Fig. 3

Pooled effect sizes of pre- to post-arthroscopy including Hip Outcome Score-Sport Scale (HOS-SS), Hip disability and Osteoarthritis Outcome Score-Function in Sport and Recreation (HOOS-SR), The Copenhagen Hip and Groin Outcome Score-Physical Function in Sport and Recreation (HAGOS-SR) and International Hip Outcome Tool-Sports and Recreational activities (iHOT-33 SR) at 6−12 months (a); 13−24 months post-arthroscopy (b) and ≥ 25 months (c), showing standard paired difference (SPD) and 95% confidence intervals (CI). Weightings relate to study size. Randomised controlled trials are indicated with *