Eight patients treated with total knee reconstruction and tumor resection surgery were evaluated using quantitative gait analysis. Histological diagnosis included: three patients with osteosarcoma, two with chondrosarcoma, two with giant cell tumor (GCT) and one primitive neuroectodermal tumor (PNET). The most frequent tunor location was the distal femur for six patients. Seven cases were reconstructed using Kotz's prosthesis and the remaining case using a long stem ceramic prosthesis. The mean follow-up period for clinical evaluation was 44 months (range: 9 to 106). Postoperative function was evaluated according to Enneking's criteria. A comparison of the operated and non-operated limbs was made using a ratio of the following characteristic points from gait analysis: vertical component (Fz), fore-aft component (Fy) and stance time.
The functional evaluation was rated excellent in one, good in four, fair in two and poor in one, scoring 24.6 points (range: 17 to 33) out of maximum of 35 points. In the six cases in which the quadriceps muscle group (quads) were resected, the average ratio of stance time was 82.8%, however in the two cases in which quads were preserved, the stance time ratio were 101.7% and 91.2%. Similar trends were observed for the Fz impulse and deceleration and acceleration impulse phase of Fy. However there was no significant correlation between the gait analysis parameters and the functional evaluation after surgery.
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