JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Functional outcome of patients with rotationplasty about the knee.

Rotationplasty is a surgical procedure designed to achieve a durable reconstruction after the resection of tumors about the knee. However, because of the recent advances with expandable prostheses, rotationplasty has been less popular in the skeletally immature patient, particularly in the United States. We assessed the functional outcome of patients who had rotationplasty to allow better comparison with other operative techniques in this patient population. Seven patients, who were operated on at our institution at an average age of 9.4 years (range, 5-14 years), had a followup of at least 4 years and were evaluated in the Motion Analysis Laboratory. The gait analysis included kinetic, kinematic and temporal-distance parameters to evaluate the patient's functional performance. The data also were compared with measurements of a population of 25 able-bodied subjects and with four subjects with distal above-knee amputation. All patients had the ability to weightbear fully. All patients ambulated without assistive devices. Gait analysis of patients with rotationplasty revealed only slight asymmetry regarding stride duration, stride length, cadence, velocity and stance-swing ratio compared with healthy subjects. Although the gait was similar to subjects with distal above-knee amputation, knee motion was superior in patients who had rotationplasty. Rotationplasty offers a durable reconstruction. Rotationplasty allows the patient to actively control the knee, which results in a coordinated gait pattern, which is similar to the gait of the able-bodied population, and better than in subjects with distal-knee amputation.

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