Smith + Nephew

Michael A Croxton

Charles Wayne Allen

William L Waltersdorff

Jeffrey Joel Shea

Terry W McLean

Jason A Capriotti

Roger William Frank Ashton

Justin M Waugh

Sureshkumar Srinivasan

Brian William McKinnon

David C Kelman

Roger William Ashton

Terry W Mclean

A modular acetabular cup assembly for use with multiple bearing liners is disclosed. The acetabular cup assembly includes a shell having a tapered inner wall and two circumferential grooves. The shell may be used with polyethylene, ceramic, metal, and other types of liners.

Acetabular cup assembly for multiple bearing materials

A modular acetabular cup assembly () for use with multiple bearing liners () is disclosed. The acetabular cup assembly includes a shell () having a tapered inner wall () and two circumferential grooves (). The shell () may be used with polyethylene, ceramic, metal, and other types of liners.

A method for forming an implant for a bone including the steps of generating a first general shape for the implant having a length extending along a long axis of the bone, determining an area moment of inertia of a cross section of the implant, determining an area moment of inertia for a cross section of bone coplanar to the cross section of the implant, calculating a percent stress shielding from the area moments of inertia of the implant and the bone, comparing the calculated percent stress shielding to a preset threshold, and iteratively generating additional general shapes for the implant by locally adjusting the cross section of the implant until the calculated percent stress shielding meets the preset threshold.

Variable stiffness stem for prosthetic implants

There is provided an acetabular shell liner, and particularly a constrained liner, having a variable rim surface geometry to improve the range of motion of a femoral component within the liner and decrease the incidence of dislocation and subluxation. There are also provided methods of making and using the acetabular shell liner. Prosthetic devices, and particularly hip joint prostheses, containing the acetabular shell liner having a variable rim surface geometry are also provided.

Variable geometry rim surface acetabular shell liner

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The Woodlands, TX, United States of America

Michael A Croxton