Clinical Report: Muscle recovery following knee arthroplasty
Overview
This study evaluates quadriceps and hamstring strength and flexibility in patients undergoing total knee arthroplasty (TKA). Strength deficits persist compared to healthy controls over 12 months.
Background
Total knee arthroplasty is a common surgical intervention for severe knee osteoarthritis, aimed at improving function and reducing pain. Postoperative rehabilitation is critical for recovery, yet many patients experience persistent muscle strength deficits.
Data Highlights
Time Point
Quadriceps Strength (lbs)
Hamstring Strength (lbs)
Preoperative
12
20
6 Weeks
7
13
3 Months
30
30
6 Months
38
42
12 Months
43
58
Key Findings
Quadriceps strength decreased from 12 lbs preoperatively to 7 lbs at 6 weeks.
Hamstring strength decreased from 20 lbs preoperatively to 13 lbs at 6 weeks.
At 12 months, quadriceps strength was 43 lbs and hamstring strength was 58 lbs, both lower than control values.
Longitudinal changes were assessed using repeated-measures analysis of variance.
Attrition at 12 months may limit the generalizability of the findings.
Clinical Implications
The findings indicate that patients experience recovery in muscle strength post-TKA, but significant deficits remain compared to healthy individuals.
Conclusion
The study emphasizes the importance of ongoing evaluation of muscle recovery following TKA.
Researchers urge caution in interpreting joint replacement predictors, noting that surgery reflects access and decision-making as well as disease biology.
Joint tenderness showed broader associations with concurrent ultrasound abnormalities than patient-reported pain among anti-cyclic citrullinated peptide–positive patients without clinical arthritis.
