How Much Improvement in Patient Activity Can Be Expected After TKA?

Area of Science:

• Orthopedics
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Patients undergoing total knee arthroplasty (TKA) often anticipate enhanced physical activity levels post-surgery.
• Assessing the actual improvement in daily physical activity is crucial for patient outcomes and rehabilitation effectiveness.

Purpose of the Study:

• To quantitatively evaluate the improvement in physical activity after total knee arthroplasty (TKA).
• To determine the proportion of patients achieving health-enhancing physical activity (HEPA) guidelines and an active lifestyle post-TKA.

Main Methods:

• Utilized accelerometers to measure physical activity in 221 patients before and one year after TKA.
• Recorded daily steps and time spent in various activity states (lying, sitting/standing, walking).
• Applied established thresholds for health-enhancing physical activity (HEPA) guidelines and active lifestyle definitions.

Main Results:

• Mean daily steps increased from 5371 pre-TKA to 6587 one year post-TKA.
• Only 22.6% of patients met HEPA guidelines, while 31% achieved an active lifestyle.
• Improvements in step count were significantly influenced by patient age, body mass index (BMI), and preoperative activity levels.

Conclusions:

• Total knee arthroplasty (TKA) leads to measurable improvements in physical activity.
• A significant portion of patients do not reach recommended physical activity levels post-TKA.
• Patient-specific factors, including age, BMI, and baseline activity, are critical predictors of post-TKA physical activity.