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Journal of Orthopaedic Trauma:
doi: 10.1097/BOT.0b013e3181d76918
Original Article

Magnetic Resonance Imaging in Traumatic Posterior Hip Dislocation

Tannast, Moritz MD*; Pleus, Frank MD†; Bonel, Harald MD†; Galloway, Howard MD‡; Siebenrock, Klaus A MD*; Anderson, Suzanne E MD†§

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Objectives: The objective was to report the ability of a magnetic resonance image to document the integrity of the obturator externus tendon after posterior hip dislocation as a potential predictor for preserved femoral head vascularity.

Design: Retrospective radiographic and clinical pilot study.

Setting: Level I trauma center.

Patients/Participants: Nineteen consecutive patients with traumatic posterior hip dislocation.

Outcome Evaluation: Intraoperative correlation of soft tissue damage and radiographic assessment of avascular necrosis of the femoral head 3 years postinjury.

Methods: Magnetic resonance imaging performed in the acute phase of posterior hip dislocation. Correlation with intraoperative findings during surgical hip dislocation and with avascular necrosis 3 years postinjury.

Results: The obturator externus tendon was intact in all cases with preserved femoral head vascularity. After a 3-year follow up, there were no cases of avascular necrosis.

Conclusion: In this small series of patients, posterior hip dislocation did not imply a tear of the obturator externus muscle. An intact obturator externus tendon suggests preservation of the deep branch of the medial femoral circumflex artery to the femoral head.

© 2010 Lippincott Williams & Wilkins, Inc.

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