Effect of distal stem geometry on interface motion in uncemented revision total hip prostheses.

In this study, we compared differences in motion at the bone-prosthesis interface in femora in which a fluted, tapered, or cylindrical distal stem design had been implanted in a revision total hip arthroplasty model. Paired, fresh-frozen, cadaveric femora underwent resection of the proximal femur to simulate the proximal femoral bone loss often present during revision total hip arthroplasty and implantation with either a fluted, tapered stem or a clinically proven cylindrical stem. Specimens were then preloaded and subjected to a synchronous axial and torsional load with continuous monitoring of axial displacement and rotation.

Second-generation porous-coated cementless total hip arthroplasties have high survival.

We retrospectively reviewed 157 consecutive total hip arthroplasties performed with Prodigy stems and Duraloc cups to see whether design modifications made to these components would improve their clinical performance as compared with first-generation porous-coated components. At an average of 6.7 years postoperatively, 145 hips were available for followup.

Radiographic definition of pelvic osteolysis following total hip arthroplasty.

Background: Radiographs are the standard clinical tool used to monitor patients with pelvic osteolysis after total hip arthroplasty; however, previous reports have questioned the value and accuracy of this method. With use of a cadaveric model, we investigated the accuracy of radiographs in determining the location and size of periacetabular osteolysis.

Methods: We implanted total hip arthroplasty components in eight cadaveric hips and made four radiographs of each hip from different views.

Results of porous-coated anatomic total hip arthroplasty without cement at fifteen years: a concise follow-up of a previous report.

The purpose of this study was to update the results of a prospective series of primary cementless total hip arthroplasties after a minimum of fifteen years of follow-up. It is one of the first studies of cementless total hip arthroplasties followed for a minimum of fifteen years. One hundred consecutive Porous Coated Anatomic (PCA) total hip replacements were implanted between October 1983 and January 1986.

Osteoporosis and anterior femoral notching in periprosthetic supracondylar femoral fractures: a biomechanical analysis.

Background: This biomechanical study was designed to evaluate the predictive ability of dual-energy x-ray absorptiometry, cortical bone geometry as determined with computed tomography, and radiography in the assessment of torsional load to failure in femora with and without notching.

Methods: Thirteen matched pairs of cadaveric femora were randomized into two groups: a notched group, which consisted of femora with a 3-mm anterior cortical defect, and an unnotched group of controls. Each pair then underwent torsional load to failure.