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Proc Inst Mech Eng H. 2015 Jan;229(1):91-7. doi: 10.1177/0954411914567931.

Influence of stem type on material loss at the metal-on-metal pinnacle taper junction.

Author information

1
Institute of Orthopaedics and Musculoskeletal Science, University College London and Royal National Orthopaedic Hospital, Stanmore, UK h.hothi@ucl.ac.uk.
2
Institute of Orthopaedics and Musculoskeletal Science, University College London and Royal National Orthopaedic Hospital, Stanmore, UK.

Abstract

The clinical importance of material loss at the head-stem junction is unknown. Comparison of retrievals with different stem types can provide the opportunity to understand the importance of the taper junction. This was a case-control study involving 20 retrieved 36 mm metal-on-metal Pinnacle (DePuy) hips that were paired with either a Corail (n = 10) or S-ROM (n = 10) stem. The median head taper material loss rate for the Corail group was 0.238 (0.0002-2.178) mm(3)/year and was significantly greater than the S-ROM group (p = 0.042), which had a median material loss rate of 0.132 (0.015-0.518) mm(3)/year. The only significant difference between the groups was the stem taper roughness and length: this was rougher and shorter for the Corails. Long and smooth stem taper designs are preferred when used in conjunction with metal heads.

KEYWORDS:

Wear analysis/testing; biomedical devices; hip prostheses; medical biomaterials; orthopaedic tribology

PMID:
25655958
DOI:
10.1177/0954411914567931
[Indexed for MEDLINE]

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