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n.
replacement of the end of a bone on one side of a joint with a prosthesis (see arthroplasty). It is the treatment for some fractures of the hip and shoulder.
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hemi·ar·thro·plas·ty (hem″e-ahrґthro-plas″te) arthroplasty in which just one joint surface is replaced. hemiarthroplastic adjMedical dictionary. 2011.