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Background After anterior cruciate ligament reconstruction (ACLR), jump tests allow return to sport decision making and may help assessing anterior cruciate ligament injury iterative risk. Objective The main objective was to examine countermovement jump (CMJ) measures to identify which parameters can best distinguish between ACLR and control participants. The secondary objective was to determine whether performance alterations between operated and non-operated limb exist during CMJ after ACLR. Design Non randomized, single blinded, prospective case control study Setting Clinical study Patients This study included 67 patients (ACLR group) with hamstring graft and no contact injury at 6 postoperative months and 47 healthy athletes (control group) with no knee injury history. Interventions Participants were performed 3 CMJ. The best performance was kept for the analysis, while landing on the force plate. Main Outcome Measurements The evaluation of CMJ by force plate was performed to calculate limb symmetry index (LSI) for vertical ground reaction force (vGRF), maximal power (MP) and eccentric rate force development (RFDe) during landing. First analysis compared LSI vGRF, LSI MP and LSI RFDe between both groups. Secondary analysis compared vGRF, MP and RFDe between operated/non-operated limb in the ACLR group and dominant/non-dominant limb in the control group. Results At 6 postoperative months, CMJ measures in the ACLR group were significantly reduced compared to the control group for LSI vGRF (p Conclusions The results indicate significant alterations on the non-operated limb during CMJ. Landing and deceleration should be better considered at time to return to sport after ACLR.
Forelli et al. (Fri,) studied this question.