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Gender-Specific Knee Implants May Have No Benefits

Short-term results show little difference between standard, gender-specific models for women

THURSDAY, Sept. 2 (HealthDay News) -- Gender-specific posterior cruciate-substituting high-flexion knee prostheses don't appear to have any clinical advantages over standard models, at least in the short term, according to research published in the Aug. 18 issue of the Journal of Bone & Joint Surgery.

Young-Hoo Kim, M.D., of the Ewha Womans University MokDong Hospital in Seoul, South Korea, and colleagues studied clinical and radiographic results and femoral component fit in 85 women who received a standard LPS-Flex prosthesis in one knee and a gender-specific LPS-Flex prosthesis in the other. They followed the women for a mean of 2.5 years.

The researchers found that the Knee Society scores and Hospital for Special Surgery knee scores were similar in the standard and gender-specific groups, at 95.5 versus 96.5 and 90.7 versus 91.2, respectively; the mean Western Ontario and McMaster Universities Osteoarthritis score was 36.6 in the standard group and 35.7 in the gender-specific group. Mean ranges of knee motion, patient satisfaction, and radiographic results were close between the two groups. The standard group had a significantly better femoral component fit.

"The present study did not show any clinical benefits of a gender-specific LPS-Flex total knee prosthesis at the time of short-term follow-up. Longer follow-up is needed to determine whether there will be an advantage in terms of longer-term function," the authors write.

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