Twelve subjects (6 cases of and 6 cases of Achilles' tendon rupture anterior. talofibular ligament rupture) were studied on the muscle power of the femur with a Cybex II dynamometer (Lumex Inc., New York) at four weeks and eight weeks of postoperative muscle training. The muscle power reduction of the knee extensors was greater than that of the knee flexors. Probably the greater distribution of type II (FT) fibers of the knee extensors may affect this muscle power reduction.
