Context Deficits in plyometric abilities are common after anterior cruciate ligament reconstruction (ACLR). Vertical rebound tasks may provide a targeted evaluation of knee function. Objective To examine the utility of a vertical hop test for assessing function after ACLR and establishing factors associated with performance. Design Cross-sectional study. Setting Rehabilitation program. Patients or Other Participants Soccer players with a history of ACLR (n = 73) and matched control individuals (n = 195). Main Outcome Measure(s) The 10-second vertical hop test provided measures of jump height, the Reactive Strength Index (RSI), and asymmetry. We also examined possible predictors of hop performance, including single-legged vertical drop jump, isokinetic knee-extension strength, and the International Knee Documentation Committee questionnaire score. Results Between-limbs differences were identified only for the ACLR group, and asymmetry scores increased in those with a history of ACLR (P < .001) compared with the control group. The single-legged vertical drop jump, RSI, and knee-extension torque were significant predictors of 10-second hop height (R2 = 20.1%) and RSI (R2 = 47.1%). Conclusions Vertical hop deficits were present after ACLR, even after participants completed a comprehensive rehabilitation program. This may have been due to reduced knee-extension and reactive strength. Vertical hop tests warrant inclusion as part of the return-to-sport test battery. Key Points - Compared with a matched control group, soccer players in the later stages of rehabilitation after anterior cruciate ligament reconstruction (ACLR) displayed lower-level performances and greater asymmetry in 10-second hop outcome measures. - Worse 10-second hop performance after ACLR may be attributed in part to residual deficits in knee-extension and reactive strength. - After ACLR, participants' asymmetry scores during the 10-second hop test were greater (by ~25%) than previous values suggested for acceptable discharge from rehabilitation in traditional horizontal hop tests (eg, >90% Limb Symmetry Index). Thus, vertical rebound tasks may be more sensitive in identifying deficits in knee function.
© Copyright 2023 Journal of Athletic Training. National Athletic Trainers' Association. Kaikki oikeudet pidätetään. / Kääntänyt https://www.DeepL.com/Translator