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University of Leeds

The large head and cup are a metal-on-metal resurfacing bearing, which has been tested at Leeds University to assess friction. The smaller head and cup are ceramic bearings, again tested for friction. The friction tests involve unidirectional motion, hence the scratching observed. Testing was carried out as detailed in the abstract Brockett et al, Journal of Biomechanics 2006, Volume 39, Supp 1. S530.

Measurement of a small ceramic cup using the Zygo GPI
Measurement of a small ceramic cup using the Zygo GPI


Measurement of a small ceramic head using the Zygo GPI
Measurement of a small ceramic head using the Zygo GPI


Measurement showing worn area of large metal head using the Zygo GPI
Measurement showing worn area of large metal head using the Zygo GPI


Surface finish of a large metal cup at the pole using the NewView 6300
Surface finish of a large metal cup at the pole using the NewView 6300


Surface finish of large metal head at the pole using the NewView 6300
Surface finish of large metal head at the pole using the NewView 6300