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Fowler 
Kennedy Sport Medicine Clinic, 3M Centre, University of Western Ontario, London, Ontario, Canada
Presented at the 63rd annual meeting of the AAOS in Atlanta, Georgia, February 1996, and the annual meeting of The Canadian Orthopaedic Association, Hamilton, Ontario, Canada, June 1997.
Address correspondence and reprint requests to Peter J. Fowler, MD, FRCS(C), FowlerKennedy Sport Medicine Clinic, 3M Centre, University of Western Ontario, London, Ontario N6A 3K7, Canada
Twenty-three patients with acute anterior cruciate ligament injuries, normal radiographs, and occult osteochondral lesions revealed by magnetic resonance imaging were reviewed 6 years after initial injury and anterior cruciate ligament hamstring autograft reconstruction. Each patient completed the Mohtadi Quality of Life outcome measure for anterior cruciate ligament deficiency, underwent clinical examination, and had a repeat magnetic resonance imaging scan. The index and follow-up magnetic resonance imaging scans were compared with respect to cartilage thinning and marrow signal. A significant number of patients had evidence of cartilage thinning adjacent to the site of the initial osteochondral lesion. Marrow signal changes persisted in 15 (65%) of the patients. Clinical comparison of patients with normal cartilage with those who had cartilage thinning revealed similar results on both KT-1000 arthrometry and on the Mohtadi outcome measure. This suggests that the initial injury resulted in irreversible changes in the knee. Injuries causing marrow signal changes may result in an alteration in the load-bearing properties of subchondral bone, which in turn allow for changes in the overlying cartilage. Further follow-up will determine the clinical significance of changes detected by magnetic resonance imaging.
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