Zimmer Gmbh

Wright Medical Technology, Inc.

Kevin B Hayes

Stephen Edward White

Irina A Timmerman

Michael Earl Kaufman

Dennis J Buchanan

Robert D Paxson

A knee prosthesis for replacing at least a portion of a knee joint between the distal end of a femur and the proximal end of a tibia. The knee prosthesis includes a tibial component for mounting to the proximal end of the tibia, the tibial component including a proximal surface having a semispherical medial cavity and a lateral cavity; and a femoral component for mounting to the distal end of the femur, the femoral component including a semispherical medial condylar portion for pivotally coacting with the semispherical medial cavity of the tibial component and including a semispherical lateral condylar portion for movably coacting with the lateral cavity of the tibial component; the semispherical medial condylar portion being substantially congruent with the semispherical medial cavity of the tibial component so that substantially complete surface-to-surface contact between the semispherical medial cavity of the tibial component and the semispherical medial condylar portion of the femoral component is provided throughout the range of flexion of the knee joint.

Medial pivot knee prosthesis

Ribbed augment for a prosthetic implant

An augment for an orthopaedic implant contains a countersunk through hole. A fixation means interacts with the countersink to produce both downward and lateral forces on the augment. As the fixation means is tightened, it abuts one side of the countersink so that it exerts both a downward force and a lateral force on the augment. The lateral force causes the augment to press tightly against the implant. Because of the combination of downward and lateral forces, the augment strongly resists displacement and rotation.

Augmentation for an orthopaedic implant

An orthopaedic base component and an augmentation block, such as a provisional tibial component 2, which includes an attachment mechanism that ensures that the augmentation block 30 can not inadvertently shift about or disconnect from the tray component 10. The attachment mechanism uses a button 40 and 'key hole' shaped opening 20 to attach augmentation block 30 to tray component 10. The 'key hole' opening is formed in the distal surface 14 of tray component 10. The 'key hole' configuration is formed by an elongated slot 21 and a circular bore 23. Two oppositely facing protuberances 26 extend into the posterior end of each slot 21 from the peripheral side walls 22, which define the slot. Button 40 extends transversely from the proximal surface 34 of the augmentation block 30 and includes a substantially rectangular neck 42 and a flat circular head 44. Neck 42 has an indentation 43 formed on two opposed sides. Button 40 is securely held at the posterior end of slot 21 by protuberances 26, which are restrictively seated within the 43 in neck 42.

Orthopaedic base component with modular augmentation block

A prosthetic joint implant for replacing a portion of a bone having a base member 10 with a first surface 11 for positioning toward a surface of the bone. The first surface 11 includes a shallow recessed portion 13 and a raised peripheral rim 14 at an outer edge 15 of the recessed portion. The joint implant 1 further includes a separate augment member 40 having a first face 41 adapted to be selectively positioned against the first surface 11 of base member 10. The first face 41 includes a peripheral outer edge 43 thereabout and an elongated raised rib 44 having an outer shoulder 45 which abuts an inner shoulder 16 of raised rim 14 of base member 10. The raised rib 44 of augment member 40 extends only about halfway or less around the peripheral outer edge 43 of augment member 40. The raised rib 44 provides resistance to shear forces that act toward the direction of the rib 44 positioned along an outer side of the base member 10 when the augment member is connected thereto.

Growing community of inventors

Cordova, TN, United States of America

Kevin B Hayes