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Reliability of Physical Examination in the Measurement of Hip Flexion Contracture and Correlation with Gait Parameters in Cerebral Palsy
Kyoung Min Lee, MD1; Chin Youb Chung, MD1; Dae Gyu Kwon, MD1; Ho Sung Han, MD1; In Ho Choi, MD2; Moon Seok Park, MD1
1 Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, 300 Gumi-Dong, Bundang-Gu, Sungnam, Kyungki 463-707, South Korea. E-mail address for M.S. Park: pmsmed@gmail.com
2 Department of Orthopaedic Surgery, Seoul National University Children's Hospital, 28 Yeongeon-Dong, Chongro-Gu, Seoul 110-744, South Korea
View Disclosures and Other Information
Disclosure: The authors did not receive any outside funding or grants in support of their research for or preparation of this work. Neither they nor a member of their immediate families received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity.

Investigation performed at the Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Kyungki, South Korea

Copyright © 2011 by The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2011 Jan 19;93(2):150-158. doi: 10.2106/JBJS.J.00252
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Abstract

Background: 

This study was undertaken to determine the validity and reliability of the physical examination tests commonly used to measure hip flexion contracture in patients with cerebral palsy who are able to walk.

Methods: 

Thirty-six consecutive patients (twenty-two male and fourteen female patients), with a mean age (and standard deviation) of 9.8 ± 3.9 years, who had cerebral palsy (level I, II, or III on the Gross Motor Function Classification System) and thirty-seven children without cerebral palsy (nineteen male and eighteen female subjects), with a mean age of 10.0 ± 3.0 years, were enrolled prospectively for this study. Hip flexion contracture was determined by three physical examination tests: the Thomas test, the prone hip extension test (the Staheli test), and the hamstring shift test. Three-dimensional gait analysis was performed in all subjects. The interobserver reliabilities of the three physical examination tests were determined with use of three observers. Convergent validity was assessed by evaluating the relationships between the findings on physical examination and kinematic and kinetic gait variables (maximum hip extension during stance and hip flexor index) and three-dimensional modeled psoas lengths.

Results: 

The Thomas test showed the highest intraclass correlation coefficient (0.501 in patients and 0.207 in controls) and the smallest mean absolute difference (5.8° in patients and 1.2° in controls). The Staheli test was found to be the most valid method in the patient group (r = 0.568 with hip flexor index), whereas the Thomas test was the most valid in the control group (r = 0.526 with maximum hip extension in stance, and r = 0.532 with the hip flexor index). The hamstring shift test had the lowest intraclass correlation coefficient and the lowest convergent validity.

Conclusions: 

While the Thomas test showed the highest intraclass correlation coefficient and the smallest mean absolute difference, the Staheli test was the most valid method for detecting hip flexion contractures in patients with cerebral palsy. Although the Staheli test cannot be used for intraoperative assessment, we recommend that this test be included in preoperative physical examinations to determine the role of a hip flexion contracture in the abnormal gait of patients with cerebral palsy.

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    References

    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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