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Stiffness, Pain, and Hip Muscle Strength Are Factors Associated With Self-reported Physical Disability in Hip Osteoarthritis

Steinhilber, Benjamin PhD1; Haupt, Georg PT1; Miller, Regina; Grau, Stefan PhD2; Janssen, Pia MD1; Krauss, Inga PhD1

Journal of Geriatric Physical Therapy: July/September 2014 - Volume 37 - Issue 3 - p 99–105
doi: 10.1519/JPT.0b013e3182abe7b5
Research Reports

Background: Physical disability (PD) is common among patients with osteoarthritis (OA) of the hip. Exercise therapy is proposed to be a potential intervention to reduce PD. However, the optimal targets of an exercise program are not known.

Purpose: The aim of the present study was to identify factors that explain the level of self-reported PD in patients with hip OA. Knowledge of these factors will help develop specific and effective exercise programs.

Methods: Data from 149 patients with hip OA (85 men and 64 women) were analyzed. Self-reported PD was quantified using the physical function subscale of the Western Ontario and McMaster index. A stepwise regression analysis was conducted to identify significant factors associated with self-reported PD.

Results: Stiffness, pain, and hip muscle strength were found to be significant factors related to the level of self-reported PD in hip OA. These factors explained 59% (r 2 adjusted = 0.59) of the variance. Body mass index, gender, age, and passive internal hip rotation and flexion range of motion explained only minor parts of the dependent variable self-reported PD.

Discussion and Conclusion: Stiffness, pain, and hip muscle strength are associated with self-reported PD in hip OA. It is imperative that exercise treatments for hip OA include strategies to modify these factors. Further research should evaluate their role in preventing hip OA.

1Medical Clinic, Department of Sports Medicine, University of Tübingen, Tuebingen, Germany.

2University of Gothenburg, Department of Food and Nutrition, and Sport Science Biomechanics, Göteborg, Schweden.

Address correspondence to: Benjamin Steinhilber, PhD, Medical Clinic, Department of Sports Medicine, University of Tübingen, Hoppe-Seyler-Str. 6, 72076 Tuebingen, Germany (

The authors declare no conflicts of interest.

Robert Wellmon was the Decision Editor.

Copyright © 2014 the Section on Geriatrics of the American Physical Therapy Association