Abstract
The ISO 14242-1 standard specifies a three-axis motion for the wear testing of prosthetic hips. Multidirectionality of the relative motion and serum-based lubrication are known to be necessary for the reproduction of clinical wear mechanisms. For multidirectionality however, biaxial motion has been shown to be sufficient. To a biaxial hip joint simulator that incorporated flexion-extension (FE, range 46°) and abduction-adduction (AA, range 12°), a third motion component, inward-outward rotation (IOR, range 12°) was added according to the ISO 14242-1 standard. Due to the addition of the IOR, the wear rate of vitamin E stabilized, extensively cross-linked polyethylene (VEXLPE) liners decreased by 50 per cent. This was probably attributable to the increased linearity of the relative motion in the stance phase, caused by the simplified motion waveforms and their relative phases specified in the standard. In order not to underestimate the wear rate, the established biaxial motion is preferred.
Highlights
Wear testing of prosthetic hips is motivated by the fact that wear debris in large amounts may cause tissue damage leading to a need for reoperations (Harris, 2001; Langton et al, 2011)
Due to the addition of the inward-outward rotation (IOR), the wear rate of vitamin E stabilized, extensively cross-linked polyethylene (VEXLPE) liners decreased by 50 per cent
This was probably attributable to the increased linearity of the relative motion in the stance phase, caused by the simplified motion waveforms and their relative phases specified in the standard
Summary
Wear testing of prosthetic hips is motivated by the fact that wear debris in large amounts may cause tissue damage leading to a need for reoperations (Harris, 2001; Langton et al, 2011). Multidirectionality varies substantially (Bennett et al, 2008), which is likely to affect the wear rate (Kang, et al, 2009). Another important factor in the clinical wear rate is the contact pressure distribution that has been shown to be highly patientspecific, depending on the abduction angle of the acetabular component and on the geometry of the musculoskeletal system (Daniel, et al, 2001; Daniel, et al, 2008; Wan, et al, 2008; Košak, et al, 2011; Daniel, et al, 2016)
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