The long-term consequence of strength deficits after menisectomy

This study was undertaken to investigate the long-term effects of a muscular imbalance of the knee extensors of both legs, resulting from a menisectomy and a subsequent training program. Sixteen subjects were tested at the end of an eight-week training program and again 28 months later. At the end of the training program strength deficits of 13% (maximum isometric torque) and 28% (maximum isokinetic torque) were found. During the 28-month follow-up a significant increase in the mean isometric torque of the operated leg and the mean isokinetic torque of both legs was observed (p < 0.05). This resulted in a symmetrical maximum isometric and isokinetic torque of the knee extensors of both legs. A physical examination and an interview, which formed part of the 28-month follow-up, revealed no indications of knee injury or serious complaints resulting from the strength imbalance present at the end of the training program. It is concluded that the present study does not support the general opinion that a strength imbalance of the knee extensors of both legs will result in further injury to the knee joint. Secondly, it is suggested that the strength of the knee extensors of the operated leg may increase and symmetry may be reached even if the training program is ended and normal activities are resumed.