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Range of Motion of Standard and High-Flexion Posterior Cruciate-Retaining Total Knee Prostheses^*

A Prospective Randomized Study

¹ The Joint Replacement Center of Korea at Ewha Womans University MokDong Hospital, 911-1, MokDong, YangCheon-Gu, Seoul 158-710, South Korea. E-mail address for Y.-H. Kim: younghookim{at}ewha.ac.kr

Investigation performed at The Joint Replacement Center of Korea at Ewha Womans University MokDong Hospital, Seoul, South Korea

^* Read in part at the Annual Meeting of the American Academy of Orthopaedic Surgeons, Las Vegas, Nevada, February 26, 2009.

Disclosure: The authors did not receive any outside funding or grants in support of their research for or preparation of this work. Neither they nor a member of their immediate families received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, division, center, clinical practice, or other charitable or nonprofit organization with which the authors, or a member of their immediate families, are affiliated or associated.

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Methods: Fifty-four patients (mean age, 69.7 years) received a standard posterior cruciate-retaining total knee prosthesis in one knee and a high-flexion posterior cruciate-retaining total knee prosthesis in the contralateral knee. Five patients were men, and forty-nine were women. At a mean of three years postoperatively, the patients were assessed clinically and radiographically with the knee-rating systems of the Knee Society and the Hospital for Special Surgery and with the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score.

Results: The mean postoperative Knee Society and Hospital for Special Surgery knee scores were 93.7 and 89 points, respectively, for the knees with a standard posterior cruciate-retaining prosthesis, and they were 93.9 and 90 points, respectively, for the knees with a high-flexion posterior cruciate-retaining prosthesis. The mean postoperative WOMAC score was 22 points. Postoperatively, the mean ranges of motion without and with weight-bearing were 131° (range, 90° to 150°) and 115° (range, 75° to 145°), respectively, in the knees with a standard prosthesis and 133° (range, 90° to 150°) and 118° (range, 75° to 145°), respectively, in those with a high-flexion prosthesis. Patient satisfaction and radiographic results were similar in the two groups. No knee had aseptic loosening, revision, or osteolysis.

Conclusions: After a minimum duration of follow-up of three years, we found no significant differences between the two groups with regard to the range of knee motion or the clinical or radiographic parameters.

Level of Evidence: Therapeutic Level I. See Instructions to Authors for a complete description of levels of evidence.

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