BACKGROUND: Hip abductor muscle weakness may result in impaired frontal-plane pelvic control during gait, leading to greater medial compartment loading in people with knee osteoarthritis (OA). OBJECTIVE: This study investigated the effect of an 8-week home strengthening program for the hip abductor muscles on knee joint loading (measured by the external knee adduction moment during gait), strength (force-generating capacity), and function and pain in individuals with medial knee OA. DESIGN: The study design was a nonequivalent, pretest-posttest, control group design. SETTING: Testing was conducted in a motor performance laboratory. PATIENTS: An a priori sample size calculation was performed. Forty participants with knee OA were matched for age and sex with a control group of participants without knee OA. INTERVENTION: Participants with knee OA completed ahome hip abductor strengthening program. MEASUREMENTS: Three-dimensional gait analysis was performed to obtain peak knee adduction moments in the first 50% of the stance phase. Isokinetic concentric strength of the hip abductor muscles was measured using an isokinetic dynamometer. The Five-Times-Sit-to-Stand Test was used to evaluate functional performance. Knee pain was assessed with the Western Ontario and McMaster Universities Osteoarthritis Index questionnaire. RESULTS: Following the intervention, the OA group demonstrated significant improvement in hip abductor strength, but not in the knee adduction moment. Functional performance on the sit-to-stand test improved in the OA group compared with the control group. The OA group reported decreased knee pain after the intervention. LIMITATIONS: Gait strategies that may have affected the knee adduction moment, including lateral trunk lean, were not evaluated in this study. CONCLUSIONS:Hip abductor strengthening did not reduce knee joint loading but did improve function and reduce pain in a group with medial knee OA.
RCT Entities:
BACKGROUND:Hip abductor muscle weakness may result in impaired frontal-plane pelvic control during gait, leading to greater medial compartment loading in people with knee osteoarthritis (OA). OBJECTIVE: This study investigated the effect of an 8-week home strengthening program for the hip abductor muscles on knee joint loading (measured by the external knee adduction moment during gait), strength (force-generating capacity), and function and pain in individuals with medial knee OA. DESIGN: The study design was a nonequivalent, pretest-posttest, control group design. SETTING: Testing was conducted in a motor performance laboratory. PATIENTS: An a priori sample size calculation was performed. Forty participants with knee OA were matched for age and sex with a control group of participants without knee OA. INTERVENTION: Participants with knee OA completed a home hip abductor strengthening program. MEASUREMENTS: Three-dimensional gait analysis was performed to obtain peak knee adduction moments in the first 50% of the stance phase. Isokinetic concentric strength of the hip abductor muscles was measured using an isokinetic dynamometer. The Five-Times-Sit-to-Stand Test was used to evaluate functional performance. Knee pain was assessed with the Western Ontario and McMaster Universities Osteoarthritis Index questionnaire. RESULTS: Following the intervention, the OA group demonstrated significant improvement in hip abductor strength, but not in the knee adduction moment. Functional performance on the sit-to-stand test improved in the OA group compared with the control group. The OA group reported decreased knee pain after the intervention. LIMITATIONS: Gait strategies that may have affected the knee adduction moment, including lateral trunk lean, were not evaluated in this study. CONCLUSIONS: Hip abductor strengthening did not reduce knee joint loading but did improve function and reduce pain in a group with medial knee OA.
Authors: Benjamin Steinhilber; Georg Haupt; Regina Miller; Johannes Boeer; Stefan Grau; Pia Janssen; Inga Krauss Journal: Clin Rheumatol Date: 2011-11-17 Impact factor: 2.980
Authors: A H Chang; J S Chmiel; O Almagor; K W Hayes; A Guermazi; P V Prasad; K C Moisio; Y Zhang; J Szymaszek; L Sharma Journal: Osteoarthritis Cartilage Date: 2019-02-28 Impact factor: 6.576
Authors: Jason D Woollard; Alexandra B Gil; Patrick Sparto; C Kent Kwoh; Sara R Piva; Shawn Farrokhi; Christopher M Powers; G Kelley Fitzgerald Journal: J Orthop Sports Phys Ther Date: 2011-09-04 Impact factor: 4.751
Authors: Neil A Segal; Elizabeth R Boyer; Robert Wallace; James C Torner; H John Yack Journal: Arch Phys Med Rehabil Date: 2012-10-09 Impact factor: 3.966
Authors: Shawn Farrokhi; Carrie A Voycheck; Jonathan A Gustafson; G Kelley Fitzgerald; Scott Tashman Journal: Knee Date: 2015-08-29 Impact factor: 2.199
Authors: Michelle Hall; Tim V Wrigley; Ben R Metcalf; Rana S Hinman; Alasdair R Dempsey; Peter M Mills; Flavia M Cicuttini; David G Lloyd; Kim L Bennell Journal: Clin Orthop Relat Res Date: 2014-06-28 Impact factor: 4.176
Authors: Joaquin Calatayud; Jose Casaña; Yasmin Ezzatvar; Markus D Jakobsen; Emil Sundstrup; Lars L Andersen Journal: Knee Surg Sports Traumatol Arthrosc Date: 2016-01-14 Impact factor: 4.342