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Does Body Mass Index Decrease Over Time Among Patients Who Undergo Total Knee Arthroplasty Compared to Patients With
Timothy L Kahn1, Nimrod Snir2, Ran Schwarzkopf3
1University of California Irvine Medical Center, Orange, California.
The Journal of Arthroplasty
|January 1, 2016
Summary
Total knee arthroplasty (TKA) does not significantly impact weight change in osteoarthritis (OA) patients compared to those not receiving TKA. While TKA improves quality of life, it is not a sole solution for obesity management.
Area of Science:
- Orthopedics
- Metabolic Health
- Clinical Research
Background:
- Total knee arthroplasty (TKA) improves function and quality of life in osteoarthritis (OA) patients.
- The impact of TKA on weight loss remains uncertain, necessitating further investigation.
Purpose of the Study:
- To compare changes in body mass index (BMI) over six years in OA patients who underwent TKA versus those who did not.
- To analyze weight change trends in OA patients following TKA in relation to baseline BMI, gender, and age.
Main Methods:
- Utilized data from the Osteoarthritis Initiative, a prospective cohort study.
- Compared initial and final BMI, and weight change over 72 months between TKA (N=140) and non-TKA (N=697) OA patient groups.
- Conducted subgroup analyses based on initial BMI, gender, and age.
Main Results:
- No significant difference in weight change between the TKA and non-TKA groups over 72 months ( -0.763 kg vs +0.191 kg; P = .597).
- Subgroups of women and patients aged 51-60 who received TKA experienced greater weight gain compared to their non-TKA counterparts.
- Patients with TKA and over two years of follow-up also showed average weight gain.
Conclusions:
- TKA alone is not sufficient for obesity management, despite improvements in pain, function, and quality of life.
- Weight change following TKA is comparable to non-operative management in OA patients.
- Further strategies are needed to address obesity in OA patients undergoing TKA.