Risk Factors for Conversion to Total Hip Arthroplasty After Acetabular Fractures Involving the Posterior Wall.
Firoozabadi, Reza MD, MA *; Hamilton, Benjamin MD +; Toogood, Paul MD ++; Routt, Milton "Chip" MD [S]; Shearer, Dave MD ++
Journal of Orthopaedic Trauma.
32(12):607-611, December 2018.
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Objectives: Identify risk factors for early conversion to total hip arthroplasty (THA) in an effort to aid in counseling patients and selecting the optimal treatment for patients who sustain a fracture involving the posterior wall of the acetabulum.
Design: Retrospective cohort analysis.
Setting: Level I trauma center.
Patients: Patients with acetabular fractures involving the posterior wall managed with open reduction internal fixation at least 4 years out from surgery.
Intervention: Preoperative and postoperative computed tomography scans were reviewed for injury characteristics and reduction quality. Participants were contacted by telephone to document reoperations and functional outcomes including the SF-8 and modified Merle d'Aubigne Hip Scale.
Main Outcome Measure: Conversion to THA.
Results: The overall rate of conversion to THA was 5% at 2 years, 14% at 5 years, and 17% at 9 years. Presence of 5 specific radiographic features was associated with a 50% rate of conversion to THA in contrast to 11% if 4 or less features were present. Among cases with less than 1 mm of diastasis/step-off on postoperative computed tomography scan, there were no THA conversions, 10% conversion for 1-4 mm, and 54% if 4 mm or more of malreduction. There was no difference in SF-8 or modified Merle d'Aubigne scores comparing patients who underwent THA and those who did not.
Conclusions: Acetabular fractures with posterior wall involvement are associated with a significantly higher rate of conversion to THA if reduction is not near-anatomic. A combination of clinical/radiographic findings is associated with poorer reductions and higher rate of conversion to THA.
Level of Evidence: Prognostic Level IV. See Instructions for Authors for a complete description of levels of evidence.
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