A 6-year follow-up of the effect of graft site on strength, stability, range of motion, function, and joint degeneration after anterior cruciate ligament reconstruction: patellar tendon versus semitendinosus and gracilis tendon graft - Keays, S L; Bullock-Saxton, J E; Keays, A C; Newcombe, P A; Bullock, M I (Am J Sports Med, 2007)