Experimentally Reduced Hip-Abductor Muscle Strength and Frontal-Plane Biomechanics During Walking

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Bibliographic Details
Title translated into German:Experimentell reduzierte Hüftbeugemuskulaturkraft und Biomechanik der Frontalebene während des Laufens
Author:Pohl, Michael B.; Kendall, Karen D.; Patel, Chirag; Wiley, J. Preston; Emery, Carolyn; Ferber, Reed
Published in:Journal of athletic training
Published:50 (2015), 4, S. 385-391, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Electronic resource (online) Print resource
Language:English
ISSN:1062-6050, 0160-8320, 1938-162X
Keywords:
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Identification number:PU201508006295
Source:BISp

Abstract

Context: Researchers have postulated that reduced hip-abductor muscle strength may have a role in the progression of knee osteoarthritis by increasing the external knee-adduction moment. However, the relationship between hip-abductor strength and frontal-plane biomechanics remains unclear. Objective: To experimentally reduce hip-abduction strength and observe the subsequent changes in frontal-plane biomechanics. Design: Descriptive laboratory study. Setting: Research laboratory. Patients or Other Participants: Eight healthy, recreationally active men (age = 27 ± 6 years, height = 1.75 ± 0.11 m, mass = 76.1 ± 10.0 kg). Intervention(s): All participants underwent a superior gluteal nerve block injection to reduce the force output of the hip-abductor muscle group. Main Outcome Measure(s): Maximal isometric hip-abduction strength and gait biomechanical data were collected before and after the injections. Gait biomechanical variables collected during walking consisted of knee- and hip-adduction moments and impulses and the peak angles of contralateral pelvic drop, hip adduction, and ipsilateral trunk lean. Results: Hip-abduction strength was reduced after the injection (P = .001) and remained lower than baseline values at the completion of the postinjection gait data collection (P = .02). No alterations in hip- or knee-adduction moments (hip: P = .11; knee: P = .52) or impulses (hip: P = .16; knee: P = .41) were found after the nerve block. Similarly, no changes in angular kinematics were observed for contralateral pelvic drop (P = .53), ipsilateral trunk lean (P = .78), or hip adduction (P = .48). Conclusions: A short-term reduction in hip-abductor strength was not associated with alterations in the frontal-plane gait biomechanics of young, healthy men. Further research is needed to determine whether a similar relationship is true in older adults with knee osteoarthritis. Verf.-Referat