• Dislocation of primary total hip arthroplasty and the risk of redislocation.

      Brennan, Stephen A; Khan, Fahim; Kiernan, Christine; Queally, Joseph M; McQuillan, Janette; Gormley, Isobel C; O'Byrne, John M; Cappagh National Orthopaedic Hospital, Finglas, Dublin 11, Ireland. stevobrennan@hotmail.com (Hip international : the journal of clinical and experimental research on hip pathology and therapy, 2012-09)
      6554 primary total hip arthroplasties were reviewed. Risk factors for dislocation were analysed to assess which were important in terms of predicting recurrent instability. The patients risk of having a second dislocation was independently associated with the surgical approach adopted (p = 0.03) and the time to first dislocation from the primary hip replacement (p = 0.002). Early dislocators whose surgery was performed through an anterolateral approach had less recurrence than late dislocators through a posterior or transtrochanteric approach. None of the other risk factors including head size (p = 0.59), modularity (p = 0.54), mechanism of dislocation (p = 0.23), leg length discrepancy (p = 0.69) and acetabular inclination (p = 0.31) were influential. The use of an abduction brace was not useful in preventing a further dislocation with 69.2% of those braced re-dislocating compared to 68.5% who were not braced (p = 0.96).