• J Arthroplasty · Aug 2009

    Fixed-angle screws vs standard screws in acetabular prosthesis fixation: a cadaveric biomechanical study.

    • Ronald R Hugate, Ian D Dickey, Qingshan Chen, Christina M Wood, Franklin H Sim, and Michael G Rock.
    • The Denver Clinic for Extremities at Risk, Presbyterian/St. Luke's Medical Center, Denver, Colorado 80218, USA.
    • J Arthroplasty. 2009 Aug 1; 24 (5): 806-14.

    AbstractSecure 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.

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