Abstract
In a series of 278 total hip arthroplasties, fifteen dislocations occurred. There were 4 men and 11 women; their average age was 68 years (range, 45 to 80 years). The diagnosis before hip replacement was osteoarthritis in 9 patients, rheumatoid arthritis in 4, and revision for failed femoral prostheses. Six dislocations were anterior and seven were posterior. The mean cup abduction angle was 44.9 degrees (32-58) and anteversion was 11.3 degrees (1-33). There was no statistical difference between the dislocated hips and the control group with respect to abduction or anteversion of hip prosthetic components. Seven hips had previous surgery and ten dislocation were considered to be caused by soft tissue imbalance. Muscular imbalance rather than malposition of the components was the major factor determining dislocation.
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