“Posterior drawer” often is mistaken for “anterior drawer” because tibia sags posteriorly and appears to move abnormal distance forward when examiner tests for anterior drawer phenomenon. A, “Posterior sag” of right tibia is obvious compared with normal silhouette of healthy knee joint. B, Tibial sag in resting position. If patient starts to raise the foot from this position, pull of quadriceps first displaces tibia anteriorly into neutral position until anterior cruciate ligament is tight (C). Only then is foot raised from table (D). ER, External rotation; IR, internal rotation; NR, neutral rotation.