caa a22 4500 605459320 CHVBK 20210128100233.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s00167-014-2995-4 doi (NATIONALLICENCE)springer-10.1007/s00167-014-2995-4 Associations of isokinetic knee steadiness with hop performance in patients with ACL deficiency [Elektronische Daten] [Yong-Hao Pua, Peck-Hoon Ong, Jia-Ying Ho, Adam Bryant, Kate E Webster, Ross Clark] Purpose: Contrary to the ample data available regarding the functional significance of isokinetic knee strength in patients with anterior cruciate ligament deficiency (ACLD), much less is known about the functional significance of isokinetic knee steadiness. This cross-sectional study aimed to evaluate, in patients with ACLD, the independent impact of isokinetic quadriceps and hamstrings torque steadiness on single-leg hop performance. Methods: Eighty-seven patients with unilateral ACLD participated. Patients performed isokinetic quadriceps and hamstrings steadiness and strength testing at 60°/s on an isokinetic dynamometer. Muscle steadiness and strength were represented by the wavelet-derived mean instantaneous frequency and peak value of the torque-time curves, respectively. To measure hop performance, patients performed a single-leg hop for distance and a 6-m single-leg hop for velocity. Results: One of two patients [n=45 (51%)] had a 10% or greater difference in knee torque frequency levels between the ACLD and contralateral knees. In multivariable models adjusted for age, sex, knee pain, and knee strength, hamstrings steadiness was significantly related with hop velocity whilst quadriceps steadiness was significantly related with both hop distance and velocity. Variance decomposition analyses suggested that quadriceps steadiness was similar in importance to hamstrings strength on hop distance and velocity. Conclusions: In patients with ACLD, isokinetic knee steadiness deficits were common and were independently associated with single-leg hop performance. Knee torque steadiness—a heretofore understudied variable—may prove a useful adjunct to conventional peak torque measurements by offering additional information to researchers and rehabilitation professionals about muscle performance and neuromuscular knee control. Level of evidence: Prognostic studies, Level III. Springer-Verlag Berlin Heidelberg, 2014 Force control nationallicence Isokinetics nationallicence Knee nationallicence ACL deficiency nationallicence Single-leg hop test nationallicence Pua Yong-Hao Department of Physiotherapy, Singapore General Hospital, Outram Road, 169608, Singapore, Singapore aut Ong Peck-Hoon Department of Physiotherapy, Singapore General Hospital, Outram Road, 169608, Singapore, Singapore aut Ho Jia-Ying Department of Physiotherapy, Singapore General Hospital, Outram Road, 169608, Singapore, Singapore aut Bryant Adam Department of Physiotherapy, The University of Melbourne, Melbourne, Australia aut E Webster Kate School of Health Sciences Research, La Trobe University, Melbourne, Australia aut Clark Ross School of Exercise Science, Australian Catholic University, Melbourne, Australia aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/8(2015-08-01), 2185-2195 0942-2056 23:8<2185 2015 23 167 https://doi.org/10.1007/s00167-014-2995-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-014-2995-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pua Yong-Hao Department of Physiotherapy, Singapore General Hospital, Outram Road, 169608, Singapore, Singapore aut NATIONALLICENCE 700 1- Ong Peck-Hoon Department of Physiotherapy, Singapore General Hospital, Outram Road, 169608, Singapore, Singapore aut NATIONALLICENCE 700 1- Ho Jia-Ying Department of Physiotherapy, Singapore General Hospital, Outram Road, 169608, Singapore, Singapore aut NATIONALLICENCE 700 1- Bryant Adam Department of Physiotherapy, The University of Melbourne, Melbourne, Australia aut NATIONALLICENCE 700 1- E Webster Kate School of Health Sciences Research, La Trobe University, Melbourne, Australia aut NATIONALLICENCE 700 1- Clark Ross School of Exercise Science, Australian Catholic University, Melbourne, Australia aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/8(2015-08-01), 2185-2195 0942-2056 23:8<2185 2015 23 167