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  • Title: Abnormal lateral notch in knees with anterior cruciate ligament injury.
    Author: Nakauchi M, Kurosawa H, Kawakami A.
    Journal: J Orthop Sci; 2000; 5(2):92-5. PubMed ID: 10982640.
    Abstract:
    We reviewed plain radiograms of anterior cruciate ligament injuries to determine the frequency of an abnormal lateral notch found in the lateral femoral condyle, and we investigated a possible mechanism for its occurrence by determining the relationship with associated injuries. We analyzed data for 216 patients who underwent ACL reconstruction between 1993 and 1996, whose radiographic images of the contralateral knee were available. The numbers of male and female patients were 122 and 94, respectively, and their ages ranged from 14 to 47 years (average, 25 years). The abnormal notch visualized by lateral radiograph was found in 66 of 216 knees (30. 6%) and was classified into three types. The type of abnormal notch seen most frequently (73%) was located at the same site as the notch on the contralateral side, but appeared deeper than normal. Knees with abnormal notches showed lateral meniscal injuries more frequently than those without such notches (P<0.005). The abnormal notch was assumed to have formed at the time of injuries, after impingement of the lateral femoral condyle on the lateral tibial condyle. Cartilage damage at the abnormal notch should be carefully observed in the future.
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