Structure and attachments of posterior cruciate ligament. A, Lateral surface of medial condyle of femur showing average measurements and relationships of femoral attachment of posterior cruciate ligament (shaded area). B, Change in shape and tension of posterior cruciate ligament components in extension and flexion. With flexion, there is tightening of bulk of ligament (BB′) but less tension on small band (AA′). CC′, Ligament of Humphry attached to lateral meniscus.