Intraprosthetic Disassembly of the Charnley-Hastings Prosthesis

The Charnley-Hastings hip prosthesis is a hybrid bipolar hemiarthroplasty derived from a Hastings acetabular component and a Charnley stem. This report documents a presentation in which the acetabular component rotated in a medial fashion, resulting in an intra-acetabular dislocation of the Charnley femoral component.