Taper wear contributes only a third of the total volumetric material loss in large head metal on metal hip replacement

A. J. Hart, Ashley K Matthies, Radu Racasan, Paul J. Bills, A Panagiotidou, Liam Blunt, Gordon Blunn, John Skinner

Research output: Contribution to journalArticle

Abstract

Abstract It has been speculated that high wear at the head-stem taper may contribute to the high failure rates reported for stemmed large head metal-on-metal (LH-MOM) hips. In this study of 53 retrieved LH-MOM hip replacements, we sought to determine the relative contributions of the bearing and taper surfaces to the total wear volume. Prior to revision, we recorded the relevant clinical variables, including whole blood cobalt and chromium levels. Volumetric wear of the bearing surfaces was measured using a coordinate measuring machine and of the taper surfaces using a roundness measuring machine. The mean taper wear volume was lower than the combined bearing surface wear volume (p = 0.015). On average the taper contributed 32.9% of the total wear volume, and in only 28% cases was the taper wear volume greater than the bearing surface wear volume. Despite contributing less to the total material loss than the bearing surfaces, the head-stem taper junction remains an important source of implant-derived wear debris. Furthermore, material loss at the taper is likely to involve corrosion and it is possible that the material released may be more biologically active than that from the bearing surface.
Original languageEnglish
Pages (from-to)14
Number of pages1
JournalBone and joint journal: Orthopaedic Proceedings
Volume95-B
Issue numberSup 13
Publication statusPublished - 1 Mar 2013

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Bearings (structural)
Wear of materials
Metals
Coordinate measuring machines
Debris
Cobalt
Chromium
Blood
Corrosion

Cite this

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title = "Taper wear contributes only a third of the total volumetric material loss in large head metal on metal hip replacement",
abstract = "Abstract It has been speculated that high wear at the head-stem taper may contribute to the high failure rates reported for stemmed large head metal-on-metal (LH-MOM) hips. In this study of 53 retrieved LH-MOM hip replacements, we sought to determine the relative contributions of the bearing and taper surfaces to the total wear volume. Prior to revision, we recorded the relevant clinical variables, including whole blood cobalt and chromium levels. Volumetric wear of the bearing surfaces was measured using a coordinate measuring machine and of the taper surfaces using a roundness measuring machine. The mean taper wear volume was lower than the combined bearing surface wear volume (p = 0.015). On average the taper contributed 32.9{\%} of the total wear volume, and in only 28{\%} cases was the taper wear volume greater than the bearing surface wear volume. Despite contributing less to the total material loss than the bearing surfaces, the head-stem taper junction remains an important source of implant-derived wear debris. Furthermore, material loss at the taper is likely to involve corrosion and it is possible that the material released may be more biologically active than that from the bearing surface.",
author = "Hart, {A. J.} and Matthies, {Ashley K} and Radu Racasan and Bills, {Paul J.} and A Panagiotidou and Liam Blunt and Gordon Blunn and John Skinner",
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language = "English",
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journal = "Bone and joint journal: Orthopaedic Proceedings",
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Taper wear contributes only a third of the total volumetric material loss in large head metal on metal hip replacement. / Hart, A. J.; Matthies, Ashley K; Racasan, Radu; Bills, Paul J.; Panagiotidou, A; Blunt, Liam; Blunn, Gordon; Skinner, John.

In: Bone and joint journal: Orthopaedic Proceedings, Vol. 95-B, No. Sup 13, 01.03.2013, p. 14.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Taper wear contributes only a third of the total volumetric material loss in large head metal on metal hip replacement

AU - Hart, A. J.

AU - Matthies, Ashley K

AU - Racasan, Radu

AU - Bills, Paul J.

AU - Panagiotidou, A

AU - Blunt, Liam

AU - Blunn, Gordon

AU - Skinner, John

PY - 2013/3/1

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N2 - Abstract It has been speculated that high wear at the head-stem taper may contribute to the high failure rates reported for stemmed large head metal-on-metal (LH-MOM) hips. In this study of 53 retrieved LH-MOM hip replacements, we sought to determine the relative contributions of the bearing and taper surfaces to the total wear volume. Prior to revision, we recorded the relevant clinical variables, including whole blood cobalt and chromium levels. Volumetric wear of the bearing surfaces was measured using a coordinate measuring machine and of the taper surfaces using a roundness measuring machine. The mean taper wear volume was lower than the combined bearing surface wear volume (p = 0.015). On average the taper contributed 32.9% of the total wear volume, and in only 28% cases was the taper wear volume greater than the bearing surface wear volume. Despite contributing less to the total material loss than the bearing surfaces, the head-stem taper junction remains an important source of implant-derived wear debris. Furthermore, material loss at the taper is likely to involve corrosion and it is possible that the material released may be more biologically active than that from the bearing surface.

AB - Abstract It has been speculated that high wear at the head-stem taper may contribute to the high failure rates reported for stemmed large head metal-on-metal (LH-MOM) hips. In this study of 53 retrieved LH-MOM hip replacements, we sought to determine the relative contributions of the bearing and taper surfaces to the total wear volume. Prior to revision, we recorded the relevant clinical variables, including whole blood cobalt and chromium levels. Volumetric wear of the bearing surfaces was measured using a coordinate measuring machine and of the taper surfaces using a roundness measuring machine. The mean taper wear volume was lower than the combined bearing surface wear volume (p = 0.015). On average the taper contributed 32.9% of the total wear volume, and in only 28% cases was the taper wear volume greater than the bearing surface wear volume. Despite contributing less to the total material loss than the bearing surfaces, the head-stem taper junction remains an important source of implant-derived wear debris. Furthermore, material loss at the taper is likely to involve corrosion and it is possible that the material released may be more biologically active than that from the bearing surface.

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