Screw osteolysis in the cementless anatomic modular knee arthroplasty.

A cohort of patients underwent prospective follow-up to delineate the natural history of screw-associated osteolysis in cementless Anatomic Modular Knee arthroplasty. In 1993, fluoroscopically guided radiographs were obtained in 230 patients (280 arthroplasties) to identify occult osteolysis. This cohort was reassessed periodically to identify new or progressive screw-associated osteolysis.

Computed tomography analysis of acetabular anteversion and abduction.

Purpose: The purpose of this study is to define the normal range of acetabular abduction and anteversion in relation to pelvic anatomy as depicted on conventional CT scan.

Methods: We retrospectively reviewed 100 pelvic CT scans performed on patients presenting for evaluation of non-orthopaedic pathology. The study group consisted of 58 women and 42 men, aged between 18 and 88 years.

Stem fracture of conserve hemiarthroplasty.

Resurfacing hemiarthroplasty of the femoral head has been recommended as a bone-preserving alternative to total hip arthroplasty for the management of osteonecrosis of the femoral head in the young patient. This case report describes failure of a cemented resurfacing hemiarthroplasty resulting from a fracture through the stem of the implant.