# US 9,750,613 B2 · Stabilized total ankle prosthesis > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,750,613 B2 - Document ID: US9750613B2 - Status: Granted - Kind: B2 - Application number: 13/674,504 - Filed: 2012-11-12 - Published: 2014-05-15 - Granted: 2017-09-05 - Earliest claimed: 2012-11-12 - Assignees: Wright Medical Technology, Inc. - Applicants: Wright Medical Technology, Inc. - Inventors: Christine M. Petteys - Web page: https://patentgrep.com/patent/US9750613B2 ## CPC - A61F 2/4202: {for ankles} - A61F 2/30767: {Special external or bone-contacting surface, e.g. coating for improving bone ingrowth} - A61F 2002/2892: {Tibia} - A61F 2002/30003: {Material related properties of the prosthesis or of a coating on the prosthesis} - A61F 2002/30004: {the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis} - A61F 2002/30011: {differing in porosity} - A61F 2002/3011: {Cross-sections or two-dimensional shapes} - A61F 2002/30116: {partial circles, i.e. circular segments} - A61F 2002/30123: {with two diametrically opposed lobes} - A61F 2002/3013: {figure-"8"- or hourglass-shaped} - A61F 2002/30164: {dovetail-shaped} - A61F 2002/30387: {Dovetail connection} - A61F 2002/30574: {with an integral complete or partial collar or flange} - A61F 2002/3065: {Details of the ball-shaped head} - A61F 2002/30654: {Details of the concave socket} - A61F 2002/30662: {with rotation-limiting means} - A61F 2002/30878: {with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts} - A61F 2002/30889: {Arcuate pegs} - A61F 2002/4205: {Tibial components} - A61F 2002/4207: {Talar components} - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) ## Abstract The present invention relates to a stabilized ankle prosthesis configured for use in patients with compromised soft tissue in the ankle. The prosthesis of the present invention is a two-component design comprising a stabilizing lip configured to constrain movement in the general direction of compromised soft tissue. ## Claims ### Claim 1 An ankle prosthesis comprising: an attachment surface on a proximal portion adapted to fit into a recess in a resected tibia, and an articulation surface on a distal portion, the body having two side surfaces which angle toward each other such that the articulation surface is wider than the attachment surface; a talar component configured for attachment to a talus, comprising a flat attachment surface on a distal portion and an articulation surface on a proximal portion; wherein the articulation surface of the tibial component comprises a medial portion and a lateral portion, the medial portion having a first convex contour, the lateral portion having a second convex contour, wherein a first concave contour is located between the first and second convex contours; wherein the articulation surface of the talar component comprises a medial portion and a lateral portion, the medial portion having a second concave contour, the lateral portion having a third concave contour, wherein a third convex contour is located between the second and third concave contours, and the articulation surface of the talar component is configured to complement the articulation surface of the tibial component; and wherein the articulation surface of the talar component comprises a lip configured to maintain congruence of the articulation surface of the tibial component with the articulation surface of the talar component, wherein the lip comprises raised surfaces curving around each of the medial portion of the articulation surface of the talar component, the lateral portion of the articulation surface of the talar component, a posterior edge of the articulation surface of the talar component and an anterior edge of the articulation surface of the talar component, forming a cup-like contour. ### Claim 2 (depends on 1) The ankle prosthesis of claim 1, wherein the raised surface on the medial portion of the articulation surface of the talar component is in superior relation to the third convex contour of the articulation surface of the talar component and is configured to limit eversion. ### Claim 3 (depends on 1) The ankle prosthesis of claim 1, wherein the raised surface on the lateral portion of the articulation surface of the talar component is in superior relation to the third convex contour and is configured to limit inversion. ### Claim 4 (depends on 1) The ankle prosthesis of claim 1, wherein the raised surface on the medial portion of the articulation surface of the talar component is in superior relation to the third convex contour and is configured to limit eversion, and the raised surface on the lateral portion of the articulation surface of the talar component is in superior relation to the third convex contour and is configured to limit inversion. ### Claim 5 (depends on 1) The ankle prosthesis of claim 1, wherein the lip is configured to limit posterior displacement of the tibial component. ### Claim 6 (depends on 1) The ankle prosthesis of claim 1, wherein the lip is configured to limit anterior displacement of the tibial component. ### Claim 7 (depends on 1) The ankle prosthesis of claim 1, wherein the lip comprises a first raised surface on the posterior edge of the articulation surface of the talar component, wherein the first raised surface is configured to limit posterior displacement of the tibial component, and a second raised surface on the anterior edge of the articulation surface of the talar component, wherein the second raised surface is configured to limit anterior displacement of the tibial component. ### Claim 8 (depends on 1) The ankle prosthesis of claim 1, wherein one of the raised surfaces of the lip of the articulation surface of the talar component extends from a medial edge curving posteriorly to a lateral edge and continuing around returning to the medial edge, wherein the lip is configured to provide stability to the prosthesis. ### Claim 9 (depends on 1) The ankle prosthesis of claim 1, wherein the articulation surface of the tibial component is comprised of a first material and the articulation surface of the talar component is comprised of a second material. ### Claim 10 (depends on 9) The ankle prosthesis of claim 9, wherein the first and second material are substantially the same. ### Claim 11 (depends on 9) The ankle prosthesis of claim 9, wherein the first and second material are substantially different. ### Claim 12 (depends on 1) The ankle prosthesis of claim 1, wherein the tibial component has a bicondylar contour. ### Claim 13 An ankle prosthesis comprising: a tibial component configured for attachment to a tibia, comprising an attachment surface on a proximal portion of the tibial component and an articulation surface on a distal portion of the tibial component, wherein the articulation surface of the tibial component has a bicondylar contour comprising a medial portion and a lateral portion, the medial portion having a first convex contour, the lateral portion having a second convex contour, wherein a first concave contour is located between the first and second convex contours; a talar component comprising a proximal portion and a distal portion, wherein: the proximal portion of the talar component has an articulation surface and a trapezoid-shaped projection opposite the articulation surface, the distal portion of the talar component has an attachment surface configured for attachment to a talus, the distal portion of the talar component having a trapezoid-shaped groove opposite the attachment surface, the trapezoid-shaped groove configured to slidably receive the trapezoid-shaped projection of the proximal portion of the talar component, the articulation surface of the talar component is configured to complement the bicondylar contour of the tibial component and comprises a medial portion and a lateral portion, the medial portion having a second concave contour, the lateral portion having a third concave contour, wherein a third convex contour is located between the second and third concave contours, and the articulation surface of the talar component comprises a lip having raised surfaces curving around each of the medial portion of the articulation surface of the talar component, the lateral portion of the articulation surface of the talar component, a posterior edge of the articulation surface of the talar component and an anterior edge of the articulation surface of the talar component, forming a cup-like contour. ### Claim 14 (depends on 13) The ankle prosthesis of claim 13, wherein the attachment surface of the tibial component and the attachment surface of the distal portion of the talar component comprise pores adapted to promote osseointegration. ### Claim 15 (depends on 13) The ankle prosthesis of claim 13, wherein the articulation surface of the talar component comprises a first material, the attachment surface of the talar component comprises a second material, and the first material and second material are different from each other. ### Claim 16 (depends on 13) The ankle prosthesis of claim 13, wherein the trapezoid-shaped projection is wider at a distal side of the projection than at a proximal side of the projection.