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Magnetic resonance imaging in traumatic posterior hip dislocation.
Moritz Tannast1, Frank Pleus, Harald Bonel
1Department of Orthopedic Surgery, University of Bern, Bern, Switzerland. moritz.tannast@insel.ch
Journal of Orthopaedic Trauma
|November 11, 2010
Summary
Magnetic resonance imaging can assess the obturator externus tendon after posterior hip dislocation. An intact tendon indicates preserved blood supply to the femoral head, preventing avascular necrosis.
Area of Science:
- Orthopedic surgery
- Radiology
- Trauma care
Background:
- Posterior hip dislocation can compromise blood supply to the femoral head.
- Assessing the integrity of surrounding soft tissues is crucial for predicting outcomes.
Purpose of the Study:
- To evaluate the utility of MRI in documenting obturator externus tendon integrity post-posterior hip dislocation.
- To determine if tendon integrity predicts femoral head vascularity.
Main Methods:
- Retrospective pilot study of 19 patients with posterior hip dislocation.
- MRI performed acutely; correlated with intraoperative findings and 3-year avascular necrosis assessment.
Main Results:
- The obturator externus tendon was intact in all cases.
- All patients maintained femoral head vascularity.
- No cases of avascular necrosis were observed at 3-year follow-up.
Conclusions:
- Posterior hip dislocation does not necessarily lead to obturator externus tendon tears.
- An intact obturator externus tendon on MRI suggests preserved blood flow to the femoral head via the deep medial femoral circumflex artery.
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