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    Generalized Joint Hypermobility Is Predictive of Hip Capsular Thickness

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    Author
    Devitt, BM; Smith, BN; Stapf, R; Tacey, M; O'Donnell, JM
    Date
    2017-04-19
    Source Title
    Orthopaedic Journal of Sports Medicine
    Publisher
    SAGE PUBLICATIONS INC
    University of Melbourne Author/s
    Tacey, Mark
    Affiliation
    Melbourne School of Population and Global Health
    Metadata
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    Document Type
    Journal Article
    Citations
    Devitt, B. M., Smith, B. N., Stapf, R., Tacey, M. & O'Donnell, J. M. (2017). Generalized Joint Hypermobility Is Predictive of Hip Capsular Thickness. ORTHOPAEDIC JOURNAL OF SPORTS MEDICINE, 5 (4), https://doi.org/10.1177/2325967117701882.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/259672
    DOI
    10.1177/2325967117701882
    Abstract
    BACKGROUND: The pathomechanics of hip microinstability are not clearly defined but are thought to involve anatomical abnormalities, repetitive forces across the hip, and ligamentous laxity. PURPOSE/HYPOTHESIS: The purpose of this study was to explore the relationship between generalized joint hypermobility (GJH) and hip capsular thickness. The hypothesis was that GJH would be predictive of a thin hip capsule. STUDY DESIGN: Cross-sectional study; Level of evidence, 3. METHODS: A prospective study was performed on 100 consecutive patients undergoing primary hip arthroscopy for the treatment of hip pain. A Beighton test score (BTS) was obtained prior to each procedure. The maximum score was 9, and a score of ≥4 was defined as hypermobile. Capsular thickness at the level of the anterior portal, corresponding to the location of the iliofemoral ligament, was measured arthroscopically using a calibrated probe. The presence of ligamentum teres (LT) pathology was also recorded. RESULTS: Fifty-five women and 45 men were included in the study. The mean age was 32 years (range, 18-45 years). The median hip capsule thickness was statistically greater in men than women (12.5 and 7.5 mm, respectively). The median BTS for men was 1 compared with 4 for women (P < .001). A statistically significant association was found between BTS and capsular thickness; a BTS of <4 is strongly predictive of having a capsular thickness of ≥10 mm, while a BTS ≥4 correlates with a capsular thickness of <10 mm. There was a statistically greater incidence of LT tears in patients with a capsular thickness of ≤7.5 mm and a BTS of ≥4 (P < .001). CONCLUSION: Measurement of the GJH is highly predictive of hip capsular thickness. A BTS of <4 correlates significantly with a capsular thickness of ≥10 mm, while a BTS ≥4 correlates significantly with a thickness of <10 mm.

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