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General Orthopaedics

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Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_34 | Pages 115 - 115
1 Dec 2013
Latham J Cook R Bolland B Yasen S
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Background

Large diameter chrome cobalt modular heads in hip replacement surgery have caused one of the biggest challenges to face orthopaedic surgeons, manufacturers and regulators in a generation. Increasing numbers of retrieved implants offer the opportunity to look in detail at the modes of failure of these devices.

Methods

We have examined the mechanical behaviour of the head taper/trunnion using a variety of techniques including:

mechanical testing in a custom-made jig

3D nano-precision form profilometry (RedLux)

optical 3D microscopy with focus variation technology

electro-chemical testing.