Depuy Products, Inc.

Depuy Orthopaedics, Inc.

Marc Weissman

Thomas S Camino

J Brock VanMeter, Jr

Jon C Serbousek

Larry G McCleary

Farid Bruce Khalili-Araghi

David R Tuttle

Thomas S Thornhill

Thomas P Schmalzried

Daniel J Berry

Thomas M Vanasse

John Callaghan

David Fisher

A prosthetic trial for a joint prosthesis includes a stem having a proximal section and a distal section for implantation in a bone. A body includes a channel receiving at least the proximal section of the stem. A locking mechanism is at least partially disposed within the body. The locking mechanism is biased into a locking position in which the mechanism locks the stem within the first channel of the body. The locking mechanism is accessible outside said body to be pulled into a releasing position to unlock the stem from the body.

Modular trial mechanism

A articulating hemiarthroplasty prosthesis () for use in arthroplasty is provided. The prosthesis includes a stem () for implantation at least partially within the medullary canal () of a long bone () and a collar (). The collar () is operably associated with the stem () and extends outwardly therefrom. At least a portion of the collar () includes a resorbable material. The prosthesis includes a head () and a cup () for engagement with the head ().

Prosthesis with resorbable collar

A ball and socket joint prosthesis for use in arthroplasty is provided. The prosthesis includes a body for implantation at least partially within the medullary canal of a long bone. The long bone defines trabeculae in the proximal cancellous bone and lamellae in the cortical bone. The body includes a proximal portion thereof and a distal portion. The proximal portion has a medial periphery and includes surface features on a substantial portion of its proximal portion. The surface features are positioned to optimally transfer load from the prosthesis to the long bone.

Prosthesis with feature aligned to trabeculae

A modular trial neck segment is utilized for trialing a hip prosthesis for a total hip arthroplasty. The modular trial neck segment is preferably, but not necessarily, utilized for trialing a hip prosthesis for a total hip arthroplasty. The trial neck segment includes a mount attachable to a stem or broach, and a neck that is translatable on the mount for providing various neck offsets with respect to the mount and/or broach. Neck offset is changed via movement of the neck in a single plane of motion. This facilitates the use of the subject invention in minimally invasive arthroplasty wherein working dimensions are small. The present design replicates the biomechanics of the neck region of the implant. The mount and slidable neck provide a plurality of neck offsets and/or neck lengths for trialing a final prosthesis in a single device.

Modular trial neck segment

A ball and socket joint prosthesis ( ) for use in arthroplasty is provided. The prosthesis includes a body ( ) for implantation at least partially within the medullary canal ( ) of a long bone ( ). The long bone defines trabeculae ( ) in the proximal cancellous bone ( ) and lamellae ( ) in the cortical bone ( ). The body includes a proximal portion ( ) thereof and a distal portion ( ). The proximal portion has a medial periphery ( ) and includes surface features ( ) on a substantial portion of its proximal portion. The surface features are positioned to optimally transfer load from the prosthesis to the long bone.

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Warsaw, IN, United States of America

Marc Weissman