Effect of inward-outward rotation on hip wear simulation

Vesa Saikko*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
19 Downloads (Pure)


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.

Original languageEnglish
Article number109638
Number of pages5
JournalJournal of Biomechanics
Early online date16 Jan 2020
Publication statusPublished - 5 Mar 2020
MoE publication typeA1 Journal article-refereed


  • Extensively cross-linked UHMWPE
  • Hip kinematics
  • Inward-outward rotation
  • Orthopedic biomechanics
  • Wear of natural and artificial joints


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