Christopher R Patrick

US Patent:

6660039, Dec 9, 2003

Filed:

Jan 29, 2002

Appl. No.:

10/060014

Inventors:

David Lee Evans - Bartlett TN
Greg Marik - Germantown TN
Christopher Patrick - Memphis TN
Albert J. Pothier - Memphis TN

Assignee:

Smith Nephew, Inc. - Memphis TN

International Classification:

A61F 230

US Classification:

623 2029

Abstract:

A mobile bearing knee prosthesis enables a surgeon to convert a mobile bearing insert having articular surfaces, supported by a tibial base plate or tray from a rotating and translating prosthesis to one that rotates only. This conversion is accomplished with a fastener or locking member that connects through an opening in the insert to the tibial base plate. This prosthesis can be used as part of a total knee surgery when the surgeon chooses to use a prosthesis that incorporates a movable articular surface. In one embodiment, a projecting portion extends proximally from the insert and cooperates with a cam on the femoral component. The projecting portion can be a post extending up from the proximal surface of the insert and the femoral component includes an intercondylar surface that may contact the post to constrain the relative motion between the femoral component and the insert. In another embodiment, the insert is a two part assembly that includes a larger member with a central opening and a smaller member that fits the opening.