ages 65 to 103 years) were studied. Demographic, clinical, surgical, and adverse events data were analyzed. Perioperative delirium was assessed using the Confusion Assessment Method (CAM).

The study found that 116 patients (48%) experienced delirium during hospital admission. The patients with delirium were significantly older (mean age 85 years), and were more likely to have a higher American Society of Anesthesiologists (ASA) score (1 represents a completely healthy fit patient, and 5 represents a patient not expected to live beyond 24 hours without surgery). After controlling for these differences, perioperative delirium was associated with 7.4 additional hospital days and $8,282 ($8,649 in US dollars) in additional hospital costs (1.5 times the cost of patients who did not experience delirium).

There were no differences in mean time between triage or admission and surgery, length of surgery, or anesthesia type between groups. A significantly greater proportion of patients who experienced perioperative delirium required long-term and/or skilled care facility admission following their hospital stay than did those who did not experience delirium (8% versus 0%).

“Older patients are at high risk of developing delirium during hospitalization for a hip fracture, which is associated with worse outcomes,” said orthopedic surgeon and lead study author Michael G. Zywiel, MD. “Our work demonstrates that delirium also markedly increases the cost of elderly patient care while in the hospital. Given the high number of patients hospitalized every year with a hip fracture, there is a real need to develop and fund improved interventions to prevent in-hospital delirium in these patients.

“Our research suggests that reducing the rate of delirium would simultaneously increase the quality of care while decreasing costs, presenting hospitals, surgeons, and other stakeholders with promising opportunities to improve the value of hip fracture care,” said Dr. Zywiel.

The AAOS’s new clinical practice guideline, “Management of Hip Fractures in the Elderly,” makes a series of recommendations to reduce delirium in older hip fracture patients. They include:

• Preoperative regional analgesia to reduce pain.

• Hip fracture surgery within 48 hours of hospital admission.

• Intensive physical therapy following hospital discharge to improve functional outcomes.

• An osteoporosis evaluation, as well as vitamin D and calcium supplements, for patients following a hip fracture.

LAS VEGAS─In recent years there has been an explosion in barefoot running, as well as the purchase and use of “minimalist” running shoes that more closely resemble barefoot running by encouraging the balls of the feet, between the arch and toes, to hit the pavement first. A new study presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS) found that a significant number of experienced runners, age 30 years and older (40% of men and 20% of women), maintained a heel-first running pattern—which naturally occurs when wearing a shoe with an elevated heel—when running without shoes. Maintaining a heel-toe pattern while running barefoot or in a minimalist shoe may lead to more frequent injuries.

“Previous studies have demonstrated that an adolescent runner’s foot strike is heavily influenced by their running shoe,” said orthopedic surgeon Scott Mullen, MD, the lead author of the study. “Young runners quickly adapt to a forefoot strike pattern when running barefoot, whereas a heel strike is normally associated with wearing large-heeled training shoes.”

In this study, a team of researchers from the University of Kansas Department of Orthopedics and Sports Medicine measured the heel-to-toe drop of 26 runners, all age 30 years or older with at least 10 years of running experience, when each ran in a traditional running shoe, and again when barefoot. The heel and forefoot thickness was measured at running speeds of 6, 7, and 8 miles per hour (mph) for women, and 7, 8, and 9 mph for men. A motion capture system was utilized to analyze foot strikes by a single blinded examiner skilled in the use of the camera system and running mechanics.

Heel-to-toe thickness of the running shoe did not significantly correlate with a change in heel strike, nor did alterations in speed. Running barefoot resulted in a significant drop in percent heel strike at all speeds; however, 40% of the men and 20% of the women persisted with consistent strike patterns across all speeds with and without shoes.

“Our study indicates that older runners (age 30 years and older) are not able to adapt as quickly to running barefoot,” said Dr. Mullen. “The inability to adapt the foot strike to the change in shoe type may put these runners at increased risk of injury. Older runners should be cautious when transitioning to a more minimalist type of shoe.”

LAS VEGAS─In recent years there has been an explosion in barefoot running, as well as the purchase and use of “minimalist” running shoes that more closely resemble barefoot running by encouraging the balls of the feet, between the arch and toes, to hit the pavement first. A new study presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS) found that a significant number of experienced runners, age 30 years and older (40% of men and 20% of women), maintained a heel-first running pattern—which naturally occurs when wearing a shoe with an elevated heel—when running without shoes. Maintaining a heel-toe pattern while running barefoot or in a minimalist shoe may lead to more frequent injuries.

“Previous studies have demonstrated that an adolescent runner’s foot strike is heavily influenced by their running shoe,” said orthopedic surgeon Scott Mullen, MD, the lead author of the study. “Young runners quickly adapt to a forefoot strike pattern when running barefoot, whereas a heel strike is normally associated with wearing large-heeled training shoes.”

In this study, a team of researchers from the University of Kansas Department of Orthopedics and Sports Medicine measured the heel-to-toe drop of 26 runners, all age 30 years or older with at least 10 years of running experience, when each ran in a traditional running shoe, and again when barefoot. The heel and forefoot thickness was measured at running speeds of 6, 7, and 8 miles per hour (mph) for women, and 7, 8, and 9 mph for men. A motion capture system was utilized to analyze foot strikes by a single blinded examiner skilled in the use of the camera system and running mechanics.

Heel-to-toe thickness of the running shoe did not significantly correlate with a change in heel strike, nor did alterations in speed. Running barefoot resulted in a significant drop in percent heel strike at all speeds; however, 40% of the men and 20% of the women persisted with consistent strike patterns across all speeds with and without shoes.

“Our study indicates that older runners (age 30 years and older) are not able to adapt as quickly to running barefoot,” said Dr. Mullen. “The inability to adapt the foot strike to the change in shoe type may put these runners at increased risk of injury. Older runners should be cautious when transitioning to a more minimalist type of shoe.”

LAS VEGAS─In recent years there has been an explosion in barefoot running, as well as the purchase and use of “minimalist” running shoes that more closely resemble barefoot running by encouraging the balls of the feet, between the arch and toes, to hit the pavement first. A new study presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS) found that a significant number of experienced runners, age 30 years and older (40% of men and 20% of women), maintained a heel-first running pattern—which naturally occurs when wearing a shoe with an elevated heel—when running without shoes. Maintaining a heel-toe pattern while running barefoot or in a minimalist shoe may lead to more frequent injuries.

“Previous studies have demonstrated that an adolescent runner’s foot strike is heavily influenced by their running shoe,” said orthopedic surgeon Scott Mullen, MD, the lead author of the study. “Young runners quickly adapt to a forefoot strike pattern when running barefoot, whereas a heel strike is normally associated with wearing large-heeled training shoes.”

In this study, a team of researchers from the University of Kansas Department of Orthopedics and Sports Medicine measured the heel-to-toe drop of 26 runners, all age 30 years or older with at least 10 years of running experience, when each ran in a traditional running shoe, and again when barefoot. The heel and forefoot thickness was measured at running speeds of 6, 7, and 8 miles per hour (mph) for women, and 7, 8, and 9 mph for men. A motion capture system was utilized to analyze foot strikes by a single blinded examiner skilled in the use of the camera system and running mechanics.

Heel-to-toe thickness of the running shoe did not significantly correlate with a change in heel strike, nor did alterations in speed. Running barefoot resulted in a significant drop in percent heel strike at all speeds; however, 40% of the men and 20% of the women persisted with consistent strike patterns across all speeds with and without shoes.

“Our study indicates that older runners (age 30 years and older) are not able to adapt as quickly to running barefoot,” said Dr. Mullen. “The inability to adapt the foot strike to the change in shoe type may put these runners at increased risk of injury. Older runners should be cautious when transitioning to a more minimalist type of shoe.”

LAS VEGAS—Improved surgical, pain management, and rehabilitation procedures can allow patients who undergo a total hip replacement (THR) to safely drive as early as 2 weeks following surgery, according to new research presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS).

Each year, more than 322,000 patients undergo hip replacement surgery in the United States. Previous studies, conducted more than a decade ago, recommended between 6 and 8 weeks of recovery before driving; however, recent advances in surgical treatment and care may have shortened this time frame. A shorter driving ban would allow patients to more quickly resume daily activities and return to work.

In this study, which appeared online November 2014 in the Journal of Arthroplasty, researchers evaluated 38 patients who underwent right THR between 2013 and 2014. Driving performance was evaluated using the Brake Reaction Test (BRT), which measures brake time reaction after a stimulus. All patients underwent preoperative assessment to establish a baseline reaction time, and then agreed to be retested at 2, 4, and 6 weeks after surgery. Patients were allowed to drive when their postoperative reaction time was equal to or less than their preoperative baseline reaction time. At each testing session patients were asked if they felt ready to drive again.

Of the 38 patients, 33 (87%) reached their baseline time within 2 weeks. The remaining patients (13%) reached their baseline at 4 weeks. Among the other findings of the study:

• There were no differences with respect to age, gender, or the use of assistance devices in terms of driving readiness.

• Of the 33 patients who tested ready to drive at 2 weeks, 24 (73%) stated that they felt ready to drive while 5 (15%) were not sure. Four patients (12%) reported that they did not feel ready to drive.

• Of the 5 patients who returned to driving at 4 weeks, 3 agreed that they were not able to drive at the 2-week mark, and the other 2 thought they were able to drive by 2 weeks.

“We found that brake reaction time returned to baseline or better in the vast majority of patients undergoing contemporary THR by 2 weeks following surgery, and all patients achieved a safe brake reaction time according to nationally recognized guidelines,” said lead study author and orthopedic surgeon Victor Hugo Hernandez, MD.

Dr. Hernandez said the “findings have allowed us to encourage patients to re-evaluate their driving ability as soon as 2 weeks after THR,” but warned that the study results “are based on our particular population, and caution should be taken in translating these results to the regular population.” In addition, patients should never drive if they are still taking narcotic pain medication.

LAS VEGAS—Improved surgical, pain management, and rehabilitation procedures can allow patients who undergo a total hip replacement (THR) to safely drive as early as 2 weeks following surgery, according to new research presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS).

Each year, more than 322,000 patients undergo hip replacement surgery in the United States. Previous studies, conducted more than a decade ago, recommended between 6 and 8 weeks of recovery before driving; however, recent advances in surgical treatment and care may have shortened this time frame. A shorter driving ban would allow patients to more quickly resume daily activities and return to work.

In this study, which appeared online November 2014 in the Journal of Arthroplasty, researchers evaluated 38 patients who underwent right THR between 2013 and 2014. Driving performance was evaluated using the Brake Reaction Test (BRT), which measures brake time reaction after a stimulus. All patients underwent preoperative assessment to establish a baseline reaction time, and then agreed to be retested at 2, 4, and 6 weeks after surgery. Patients were allowed to drive when their postoperative reaction time was equal to or less than their preoperative baseline reaction time. At each testing session patients were asked if they felt ready to drive again.

Of the 38 patients, 33 (87%) reached their baseline time within 2 weeks. The remaining patients (13%) reached their baseline at 4 weeks. Among the other findings of the study:

• There were no differences with respect to age, gender, or the use of assistance devices in terms of driving readiness.

• Of the 33 patients who tested ready to drive at 2 weeks, 24 (73%) stated that they felt ready to drive while 5 (15%) were not sure. Four patients (12%) reported that they did not feel ready to drive.

• Of the 5 patients who returned to driving at 4 weeks, 3 agreed that they were not able to drive at the 2-week mark, and the other 2 thought they were able to drive by 2 weeks.

“We found that brake reaction time returned to baseline or better in the vast majority of patients undergoing contemporary THR by 2 weeks following surgery, and all patients achieved a safe brake reaction time according to nationally recognized guidelines,” said lead study author and orthopedic surgeon Victor Hugo Hernandez, MD.

Dr. Hernandez said the “findings have allowed us to encourage patients to re-evaluate their driving ability as soon as 2 weeks after THR,” but warned that the study results “are based on our particular population, and caution should be taken in translating these results to the regular population.” In addition, patients should never drive if they are still taking narcotic pain medication.

LAS VEGAS—Improved surgical, pain management, and rehabilitation procedures can allow patients who undergo a total hip replacement (THR) to safely drive as early as 2 weeks following surgery, according to new research presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS).

Each year, more than 322,000 patients undergo hip replacement surgery in the United States. Previous studies, conducted more than a decade ago, recommended between 6 and 8 weeks of recovery before driving; however, recent advances in surgical treatment and care may have shortened this time frame. A shorter driving ban would allow patients to more quickly resume daily activities and return to work.

In this study, which appeared online November 2014 in the Journal of Arthroplasty, researchers evaluated 38 patients who underwent right THR between 2013 and 2014. Driving performance was evaluated using the Brake Reaction Test (BRT), which measures brake time reaction after a stimulus. All patients underwent preoperative assessment to establish a baseline reaction time, and then agreed to be retested at 2, 4, and 6 weeks after surgery. Patients were allowed to drive when their postoperative reaction time was equal to or less than their preoperative baseline reaction time. At each testing session patients were asked if they felt ready to drive again.

Of the 38 patients, 33 (87%) reached their baseline time within 2 weeks. The remaining patients (13%) reached their baseline at 4 weeks. Among the other findings of the study:

• There were no differences with respect to age, gender, or the use of assistance devices in terms of driving readiness.

• Of the 33 patients who tested ready to drive at 2 weeks, 24 (73%) stated that they felt ready to drive while 5 (15%) were not sure. Four patients (12%) reported that they did not feel ready to drive.

• Of the 5 patients who returned to driving at 4 weeks, 3 agreed that they were not able to drive at the 2-week mark, and the other 2 thought they were able to drive by 2 weeks.

“We found that brake reaction time returned to baseline or better in the vast majority of patients undergoing contemporary THR by 2 weeks following surgery, and all patients achieved a safe brake reaction time according to nationally recognized guidelines,” said lead study author and orthopedic surgeon Victor Hugo Hernandez, MD.

Dr. Hernandez said the “findings have allowed us to encourage patients to re-evaluate their driving ability as soon as 2 weeks after THR,” but warned that the study results “are based on our particular population, and caution should be taken in translating these results to the regular population.” In addition, patients should never drive if they are still taking narcotic pain medication.

LAS VEGAS—Chronic low back pain can limit everyday activities, including sex. New research presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS) found that 70% of patients consider sexual activity “relevant” to their quality of life, and patients who receive surgical treatment for spinal degenerative spondylolisthesis (DS) and spinal stenosis (SS) were twice as likely to report no pain during sex.

“Our current research sheds light on the effect that spinal surgery has on a patient’s sex life and begins to describe the impact spinal disease has on this very important aspect of life,” said senior study author Shane Burch, MD, an orthopedic surgeon at the University of California, San Francisco.

Researchers reviewed data from the Spine Patients Outcomes Research Trial (SPORT) of 1,235 patients diagnosed with DS or SS. Patient responses to the question, “In the past week, how has pain affected your sex life?” were used to determine sex-life relevance. Patients selecting the options, “unable to answer” or “does not apply to me,” were placed in the sex-life non-relevant (NR) group. Patients selecting other options were placed into the sex-life relevant (SLR) group. The mean age of patients in the NR and SLR groups were 68 years and 63 years, respectively. Seventy percent of patients were in the SLR group.

There was a higher association of being in the NR group for patients who were female or unmarried, or had a coexisting joint problem or hypertension. At baseline, 40% of SLR patients reported having some level of pain related to sex.

The study included 825 patients, 449 with SS and 376 with DS. A total of 294 patients received nonoperative treatment, and 531 received surgical treatment. The nonoperative patients were more likely to report pain related to sex at all follow-up time frames (from 41% compared to 20%). The percentages remained constant during annual visits at 1 year, 2 years, 3 years, and 4 years after surgery. Prior studies found that 41% of physicians routinely question patients with lumbar disc herniation about sexual problems.

“Our current research has two important findings,” said Dr. Horst. “The first is that sexual activity and sexual function is an important consideration for patients with degenerative spine conditions. The study also shows that sexual function is a more relevant consideration for patients who are married, younger, and male. The second important finding of our study is that patients with degenerative conditions of the spine treated with surgery reported less pain with their sex life compared to patients treated without surgery. This finding lasted throughout the four years of follow-up.”

LAS VEGAS—Chronic low back pain can limit everyday activities, including sex. New research presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS) found that 70% of patients consider sexual activity “relevant” to their quality of life, and patients who receive surgical treatment for spinal degenerative spondylolisthesis (DS) and spinal stenosis (SS) were twice as likely to report no pain during sex.

“Our current research sheds light on the effect that spinal surgery has on a patient’s sex life and begins to describe the impact spinal disease has on this very important aspect of life,” said senior study author Shane Burch, MD, an orthopedic surgeon at the University of California, San Francisco.

Researchers reviewed data from the Spine Patients Outcomes Research Trial (SPORT) of 1,235 patients diagnosed with DS or SS. Patient responses to the question, “In the past week, how has pain affected your sex life?” were used to determine sex-life relevance. Patients selecting the options, “unable to answer” or “does not apply to me,” were placed in the sex-life non-relevant (NR) group. Patients selecting other options were placed into the sex-life relevant (SLR) group. The mean age of patients in the NR and SLR groups were 68 years and 63 years, respectively. Seventy percent of patients were in the SLR group.

There was a higher association of being in the NR group for patients who were female or unmarried, or had a coexisting joint problem or hypertension. At baseline, 40% of SLR patients reported having some level of pain related to sex.

The study included 825 patients, 449 with SS and 376 with DS. A total of 294 patients received nonoperative treatment, and 531 received surgical treatment. The nonoperative patients were more likely to report pain related to sex at all follow-up time frames (from 41% compared to 20%). The percentages remained constant during annual visits at 1 year, 2 years, 3 years, and 4 years after surgery. Prior studies found that 41% of physicians routinely question patients with lumbar disc herniation about sexual problems.

“Our current research has two important findings,” said Dr. Horst. “The first is that sexual activity and sexual function is an important consideration for patients with degenerative spine conditions. The study also shows that sexual function is a more relevant consideration for patients who are married, younger, and male. The second important finding of our study is that patients with degenerative conditions of the spine treated with surgery reported less pain with their sex life compared to patients treated without surgery. This finding lasted throughout the four years of follow-up.”

LAS VEGAS—Chronic low back pain can limit everyday activities, including sex. New research presented at the 2015 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS) found that 70% of patients consider sexual activity “relevant” to their quality of life, and patients who receive surgical treatment for spinal degenerative spondylolisthesis (DS) and spinal stenosis (SS) were twice as likely to report no pain during sex.

“Our current research sheds light on the effect that spinal surgery has on a patient’s sex life and begins to describe the impact spinal disease has on this very important aspect of life,” said senior study author Shane Burch, MD, an orthopedic surgeon at the University of California, San Francisco.

Researchers reviewed data from the Spine Patients Outcomes Research Trial (SPORT) of 1,235 patients diagnosed with DS or SS. Patient responses to the question, “In the past week, how has pain affected your sex life?” were used to determine sex-life relevance. Patients selecting the options, “unable to answer” or “does not apply to me,” were placed in the sex-life non-relevant (NR) group. Patients selecting other options were placed into the sex-life relevant (SLR) group. The mean age of patients in the NR and SLR groups were 68 years and 63 years, respectively. Seventy percent of patients were in the SLR group.

There was a higher association of being in the NR group for patients who were female or unmarried, or had a coexisting joint problem or hypertension. At baseline, 40% of SLR patients reported having some level of pain related to sex.

The study included 825 patients, 449 with SS and 376 with DS. A total of 294 patients received nonoperative treatment, and 531 received surgical treatment. The nonoperative patients were more likely to report pain related to sex at all follow-up time frames (from 41% compared to 20%). The percentages remained constant during annual visits at 1 year, 2 years, 3 years, and 4 years after surgery. Prior studies found that 41% of physicians routinely question patients with lumbar disc herniation about sexual problems.

“Our current research has two important findings,” said Dr. Horst. “The first is that sexual activity and sexual function is an important consideration for patients with degenerative spine conditions. The study also shows that sexual function is a more relevant consideration for patients who are married, younger, and male. The second important finding of our study is that patients with degenerative conditions of the spine treated with surgery reported less pain with their sex life compared to patients treated without surgery. This finding lasted throughout the four years of follow-up.”