title: Fixed-angle screws vs standard screws in acetabular prosthesis fixation: a cadaveric biomechanical study.
abstract: Secure fixation of acetabular components in total hip arthroplasty can be challenging. The purpose of this study was to perform biomechanical analysis of cup fixation strength using fixed-angle vs standard screw fixation. Multihole, porous-backed acetabular prostheses were implanted in both acetabuli of 8 cadaveric pelves using standard press-fit techniques. Fixed-angle screws were used on the left side, and standard cancellous screws were used in the right. The use of fixed-angle screws enhanced acetabular fixation substantially under subfailure cyclic loading conditions and load-to-failure. The triradiate screw configuration increases the bending moment required to fail the specimens as well. Fixed-angle screws may be useful for achieving rigid fixation of acetabular prostheses in challenging clinical scenarios.
authors.affiliation: The Denver Clinic for Extremities at Risk, Presbyterian/St. Luke's Medical Center, Denver, Colorado 80218, USA.
authors.forename: Ronald R
authors.initials: RR
authors.lastname: Hugate
authors.forename: Ian D
authors.initials: ID
authors.lastname: Dickey
authors.forename: Qingshan
authors.initials: Q
authors.lastname: Chen
authors.forename: Christina M
authors.initials: CM
authors.lastname: Wood
authors.forename: Franklin H
authors.initials: FH
authors.lastname: Sim
authors.forename: Michael G
authors.initials: MG
authors.lastname: Rock
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D001696:Biomechanical Phenomena; D001863:Bone Screws; D002102:Cadaver; D006622:Hip Prosthesis; D006801:Humans