Howmedica Osteonics Corporation

Sandeep K Chauhan

Alex F Canonaco

Michael J Cusick

Carlos E Collazo

Michael C Ferko

Philip F Williams, Iii

Peter John Wellings

Jerry D'Alessio, Ii

A femoral implant for articulation with a patella or a patellar implant includes a body having an articular surface defining a trochlear groove. The trochlear groove is defined by a first trochlear radius at a first location along the trochlear groove and by a second trochlear radius at a second location along the trochlear groove, the first radius being different than the second radius. The configuration of the trochlear groove is such that it narrows as a patella or patellar implant moves from an extension configuration to a flexion configuration. A kit includes the femoral implant along with a patellar implant. A method of trialing involves use of the femoral implant or kit to ensure a smooth transition of the patella or the patellar implant from the femoral component to the adjacent bone.

Patellofemoral implant

An improved resection guide and method using same are disclosed. The guide is preferably utilized in resecting the tibia during either a single or double unicondylar type procedure. Preferably, the guide allows for linked resection of the tibia while also being capable of conforming to many different patient sizes. This may also allow for a more precise resection to be accomplished.

Linked tibial resection guide

A multi-piece knee resection instrument for use in forming an anterior cut, an anterior chamfer cut, a posterior cut and a posterior chamfer cut on a distal femur which has already had a distal surface thereof resected which cuts are for the mounting of a prosthetic implant, has a first resection guide for attachment to the medial or lateral side of the distal femur. The first resection guide has a first surface facing generally anteriorly when mounted and a second surface extending distally from the first surface and angled thereto and a third surface extending generally parallel to the resected distal surface of the femur. A second resection guide is mounted on the first and second surfaces of the first resection guide for performing the anterior and anterior chamfer cuts. A third resection guide is mounted on the third surface of the first resection guide and extends in a medial-lateral direction therefrom across at least part of the resected distal femoral surface.

Navigated lateral/medial femoral resection guide

Instruments and a method for preparing the articular surface of the patella to receive a patellar implant are utilized without everting the patella. A medial or lateral parapatellar incision and an anterior midline incision are made adjacent the patella. The patella is clamped with a patella clamp, a hole is drilled from the anterior surface of the patella. A reamer is inserted through the medial or lateral parapatellar incision and is then attached to the end of a drive shaft that extends outwardly beyond the articular surface of the patella. The posterior facing cutting surface of the reamer device is then placed in contact with the articular surface. The drive shaft is then rotated and moved anteriorly causing the cutting surface of the reamer device to remove a desired amount of patellar cartilage and bone to accommodate a patellar component. The patellar component is secured into place by aligning a central peg protruding from the top surface of the patellar component with the previously drilled hole in the patellar remnant.

Growing community of inventors

Plumpton Green, United Kingdom

Sandeep K Chauhan