Other

Mayo Foundation for Medical Education and Research

Smith & Nephew Richards Inc.

Johnson & Johnson Orthopaedics, Inc.

James A Rand

Jennifer J Lackey

Jeffrey G Roberts

Ramon B Gustilo

Richard D Scott

Thomas B Buford, Iii

William H Hoffman

A hip prosthesis is disclosed which employs a number of cement spacers located on the surface of the stem of the prosthesis immediately below a collar which makes direct and parallel contact with calcar bone when a stem of the prosthesis is seated in medullary canal of the patient. The collar is constructed to provide even stress distribution to the bone.

Hip prosthesis

A plurality of various shaped wedges, each wedge having an upper and lower face, each face including a plurality of spaced aligned protrusions adapted to engage a plurality of channels formed in the under surface of the tibial base, the protrusions registering with the channels to allow positioning of the wedge relative to the shape of the tibial component in various positions along the edge of the component, so that the plurality of wedges may be positioned to align themselves with the edge of the tibial component, and therefore in addition to providing a spacer between the bone and the undersurface of the component, to be secured within the same confined area as the component.

System of inserts for the tibial component of a knee prosthesis

A femoral component base having a pair of laterally spaced apart condylar portions, each of which has an external surface that is smoothly convexly curved anterior-posteriorly to match generally the distal profile of the anatomical femoral condyle and smoothly convexly curved laterally throughout its antero-posterior extent. The external convexly curved surfaces engage the tibial component having a platform portion laterally with spaced apart concavities, each of which would receive one of the condylar portions of the femoral component to allow antero-posterior rotation between the components during use of the joint. The femoral component includes a modular member having adjustable plates for adjusting the position of the femoral component in response to the bone condition discovered during surgery. The tibial, femoral and modular components further include a triangular, ramp post and corresponding confined recess to limit flexion and undesirable lateral movement.

Modular knee joint prosthesis

Growing community of inventors

Rochester, MN, United States of America

James A Rand