Investigation performed at the UPMC Center for Sports Medicine, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania
A good anterior cruciate ligament injury-prevention program should:
➤ Incorporate feedback on technique
➤ Be performed throughout the year
➤ Focus on flexibility, strengthening, and plyometrics
The notch-width index (NWI) is determined by dividing the width of the intercondylar notch at the level of the popliteal groove by the bicondylar width at the same level, measured on a 45° flexion weight-bearing posteroanterior radiograph. A narrow NWI is defined as <0.2. Fig. 1-A represents a normal notch width (NWI = 0.23). Fig. 1-B represents a narrow notch width (NWI = 0.19). Both lines are generally measured at the same height (popliteal groove). They are offset here for illustrative purposes.
To determine the posterior tibial slope, a line is drawn down the longitudinal axis of the tibia on a true lateral radiograph. Then a line is drawn from the peak anterior and posterior points on the medial tibial plateau. The posterior tibial slope is defined as the angle between the line joining the tibial plateau and the line perpendicular to the longitudinal axis.
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