Comparison of knee flexor strength recovery between semitendinosus alone versus semitendinosus with gracilis autograft for ACL reconstruction: a systematic review and meta-analysis oleh Angelo Matteucci, Johan Högberg, Ramana Piussi, Mathias Wernbom, Edoardo Franceschetti, Umile Giuseppe Longo, Kristian Samuelsson, Johan Lövgren, Eric Hamrin Senorski