Complete luxation of the polyethylene inlay after internal hemipelvectomy and custom made endoprothesis.

We report about an exceptional complication after internal hemipelvectomy a nd replacement of the defect with a custom-made endoprosthesis.:A complete luxation of the PE-inlay out of the metal cup occurred. Radiologically we a ssumed a luxation of the femoral head in dorsal direction. Revision after a failed attempt of closed reposition showed a complete luxation of the inla y, which was caused by deficient fixation in the acetabular component. The absence of a contrast wire in the PE-inlay delayed the right diagnosis and made it difficult to find the dislocated inlay in the large wound.