The effect of acetabular cup position on wear of a large-diameter metal-on-metal prosthesis studied with a hip joint simulator

Vesa Saikko, Tiina Ahlroos, Hannu Revitzer, Oskari Ryti, Petri Kuosmanen

Research output: Contribution to journalArticle

16 Citations (Scopus)


Clinically, malposition of the acetabular cup in large-diameter metal-on-metal prosthetic hip designs is associated with high wear, adverse reaction to metal debris and early failure. A steep angle of the cup (>60°) may lead to poor tribological performance. Large-diameter CoCr-on-CoCr prostheses were run in the HUT-4 hip joint simulator so that a steep angle was included. With a correct position, the tribological behaviour was excellent, the wear rate being 0.1 mm3/106 cycles. In the steepest position, lubrication failed and the wear rate was two orders of magnitude higher. This study stresses the importance of rigorous pre-clinical testing.
Original languageEnglish
Pages (from-to)70-76
JournalTribology International
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed



  • Metal-on-metal
  • acetabular cup position
  • abduction angle
  • edge loading

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