title: Dislocation of primary total hip arthroplasty and the risk of redislocation.
abstract: 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).
authors.affiliation: Cappagh National Orthopaedic Hospital, Finglas, Dublin 11, Ireland. stevobrennan@hotmail.com
authors.forename: Stephen A
authors.initials: SA
authors.lastname: Brennan
authors.forename: Fahim
authors.initials: F
authors.lastname: Khan
authors.forename: Christine
authors.initials: C
authors.lastname: Kiernan
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Queally
authors.forename: Janette
authors.initials: J
authors.lastname: McQuillan
authors.forename: Isobel C
authors.initials: IC
authors.lastname: Gormley
authors.forename: John M
authors.initials: JM
authors.lastname: O'Byrne
mesh_terms: D000077:Acetabulum / Q000473:pathology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects* / Q000379:methods; D001915:Braces; D005260:Female; D005270:Femur Head / Q000473:pathology; D006617:Hip Dislocation / Q000453:epidemiology / Q000209:etiology* / Q000601:surgery; D006621:Hip Joint / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D007593:Joint Instability / Q000453:epidemiology / Q000209:etiology* / Q000601:surgery; D007870:Leg Length Inequality; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure / Q000209:etiology*; D016059:Range of Motion, Articular; D012008:Recurrence; D012307:Risk Factors; D055815:Young Adult