Muscle strength and functional performance is markedly impaired at the recommended time point for sport return after anterior cruciate ligament reconstruction in recreational athletes |
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| Affiliation: | 1. University of Belgrade, Institute for Medical Research, Department of Neurophysiology, Belgrade, Serbia;2. University of Belgrade, Faculty of Sport and Physical Education, The Research Centre, Belgrade, Serbia;3. Clinical Centre of Serbia, Institute for Orthopaedic Surgery and Traumatology, Belgrade, Serbia;4. University of Delaware, Department of Kinesiology and Applied Physiology, Newark, DE, USA;5. University of Delaware, Biomechanics and Movement Science Graduate Program, Newark, DE, USA;1. Department of Orthopaedic Surgery, KonKuk University Medical Center, Seoul, South Korea;2. Sports Medical Center, KonKuk University Medical Center, Seoul, South Korea |
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| Abstract: | PurposeTo examine potential deficits in muscle strength or functional capacity when comparing (1) an ACL reconstructed group to matched healthy controls, (2) the ACL reconstructed leg to the non-injured leg and (3) the non-injured leg to matched healthy controls, at the time-point of recommended sport return 9–12 months post-surgery.MethodsSixteen patients (male-female ratio: 9:7) 9–12 months post ACL reconstruction and sixteen age and sex matched healthy controls were included. Outcome measures included maximal knee extensor (KE) and knee flexor (KF) dynamometry, including measurement of rate of force development, functional capacity (counter movement jump (CMJ) and single distance hop (SDH)) and the Lysholm score.ResultsCompared to the control group, maximal KE and KF muscle strength were impaired in the ACL reconstructed leg by 27–39% and 16–35%, respectively (p < .001). Also, impairments of both CMJ (38%) and SDH (33%) were observed (p < .001). Rate of force development for KE were reduced in the ACL group compared to the control group (p < .001). Similarly, the KE and KF muscle strength, CMJ and SDH of the ACL reconstructed leg were impaired, when compared to the non-injured leg by 15–23%, 8–20%, 23% and 20%, respectively (p < .05).ConclusionMuscle strength and functional capacity are markedly impaired in the ACL reconstructed leg of recreationally active people 9–12 months post-surgery when compared to healthy matched controls and to their non-injured leg. This suggests that objective criteria rather than “time-since-surgery” criteria should guide return to sport. |
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| Keywords: | Eccentric Isometric and concentric muscle strength Rate of force development Control group |
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