title: Inaccuracy of acetabular reaming under surgical conditions.
abstract: Press-fit uncemented acetabular components require accurate implant-bone cavity fit. Ten cavities produced during actual hip arthroplasty using debris-retaining reamers were replicated in dental alginate. An experimental reamer with better cutting prepared 12 acetabulae in mortuo under similar conditions. Positives in dental stone were measured on a coordinate measuring center. Spheres of best-fit and variation of each point from these spheres were calculated. Control cavities in polyurethane foam were measured to estimate casting errors. Diametral errors of conventionally reamed cavities averaged 2.1%, whereas experimental reamers' cavities varied by 0.5% (P < .005). Overall surface variation from hemispheric form in conventionally reamed cavities exceeded the experimental reamer's results (P < .005). Conventional acetabular reamers cut bone inaccurately. Reamers designed for improved bone cutting reduce cavity errors.
authors.affiliation: Department of Biomaterials/Handicap Research, Institute for Surgical Sciences, University of Göteborg, Sweden.
authors.forename: W
authors.initials: W
authors.lastname: Macdonald
authors.forename: L V
authors.initials: LV
authors.lastname: Carlsson
authors.forename: G J
authors.initials: GJ
authors.lastname: Charnley
authors.forename: C M
authors.initials: CM
authors.lastname: Jacobsson
authors.forename: C B
authors.initials: CB
authors.lastname: Johansson
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D019644:Arthroplasty, Replacement, Hip; D004867:Equipment Design; D006801:Humans