Anterior cruciate ligament reconstruction and physiological joint laxity: earliest changes in joint stability and stiffness after reconstruction |
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Authors: | Hideo Matsumoto Takashi Toyoda Makoto Kawakubo Toshiro Otani Yasunori Suda Kyosuke Fujikawa |
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Institution: | (1) Department of Orthopaedic Surgery, Keio University School of Medicine, 36 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan, JP;(2) Department of Orthopaedic Surgery, National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama 359, Japan, JP |
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Abstract: | Physiological joint laxity is an important element of normal knee joint function, providing smooth joint movement. However,
the objective evaluation of post-operative results after knee ligament surgery is usually based primarily on stability and
range of motion, and joint laxity has been ignored. In this study, we measured the joint stiffness of 82 knees undergoing
anterior cruciate ligament (ACL) reconstruction with the Leeds-Keio artificial ligament, before the operation, immediately
after the operation, and finally when the full range of motion was achieved postoperatively; changes in joint laxity after
the ACL reconstruction were investigated. Before the operation, joint laxity was greater than that of the normal side (P < 0.01), but immediately after the operation it diminished compared not only with that observed preoperatively, but also
with that of the normal side. When the full range of motion was achieved, joint laxity was lower than that observed immediately
after the operation (P < 0.01), but still remained higher than that of the normal side (P < 0.01). In other words, stability was achieved, but joint laxity was diminished through the operation. In this series, a
stiffer artificial ligament than the natural ACL was used, and maximum tension was applied during the operation, aiming at
better stability, but this may cause diminution of joint laxity.
Received for publication on Sept. 1998; accepted on Dec. 2, 1998 |
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Keywords: | : Anterior cruciate ligament (ACL) reconstruction stability laxity ACL reconstruction and joint laxity |
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