HOME HELP CONTACT US SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:
Sign In to gain access to subscriptions and/or personal tools.

This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Permissions Request Reprints Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Inoue, M. Articles by Kaneda, K. Search for Related Content PubMed PubMed Citation Articles by Inoue, M. Articles by Kaneda, K. Related Collections Knee

Compensatory Muscle Activity in the Posterior Cruciate Ligament-Deficient Knee During Isokinetic Knee Motion

Masayuki Inoue, MD, Kazunori Yasuda, MD, PhD^,, Masatomo Yamanaka, RPT, Tatsuhiko Wada, PhD and Kiyoshi Kaneda, MD, PhD

Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
Department of Physical Therapy, College of Medical Technology, Hokkaido University, Sapporo, Japan

Presented at the 20th annual meeting of the AOSSM, Palm Desert, California, June 1994.

Address correspondence and reprint requests to Kazunori Yasuda, MD, PhD, Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Kita-15 Nishi-7, Kita-ku, Sapporo, 060, Japan

We performed electromyographic analyses in 12 patients with posterior cruciate ligament-deficient knees to compare electrical activity in the quadriceps, hamstring, and gastrocnemius muscles between the uninjured and involved limbs. Each patient performed concentric isokinetic knee motion at 30 and 60 deg/sec in both limbs separately. Torques in knee extension and flexion and surface electromyograms from the quadriceps, medial hamstring, and medial gastrocnemius muscles were simultaneously recorded. The uninjured limb served as a control for each patient. Before generation of flexion torque, the gastrocnemius muscle was electrically activated significantly earlier in posterior cruciate ligament-deficient knees than in uninjured knees at each velocity. However, we could not find any significant differences between the posterior cruciate ligament-deficient and uninjured knees in torque curves and electromyelograms of the quadriceps and hamstring muscles. This study suggests that early contraction of the gastrocnemius muscle may be a part of a compensatory mechanism in posterior cruciate ligament-deficient knees.

This article has been cited by other articles:

				C. A. Fontbote, T. C. Sell, K. G. Laudner, M. Haemmerle, C. R. Allen, F. Margheritini, S. M. Lephart, and C. D. Harner Neuromuscular and Biomechanical Adaptations of Patients With Isolated Deficiency of the Posterior Cruciate Ligament Am. J. Sports Med., July 1, 2005; 33(7): 982 - 989. [Abstract] [Full Text] [PDF]

				M. Inoue, K. Yasuda, E. Kondo, K. Saito, and M. Ishibe Primary Repair of Posterior Cruciate Ligament Avulsion Fracture: The Effect of Occult Injury in the Midsubstance on Postoperative Instability Am. J. Sports Med., July 1, 2004; 32(5): 1230 - 1237. [Abstract] [Full Text] [PDF]