Title: Fracture of hip prostheses due to welding defects
Authors: Kousbroek, R
Ducheune, P
Van der Perre, Georges
Aernoudt, E
Mulier, JC #
Issue Date: Feb-1981
Publisher: Springer
Series Title: Archives of Orthopaedic and Traumatic Surgery vol:98 issue:1 pages:51-56
Abstract: 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 chance 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.
ISSN: 0936-8051
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Biomechanics Section
# (joint) last author

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