Long-Term Effects of Obesity on Knee Joint ReplacementThis is the first study to report the long-term results of total knee replacement (TKR) in obese patients after more than 10 years. Other studies have followed patients for shorter periods of time. Researchers compared two groups of patients with TKR. One group had a body mass index greater than 30, which means they were obese. The control group had the same TKR, but these patients were not overweight.
A special computer program was used to match patients from each group. The patients were paired based on gender, age at the time of surgery, type of arthritis, and length of follow-up after surgery. Level of activity after TKR was also measured for each patient.
The researchers reported the following findings:
The authors conclude that obesity may increase a patient's chances of implant loosening. Higher loads at the spot where the implant meets the bone can be a problem. Having the patient lose weight before getting a TKR--and keeping it off--may be a good idea.
Jared R. H. Foran, BA, et al. Total Knee Arthroplasty in Obese Patients: A Comparison with a Matched Control Group. In The Journal of Arthroplasty. October 2004. Vol. 19. No. 7. Pp. 817-824.
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