V-Y quadricepsplasty for hyperextension contracture of the knee. A, Detachment of rectus femoris tendon from muscle of rectus femoris, vastus medialis, and vastus lateralis muscles; vastus medialis and lateralis muscles are separated from iliotibial band, lateral hamstrings, medial hamstrings, and sartorius muscles. B, When knee is flexed, hamstring muscles and tensor fascia lata slip posterior to knee axis, restoring normal function. Quadriceps muscles are repaired in lengthened position.