Abstract
The Thompson hemiarthroplasty is a popular hip prosthesis. We present two case reports highlighting a significant alteration in the design of the implant which compromised the success of the operations. In recent years the manufacturing process of this prosthesis has changed, with a resultant increase in the volume of the stem of 10 ml. It is essential that manufacturers inform orthopaedic surgeons of any alteration in the design of the implant and supply compatible instrumentation to minimise surgical errors. Surgeons must remain vigilant when checking the compatibility of the trial and definitive prostheses.
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