Cruciate-retaining knee prosthesis

Abstract

Certain versions generally provide an improved tibial base member (for example, but not limited to, 10) comprising keel portions (for example, but not limited to, 14a, 14b, 14c) that allow one or both cruciate ligaments to be preserved. Other versions provide improved lateral and / or medial inserts (for example, but not limited to, 110, 210) having a mesial lip (for example, but not limited to, 118, 128) that helps relieve and / or prevent impingement between the femoral component (for example, but not limited to, 400) and the tibial eminence. Other versions provide improved femoral components (for example, but not limited to, 400) having various chamfers (for example, but not limited to, 404, 410, 470) to provide additional clearance with respect to the tibial eminence and posterior cruciate ligament without decreasing bone coverage.

Description

[0001] Cross References to Related Applications [0002] This application claims U.S. Provisional Application Serial No. 61 / 372,556, filed August 11, 2010, entitled "Cruciate-Retaining Knee Prosthesis," U.S. Provisional Application Serial No. 61 / 372,556, filed September 13, 2010, entitled Application Serial No. 61 / 382,287 and priority to US Provisional Application Serial No. 61 / 299,835, filed January 29, 2010, entitled "Bi-Cruciate Retaining Tibial Implant," the contents of all three are incorporated herein by reference. technical field [0003] Prostheses used in knee arthroplasty, such as tibial and / or femoral implants, may in some cases facilitate retention of one or both of the cruciate ligaments. Background technique [0004] In total knee arthroplasty, the conventional approach is to resect the entire proximal tibia to create a platform surface on which a tibial base prosthesis can be implanted. Such conventional resection techniques typically sacrifice one or both of...

AI Technical Summary

Problems solved by technology

The thin anterior bridge may not be able to support the high torsional loads experienced by active patients, and past implants have been known to eventually bend or shear in half over time, requiring early revision surgery

The slight bending and shearing to which even such prior art devices are subjected can degrade performance and eventually cause the implant to loosen or delaminate from the bone on either or both of the medial and lateral sides

[0009] Other problems with existing double-crucifix designs include fractures of the bone near the area that connects the ACL to the tibia (i.e., the anterior tibial eminence)

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