Motor recovery after arthroscopic partial meniscectomy. Analyses of gait and the ascent and descent of stairs.

We studied motor recovery as shown by locomotor activities after arthroscopic partial medial meniscectomies in seventeen men who were twenty-five to forty-nine years old. The patients were evaluated before the operation and two, four, and eight weeks after the operation. Control values were obtained from twenty-two healthy men whose ages, weights, and heights were similar to those of the patients who had had a meniscectomy. Motion of the hip, knee, and ankle in the sagittal plane and the electromyographic activities (as measured with surface electrodes) in five muscles were recorded while each subject walked on a level walkway and then ascended and descended stairs at free speeds. The results showed that meniscal tears affect the motor-control mechanisms involved in the submaximum locomotor activities that were studied and that these abnormalities may persist for as long as eight weeks after a meniscectomy.