Table 1.

Inclusion and exclusion criteria. Abbreviation: MPFLR, medial patellofemoral ligament reconstruction; TTO: tibial tubercle osteotomy

Inclusion criteria	Exclusion criteria
Studies including patients treated with MPFLR or MPFLR combined with TTT for patellar instability	Studies including patients treated with Trochlea plasty
Studies reporting preoperative constitutions and post-operative clinical outcomes or re-dislocation after operative treatment for patellar instability	Studies including patients treated with other surgery treatments for patellar instability
Human studies	Studies that did not report both preoperative constitutions and post-operative clinical outcomes or re-dislocation after operative treatment for patellar instability
Level I–IV evidence	Non-human studies
	Level V evidence, review articles, technical notes, current concept articles, experimental, laboratory studies, case reports