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.
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.
Authors: Dewei Zhao; Feng Zhang; Benjie Wang; Baoyi Liu; Lu Li; Shin-Yoon Kim; Stuart B Goodman; Philippe Hernigou; Quanjun Cui; William C Lineaweaver; Jiake Xu; Wolf R Drescher; Ling Qin Journal: J Orthop Translat Date: 2020-01-06 Impact factor: 5.191