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Wednesday, February 28, 2001

Improved mental health not guaranteed for TKA patients

Patients who undergo total knee replacement (TKA) should be aware that their physical condition will improve, but they may not have an improvement in their mental status.

This finding are shown in a study reported in scientific exhibit 27.

Seventy patients were reviewed prospectively following cemented TKA. Preoperative and postoperative medical outcome study health survey questionnaires (SF-36) were compared preoperatively and postoperatively at yearly followups for five years. The physical component score (PCS) consists of physical functioning, physical role, bodily pain and general health. The mental component score (MCS) consists of vitality, social functioning, emotional role and mental health. The general U.S. population values (N-2474 of the SF-36) were referenced, as well.

The mean score for the PCS was 28.1 preoperatively, and 39.0 postoperatively, which is a standard deviation of 5.7 and 13.3, respectively. The MCS was 55.3 preoperatively and 54.1 postoperatively, which is a standard deviation of 13.7 and 10.7, respectively.

An improvement of 10.9 in the PCS represents an improvement in physical health great enough to change the percentile distribution score from 6 to 15 in the U.S. general population, the researchers said. Using the ANOVA analysis, the patients therefore improved significantly preoperatively to postoperatively. The MCS did not change significantly from a preoperative score of 55.3 to a postoperative score of 54.

The researchers are Mike Gross, MD; and Jack M. Bert, MD, St. Paul, Minn

Funding was provided by Wright Medical Technology, Arlington, Tenn.

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2001 Academy News February 28 Index B

Last modified 20/February/2001 by IS