Original ArticlesComparison of weight changes after total hip or knee arthroplasty*,**
Section snippets
Materials and methods
A prospective study of 192 patients undergoing either TKA (68 knees) or THA (124 hips) was carried out. The preoperative weight for each group was compared with the weight at 1 year postoperatively, and the change in weight was then calculated for each patient. The change in weight at 1 year was analyzed statistically using the nonparametric Student's t-test.
Results
A total of 192 patients underwent THA or TKA. Of these patients, 68 were TKAs, and 124 were THAs. There were 40 women and 28 men in the TKA group. There were 78 women and 46 men in the THA group. The average age of patients undergoing TKA was 71 years; the average age for women was 71 years and for men was 70 years (range: 54-89 years for women; 34-86 years for men). The average age for patients undergoing THA was 68 years; the average age for women was 69 years and for men was 66 years (range:
Discussion
When asked to lose weight preoperatively, patients argue that limited mobility affects their ability to lose weight. In this study, although the numbers are small, it appears that TKA has little effect on a patient's weight 1 year after surgery. Although the average weight change was minimal, 4 of the patients lost a relatively large amount of weight, which may have biased this average. Patients who lost weight represented the minority. The results suggest that patients gain weight after
Conclusion
This study suggests that patients do not lose weight after TKA or THA and that women undergoing THA gain weight at 1 year. This study provides evidence against the argument that immobility is the only limiting factor in preventing weight loss preoperatively. This is useful information for surgeons whose patients need encouragement to lose weight preoperatively.
References (3)
- et al.
Patient characteristics that affect the outcome of total hip arthroplasty: a review
Can J Surg
(1998)
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No benefits or funds were received in support of this study.
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Reprint requests: M. J. Woodruff, FRCS(Ed), 6 Woodbridge Avenue, Garforth, Leeds, LS25 2PJ UK.