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Department of Orthopedic Surgery and Rehabilitation, St. Thomas Hospital, Nashville, Tennessee
Department of Orthopedic Surgery and Rehabilitation, St. Thomas Hospital, Nashville, Tennessee
Department of Orthopedic Surgery and Rehabilitation, St. Thomas Hospital, Nashville, Tennessee
Department of Orthopedic Surgery and Rehabilitation, St. Thomas Hospital, Nashville, Tennessee
The purposes of this study were to document the dimensions and configuration of the intercondylar notch in the normal knee; to compare normal knee intercon dylar notches to those of knees with unilateral and bilateral ACL tears to determine if there is a relationship between intercondylar notch stenosis and ACL tears; and to determine if generalized ligamentous laxity is associated with intercondylar notch stenosis and ACL tears. Three groups were compared: Group I, bilateral ACL tears; Group II, unilateral tears; and Group III, normal knees. Notch dimensions were computer-gen erated from CT scans. All patients were examined for ligamentous laxity. Statistically significant differences were found between normal and ACL-injured knees in regard to opening notch angle, ratio of notch width at two-thirds of the notch length to condylar width, and ratio of maximum notch width to condylar width, sug gesting a significant association between anterior outlet stenosis and unilateral and bilateral ACL tears. The shapes of the notches were determined from tracings of the distal CT scan. Shapes ranged from inverted U to cresting wave. Narrow notches tended to be wave- shaped, but more study is needed in this area. Notch- plasty is recommended for those with documented stenosis. The ratio of maximum notch width at two- thirds of the notch height to maximum condyle width should not be much less than 0.2, and the opening notch angle should be at least 50°.
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