Fig. 4From: Knee extension contracture with fixed anterior tibia subluxation treated with PCL release and quadricepsplasty: a case reportFixed anterior tibial subluxation with incorrect joint congruence, resulting in abnormal “hinge-like movement” (A1,B1). Compression of posterior part of the knee and anterior joint opening could be seen during each attempt of knee flexion (A2,B2)Back to article page