RT Journal Article SR Electronic T1 Measuring only hop distance during single leg hop testing is insufficient to detect deficits in knee function after ACL reconstruction: a systematic review and meta-analysis JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 139 OP 153 DO 10.1136/bjsports-2018-099918 VO 54 IS 3 A1 Kotsifaki, Argyro A1 Korakakis, Vasileios A1 Whiteley, Rod A1 Van Rossom, Sam A1 Jonkers, Ilse YR 2020 UL http://bjsm.bmj.com/content/54/3/139.abstract AB Objective To systematically review the biomechanical deficits after ACL reconstruction (ACLR) during single leg hop for distance (SLHD) testing and report these differences compared with the contralateral leg and with healthy controls.Design Systematic review with meta-analysis.Data sources A systematic search in Pubmed (Ovid), EMBASE, CINAHL, Scopus, Web of Science, PEDro, SPORTDiscus, Cochrane Library, grey literature and trial registries, was conducted from inception to 1 April 2018.Eligibility criteria for selecting studies Studies reporting kinematic, kinetic and/or electromyographic data of the ACLR limb during SLHD with no language limits.Results The literature review yielded 1551 articles and 19 studies met the inclusion criteria. Meta-analysis revealed strong evidence of lower peak knee flexion angle and knee flexion moments during landing compared with the uninjured leg and with controls. Also, moderate evidence (with large effect size) of lower knee power absorption during landing compared with the uninjured leg. No difference was found in peak vertical ground reaction force during landing. Subgroup analyses revealed that some kinematic variables do not restore with time and may even worsen.Conclusion During SLHD several kinematic and kinetic deficits were detected between limbs after ACLR, despite adequate SLHD performance. Measuring only hop distance, even using the healthy leg as a reference, is insufficient to fully assess knee function after ACLR. PROSPERO trial registration number CRD42018087779.