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Long-term outcome following total knee arthroplasty: a controlled longitudinal study
J Cushnaghan1, J Bennett, I Reading
1MRC Epidemiology Resource Centre, Southampton General Hospital, Southampton, UK.
Annals of the Rheumatic Diseases
|July 31, 2008
Summary
Total knee arthroplasty (TKA) improves physical function for osteoarthritis patients long-term. Benefits are seen even in obese individuals, suggesting BMI should not prevent TKA.
Area of Science:
- Orthopedics
- Rheumatology
- Public Health
Background:
- Osteoarthritis significantly impacts physical function and quality of life.
- Total knee arthroplasty (TKA) is a common surgical intervention for advanced osteoarthritis.
- Long-term outcomes and prognostic factors after TKA require further investigation.
Purpose of the Study:
- To evaluate the sustained functional outcomes of TKA for osteoarthritis.
- To identify predictors of prognosis in patients undergoing TKA.
- To compare outcomes in TKA patients with a general population control group.
Main Methods:
- A longitudinal study followed 325 TKA patients and 363 general population controls for approximately 6 years.
- Baseline data included demographics, comorbidity, BMI, functional status, and radiographic osteoarthritis severity.
- Follow-up functional status was assessed via postal questionnaire, with analysis using linear regression.
Main Results:
- TKA patients showed a median 6-point improvement in SF-36 physical function, contrasting with a 14-point decline in controls (p<0.001).
- Obesity did not negate TKA benefits; obese TKA patients showed better physical function than obese controls.
- Older age and better baseline function predicted poorer functional changes in both groups.
Conclusions:
- Sustained improvements in physical function following TKA for osteoarthritis extend beyond 5 years.
- TKA provides significant benefits for both obese and non-obese patients.
- Obesity alone should not be a contraindication for TKA in osteoarthritis management.