Restoring femoral offset is the most important technical factor in preventing total hip arthroplasty dislocation

PURPOSE: Our aim was to determine if acetabular component position, femoral offset restoration, or leg-length equality is most important for total hip arthroplasty (THA) stability. METHODS: A matched case (n = 67)-control (n = 247) design and conditional logistic regression model were used to examine risk factors for dislocation in primary THA. RESULTS: When femoral offset was at least 3 mm greater than that of the contralateral hip, risk of dislocation was lower (p = 0.0192). Neither leg-length difference nor acetabular component abduction or version angle was associated with dislocation. CONCLUSIONS: Our data suggest restoring femoral offset is the most important technical factor in preventing THA dislocation.