Welds in the Stems of Cast Cobalt Chrome Femoral Components for Use in Total Hip Replacements

Dobbs, H. S.

doi:10.1243/emed_jour_1978_007_009_02

Engineering in Medicine

1978

DOI: 10.1243/emed_jour_1978_007_009_02

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Welds in the Stems of Cast Cobalt Chrome Femoral Components for Use in Total Hip Replacements

H. S. Dobbs¹

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1981

1983

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The incidence and significance of rub marks on the stem of removed total hip replacements

Dobbs

Robertson

1983

J. Biomed. Mater. Res.

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This article presents data on the incidence of rub marks (burnishing) on the stems of 180 removed total hip replacement femoral components most of which were McKees and Stanmores. The incidence varied with the reason for removal. It was low for assorted removals excluding fractured stem removals, higher for "loose stem" removals, and highest for fractured stem removals. For "loose stem" removals, it appeared to increase with implantation time. For fractured stem removals it appeared to increase with the time elapsed between fracture and removal. On not-fractured removals, rub marks appeared to indicate that the component had been loose, but on fractured stem removals they appeared to indicate only that the component had been loose after fracture.

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The incidence and significance of rub marks on the stem of removed total hip replacements

Dobbs

Robertson

1983

J. Biomed. Mater. Res.

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Fracture of hip prostheses due to welding defects

Kousbroek

Ducheyne

Perre

et al. 1981

Arch. Orth. Traum. Surg.

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Two retrieved Moore type hip prostheses of cast Co-Cr-Mo-alloy were examined after metallic failure. The first case concerns a fatigue fracture in the stem of the prosthesis due to an abrupt change in the cross-sectional area and the presence of inappropriate welding beads in the stem. The abrupt change occurring at a transition from an I-beam into a rectangular profile gives rise to stress concentrations thus increasing change of fatigue crack initiation. The second case is a fracture of the hollow head of the prosthesis through a weld. The two parts of the cast femoral head were incompletely welded. Comparison with similar welds in other femoral heads of prostheses of the same type reveals a poor welding uniformity. Hence, both fractures are associated with the welding process. A critical investigation is needed to find optimal welding conditions for Co-Cr-Mo-alloy prostheses.

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Welds in the Stems of Cast Cobalt Chrome Femoral Components for Use in Total Hip Replacements

Cited by 2 publications

References 1 publication

The incidence and significance of rub marks on the stem of removed total hip replacements

The incidence and significance of rub marks on the stem of removed total hip replacements

Fracture of hip prostheses due to welding defects

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