Stem taper mismatch has a critical effect on ceramic head fracture risk in modular hip arthroplasty.
作者信息
Gührs Julian, Körner Mandy, Bechstedt Maren, Krull Annika, Morlock Michael M
机构信息
TUHH Hamburg University of Technology, Denickestrasse 15, 21073 Hamburg, Germany.
出版信息
Clin Biomech (Bristol). 2017 Jan;41:106-110. doi: 10.1016/j.clinbiomech.2016.12.009. Epub 2016 Dec 16.
BACKGROUND
Modular total hip prostheses with ceramic heads are well established in orthopedic surgery and widely used. With the variety of different manufacturers and available designs, components are at risk for mismatch. Several case studies show the potentially devastating effects of mismatch.
METHODS
The aim of this study was to investigate the outcome of one arbitrary component mismatch with commercially available components that appear to provide a stable fixation during assembly. A biomechanical in-vitro analysis of fracture strength (n=5) was carried out in accordance with ISO 7206-10. "Type1" Bi-Metric®-stems were mismatched with "V40" AlO ceramic heads.
FINDINGS
Mean fracture strength was reduced to about 50% of the recommended FDA minimum by the mismatch (Mean 23.68kN, SD 2.35kN). A small contact area between head and stem taper was identified as a potential key parameter.
INTERPRETATION
Mixing and matching components can put a patient at greater risk for ceramic head fracture and must be avoided.
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