Influence of various types of damage on the fracture strength of ceramic femoral heads
-
Viola Wuttke
,
Hartmut Witte
Abstract
Ceramic-on-ceramic articulations are a frequently used bearing for total hip replacements. This success mainly is due to their excellent tribological properties. Ceramics can withstand high pressure loads due to its brittleness but only low bending stresses. A ceramic ball head fracture is the result of subcritical crack growth. This kind of fracture in vivo can abet by damage or contamination of the stem cone. The main goal of this work is to provide a risk assessment of different possible damage mechanisms and contaminations that may result in lower fracture strength of a ceramic ball head. To simulate potential causes, different types and dimensions of metal wire, foils, hair, and lubricants were inserted between the ceramic ball head and the metal cone of the stem. The test results clearly show that fracture strength is negatively influenced by most of the inhomogeneities between the cone and the head because they increase the peak stresses acting on a part of the ceramic ball head. The results of this article clearly confirm the demand for an undamaged taper fit “free of contamination” between the ceramic head and the metal cone during implantation.
©2011 by Walter de Gruyter Berlin Boston
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Artikel in diesem Heft
- Research Articles
- Electric impedance tomography for monitoring volume and size of the urinary bladder
- Improving local PCA in pseudo phase space for fetal heart rate estimation from single lead abdominal ECG
- Effect of malpositioned anterior cruciate ligament replacement on knee joint structures: a biomechanical model
- Pedicle-screw-based dynamic implants may increase posterior intervertebral disc bulging during flexion
- Influence of various types of damage on the fracture strength of ceramic femoral heads
- Psychophysiological classification and staging of mental states during meditative practice
- Can contextual online exams in practical biomedical education increase comprehension and motivation? A pilot project
