Dislocations after total hip-replacement arthroplasties.

1978/03/01 by G E Lewinnek, J L Lewis, R Tarr +2 · 2,846 citations
Mathematics · Medicine · #Acetabulum #Dislocation #Geometry #Hip disorders and treatments #Materials science #Mathematics #Medicine #Orientation (vector space) #Orthodontics #Orthopaedic implants and arthroplasty #Surgery #Total Knee Arthroplasty Outcomes #Total hip replacement

paper · doi:10.2106/00004623-197860020-00014

published in Journal of Bone and Joint Surgery 60(2), 217-220 (Wolters Kluwer)

openalex publication_date 1978/03/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

In a series of 300 total hip replacements, nine (3 per cent) dislocated. Precise measurements of the orientation of the acetabular cup were made and it was found that anterior dislocations were associated with increased acetabular-component anteversion. There was no significant correlation between cup-orientation angle and posterior dislocation. The dislocation rate for cup orientation with anteversion of 15 +/- 10 degrees and lateral opening of 40 +/- 10 degrees was 1.5 per cent, while outside this "safe" range the dislocation rate was 6.1 per cent. Other factors that were documented include time after surgery (with the greatest risk in the first thirty days) and surgical history (with a greater risk in hips that have had prior surgery).

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