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The American Journal of Sports Medicine 25:191-195 (1997)
© 1997 SAGE Publications

The Relationship Between Passive Joint Laxity and Functional Outcome After Anterior Cruciate Ligament Injury

Lynn Snyder-Mackler, ScD, PT

Department of Physical Therapy, University of Delaware, Newark, Delaware, Department of Physical Therapy, Allegheny University of the Health Sciences, Philadelphia, The Rothman Institute and Thomas Jefferson University, Department of Orthopaedics, Philadelphia, Pennsylvania

G. Kelley Fitzgerald, MS, PT, OCS

Department of Physical Therapy, Allegheny University of the Health Sciences, Philadelphia

Arthur R. Bartolozzi, III, MD

The Rothman Institute and Thomas Jefferson University, Department of Orthopaedics, Philadelphia, Pennsylvania

Michael G. Ciccotti, MD

The Rothman Institute and Thomas Jefferson University, Department of Orthopaedics, Philadelphia, Pennsylvania

Twenty patients with anterior cruciate ligament-defi cient knees were studied. Ten patients returned to all sports activities (compensators) and 10 patients were not improved with nonoperative management and re quired surgical stabilization (noncompensators). Joint laxity was measured using a KT-2000 arthrometer (manual maximum Lachman). Subjects completed a Lysholm questionnaire and Knee Outcome Score. The International Knee Documentation Committee form was also completed. Patients also rated their knee function on a scale of 1 to 100. There was no difference in level and frequency of athletic activity between the two groups before their anterior cruciate ligament inju ries as determined by the knee outcome score. The compensator group had a mean side-to-side difference of 3.25 mm at 89 N and the noncompensators had a mean difference of 3 mm preoperatively. Manual max imum tests gave side-to-side differences of 6.7 mm for the compensators and 6 mm for the noncompensators. There were no differences in laxity measures between groups. The correlation between knee outcome scores and side-to-side laxity measurements were not signif icant. Measurements of anterior laxity in anterior cru ciate ligament-deficient patients were not correlated with measures of functional outcome used in this study. Functional outcome measurements that are par tially based on joint laxity measures, such as the Inter national Knee Documentation Committee form, may artificially overestimate the disability after anterior cru ciate ligament rupture.




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Copyright © 1997 by the American Orthopaedic Society for Sports Medicine.