Fracture at the stem–condylar junction of a modular femoral prosthesis in a varus–valgus constrained total knee arthroplasty
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We present a rare case of fracture of the modular femoral component in a varus–valgus constrained total knee arthroplasty (TKA) prosthesis which occurred 2 years after implantation. Both femoral and tibial components underwent a second revision using a constrained hinged TKA. Laboratory analysis revealed insufficient metaphyseal bone stock in association with inadequate cement mantle incorporation which made implant fixation solely reliant on the intramedullary stem construct. It was therefore hypothesized that high repetitive stresses over the junction of the modular component led to the fracture. Level of evidence Case report, Level IV.
KeywordsFracture Modular femoral component Varus–valgus constrained Total knee arthroplasty
The authors wish to thank S. Zinelis, Assistant Professor of the Biomaterials Lab, Dental School, University of Athens, for executing the SEM examination and microanalysis of the retrieved specimens under study.
Conflict of interest
Institutional Review Board approval was given prior to the review process.