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Orthopedic Service, Keller Army Hospital
Department of Geography and Computer Sciences, United States Military Academy, West Point, New York
Department of Geography and Computer Sciences, United States Military Academy, West Point, New York
Gem City Bone and Joint Clinic, PC, Laramie, Wyoming
Although the intercondylar notch becomes narrowed with a failed repair of the ACL or with chronic instability of the knee, narrowed intercondylar notches have fre quently been observed during arthrotomy for an acute ACL tear in previously uninjured knees. In order to determine whether the structure of the intercondylar notch predisposes a knee to anterior cruciate tears, a computer graphics study was designed. Notch view roentgenograms of 50 patients with an acute ACL injury and 50 "normal" patients without history of significant knee injury were compared. An interactive graphics design station was used to obtain the area of the anterior opening (ANT) and posterior arch (POST) of the intercondylar notch. A "total" (TOTAL) area was obtained by tracing the distal 7.5 cm of the femur. Only the ratios of areas obtained from each roentgenogram were used for comparison because of varying femur sizes among patients and possible slightly varying tech niques of taking the notch view roentgenogram itself. The following ratios were developed: ANT/POST, POST/TOTAL, and (POST-ANT)/TOTAL. The differ ence between the means of the ratio POST/TOTAL for knees with acute ACL tears and those for normal knees was statistically significant (P < 0.005). This study suggests that a narrowed posterior arch of the inter condylar notch may predispose a knee to ACL tear.
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