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Merchant's patellar congruence angle (BÂC). Line C bisects the angle DÂE, which is the angle of the trochlear sulcus. Line B joins the vertex of the angle DÂE to the lowest point of the patellar crest. BÂC = +4.7° in the normal knee and BÂC = +13.2° in the left knee with an anterior cruciate ligament injury.
