Patellar instability is highly represented in adolescent patients. For a group of patients with patellar instability, isolated medial patellofemoral ligament reconstruction (MPFLR) is a standard treatment option. Although gracilis tendon (GRT) autograft has been frequently used, the optimal surgical approach and graft source for this procedure is yet to be established. The use of plantaris tendon (PLT) autograft in isolated MPFLR has never been compared to GRT autograft. The purpose of this study is to determine whether a four-folded PLT autograft used for isolated anatomic MPFLR in adolescent patients restores patellar stability
