Cruciate-retaining knee prosthesis

A technology of prosthesis and parts, applied in the field of cross-retained knee prosthesis, can solve problems such as delamination, loosening, and inability to support high torsional loads of active patients, and achieve the effect of large stiffness

Active Publication Date: 2012-12-12
SMITH & NEPHEW INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 deg

Method used

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  • Cruciate-retaining knee prosthesis
  • Cruciate-retaining knee prosthesis
  • Cruciate-retaining knee prosthesis

Examples

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Embodiment Construction

[0113] The following description is merely exemplary in nature of some selected variants and is not intended to limit the invention, its application or uses.

[0114] 1. Tibial base component

[0115] Figure 1-46 and 97-98 illustrate various non-limiting variations of tibial base components, some of their features are discussed below.

[0116] Figure 1-3 The underside of the tibial base component of the first variation is shown. Generally, the base member 10 includes an inner portion 12a, an outer portion 12b, and a connecting portion 12c. In this particular variant, the base member 10 has an asymmetrical shape in some respects. For example, if image 3 As shown in , the medial portion 12a is larger than the lateral portion 12b and aspects of the medial portion 12a extend further forward relative to the lateral portion 12b. In other variations, the base member may exhibit other asymmetry or may be symmetric.

[0117] Figure 1-3 The base member 10 includes lips 15a and...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): A61F2/38A61F2/30
CPCA61F2002/30884A61F2/38A61F2002/30616A61F2/3859A61F2/389A61F2002/3895A61F2002/2892A61F2002/30326A61F2002/30324A61F2002/30688A61F2002/30604A61F2002/30535
Inventor N.M.伦滋R.M.史密斯Z.C.维基森B.W.麦金农A.B.萨勒希J.K.內森M.D.里伊斯G.J.杰里
Owner SMITH & NEPHEW INC
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