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

Harry S. Hothi; Robert K. Whittaker; Jay M. Meswania; Gordon W. Blunn; John A. Skinner; Alister J. Hart

doi:10.1177/0954411914567931

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

Harry S. Hothi, Robert K. Whittaker, Jay M. Meswania, Gordon W. Blunn, John A. Skinner, Alister J. Hart

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	91-97
Number of pages	7
Journal	Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
Volume	229
Issue number	1
DOIs	https://doi.org/10.1177/0954411914567931
Publication status	Published - Jan 2015

Keywords

Adult
Aged
Equipment Failure Analysis
Female
Friction
Hip Prosthesis
Humans
Metal-on-Metal Joint Prostheses
Metals
Middle Aged
Particle Size
Prosthesis Design
Surface Properties
Comparative Study
Evaluation Studies
Research Support, Non-U.S. Gov't

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title = "Influence of stem type on material loss at the metal-on-metal pinnacle taper junction",

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 = "Adult, Aged, Equipment Failure Analysis, Female, Friction, Hip Prosthesis, Humans, Metal-on-Metal Joint Prostheses, Metals, Middle Aged, Particle Size, Prosthesis Design, Surface Properties, Comparative Study, Evaluation Studies, Research Support, Non-U.S. Gov't",

author = "Hothi, {Harry S.} and Whittaker, {Robert K.} and Meswania, {Jay M.} and Blunn, {Gordon W.} and Skinner, {John A.} and Hart, {Alister J.}",

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AU - Hothi, Harry S.

AU - Whittaker, Robert K.

AU - Meswania, Jay M.

AU - Blunn, Gordon W.

AU - Skinner, John A.

AU - Hart, Alister J.

N1 - Post-print is unavailable.

PY - 2015/1

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N2 - 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.

AB - 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.

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KW - Hip Prosthesis

KW - Humans

KW - Metal-on-Metal Joint Prostheses

KW - Metals

KW - Middle Aged

KW - Particle Size

KW - Prosthesis Design

KW - Surface Properties

KW - Comparative Study

KW - Evaluation Studies

KW - Research Support, Non-U.S. Gov't

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JO - Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine

JF - Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine

IS - 1

ER -

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

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Keywords

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