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Retrieval analysis and principal variable analysis of 127 M2a-38 Mm™ metal on metal hip replacements

Retrieval analysis and principal variable analysis of 127 M2a-38 Mm™ metal on metal hip replacements
Retrieval analysis and principal variable analysis of 127 M2a-38 Mm™ metal on metal hip replacements
Background
The objective of this study was to investigate the factors which affected the material loss from 127 M2a-38 mm™ hip replacements.

Methods
The alignment and patient data was obtained for 127 patients. The explants bearings and tapers were measured to determine the level of material loss and their geometry.

Results
87 joints were edge wearing (EW), 28 normally wearing (NW) and 12 had edge interaction (EI). The NW joints were wearing at a mean bearing combined rate of 0.34 mm3/yr. For the NW joints, bearing clearance was linked to the bearing combined volumetric loss rate (r = 0.446). The rates of loss from the head's taper was 0.21 mm3/yr. Lower wearing and lower clearance joints had higher values of loss from the tapers. The taper loss from joints with a positive clearance were significantly higher (p = .026) than those with a negative clearance.

Conclusions
The results demonstrate that bearing loss rates for NW joints was as expected. The high number of joints showing signs of edge wearing resulted from low clearances and a low cup articular arc angle. The taper loss was lower than other similar joint designs with positive clearances resulting in greater loss.
Metal on Metal, Hip implant, Orthopaedics, Retrieval Analysis
2352-5738
Cook, Richard
06f8322d-81be-4f82-9326-19e55541c78f
Pearce, Andrea
db2c76b4-e984-4d7b-b76c-6aad13fac9b7
Culliford, David
25511573-74d3-422a-b0ee-dfe60f80df87
Briant-Evans, Toby
e1f8499b-e982-4b98-b478-e2b83cb60519
Griffiths, Jamie
3dfa88b3-1b3d-4926-8413-7d81ab37e38e
Britton, John
6857c532-b076-4fbc-82bd-78a147a54d32
Stranks, Geoff
44bba644-ce48-47db-8427-18913e1ca158
Cook, Richard
06f8322d-81be-4f82-9326-19e55541c78f
Pearce, Andrea
db2c76b4-e984-4d7b-b76c-6aad13fac9b7
Culliford, David
25511573-74d3-422a-b0ee-dfe60f80df87
Briant-Evans, Toby
e1f8499b-e982-4b98-b478-e2b83cb60519
Griffiths, Jamie
3dfa88b3-1b3d-4926-8413-7d81ab37e38e
Britton, John
6857c532-b076-4fbc-82bd-78a147a54d32
Stranks, Geoff
44bba644-ce48-47db-8427-18913e1ca158

Cook, Richard, Pearce, Andrea, Culliford, David, Briant-Evans, Toby, Griffiths, Jamie, Britton, John and Stranks, Geoff (2019) Retrieval analysis and principal variable analysis of 127 M2a-38 Mm™ metal on metal hip replacements. Biotribology, 19, [100102]. (doi:10.1016/j.biotri.2019.100102).

Record type: Article

Abstract

Background
The objective of this study was to investigate the factors which affected the material loss from 127 M2a-38 mm™ hip replacements.

Methods
The alignment and patient data was obtained for 127 patients. The explants bearings and tapers were measured to determine the level of material loss and their geometry.

Results
87 joints were edge wearing (EW), 28 normally wearing (NW) and 12 had edge interaction (EI). The NW joints were wearing at a mean bearing combined rate of 0.34 mm3/yr. For the NW joints, bearing clearance was linked to the bearing combined volumetric loss rate (r = 0.446). The rates of loss from the head's taper was 0.21 mm3/yr. Lower wearing and lower clearance joints had higher values of loss from the tapers. The taper loss from joints with a positive clearance were significantly higher (p = .026) than those with a negative clearance.

Conclusions
The results demonstrate that bearing loss rates for NW joints was as expected. The high number of joints showing signs of edge wearing resulted from low clearances and a low cup articular arc angle. The taper loss was lower than other similar joint designs with positive clearances resulting in greater loss.

Text
Biotribology M2a accepted manuscript main - Accepted Manuscript
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More information

Accepted/In Press date: 6 July 2019
e-pub ahead of print date: 9 July 2019
Published date: September 2019
Keywords: Metal on Metal, Hip implant, Orthopaedics, Retrieval Analysis

Identifiers

Local EPrints ID: 432668
URI: http://eprints.soton.ac.uk/id/eprint/432668
ISSN: 2352-5738
PURE UUID: 96e8ff22-0803-4915-9dc3-fd80915fe77a
ORCID for Richard Cook: ORCID iD orcid.org/0000-0002-2468-5820
ORCID for David Culliford: ORCID iD orcid.org/0000-0003-1663-0253

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Date deposited: 24 Jul 2019 16:30
Last modified: 16 Mar 2024 08:03

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Contributors

Author: Richard Cook ORCID iD
Author: Andrea Pearce
Author: David Culliford ORCID iD
Author: Toby Briant-Evans
Author: Jamie Griffiths
Author: John Britton
Author: Geoff Stranks

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