Contribution from the Field
Hip muscle weakness in individuals with medial knee osteoarthritis
Article first published online: 3 AUG 2010
Copyright © 2010 by the American College of Rheumatology
Arthritis Care & Research
Volume 62, Issue 8, pages 1190–1193, August 2010
How to Cite
Hinman, R. S., Hunt, M. A., Creaby, M. W., Wrigley, T. V., McManus, F. J. and Bennell, K. L. (2010), Hip muscle weakness in individuals with medial knee osteoarthritis. Arthritis Care Res, 62: 1190–1193. doi: 10.1002/acr.20199
- Issue published online: 3 AUG 2010
- Article first published online: 3 AUG 2010
- Manuscript Accepted: 11 MAR 2010
- Manuscript Received: 22 OCT 2009
- National Health and Medical Research Council. Grant Number: 454686
- Sir Randal Heymanson Fellowship from the University of Melbourne
To compare the strength of the hip musculature in people with symptomatic medial knee osteoarthritis (OA) with asymptomatic controls.
Eighty-nine people with knee OA and 23 controls age >50 years were recruited from the community. The maximal isometric strength (torque relative to body mass) of the hip abductors, adductors, flexors, extensors, and internal and external rotators was evaluated using hand-held dynamometry or a customized force transducer apparatus. Univariate linear models with age and sex included as covariates were used to compare muscle strength between groups.
In people with knee OA, significant strength deficits were evident for all hip muscle groups evaluated (P < 0.05). Compared with controls, strength deficits ranged from 16% (hip extensors) to 27% (hip external rotators) after accounting for differences in sex and age between groups.
People with knee OA demonstrate significant weakness of the hip musculature compared with asymptomatic controls. It is not clear if hip muscle weakness precedes the onset of knee OA or occurs as a consequence of disease. Findings from this study support the inclusion of hip strengthening exercises in rehabilitation programs.