# US 8,771,364 B2 · Tibial tray having a reinforcing member > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,364 B2 - Document ID: US8771364B2 - Status: Granted - Kind: B2 - Application number: 12/253,259 - Filed: 2008-10-17 - Published: 2010-04-22 - Granted: 2014-07-08 - Earliest claimed: 2008-10-17 - Assignees: Biomet Manufacturing, LLC - Applicants: Brian M. May; Mukesh Kumar - Inventors: Brian M. May; Mukesh Kumar - Web page: https://patentgrep.com/patent/US8771364B2 ## CPC - A61F 2/38: for elbows or knees - A61F 2002/30011: {differing in porosity} - A61F 2002/30367: {with additional means for preventing said rotation} - A61F 2002/30387: {Dovetail connection} - A61F 2002/3092: {having an open-celled or open-pored structure} - A61F 2002/3093: {for promoting ingrowth of bone tissue} - A61F 2220/0025: Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements - A61F 2220/0033: made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit - A61F 2250/0024: made from both porous and non-porous parts, e.g. adjacent parts - A61F 2310/00017: Iron- or Fe-based alloys, e.g. stainless steel - A61F 2310/00023: Titanium or titanium-based alloys, e.g. Ti-Ni alloys - A61F 2310/00029: Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium - A61F 2310/00131: Tantalum or Ta-based alloys - A61F 2310/00976: Coating or prosthesis-covering structure made of proteins or of polypeptides, e.g. of bone morphogenic proteins BMP or of transforming growth factors TGF - 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 A knee joint prosthesis can include a tibial component that can have a tibial tray. The tibial tray can include a platform-like tray that defines a superior surface and an inferior surface. The platform-like tray can have a tray perimeter and a raised wall formed on the inferior surface. The raised wall can be offset inboard relative to the tray perimeter. Porous material can be disposed on the inferior surface of the platform-like tray at a location generally between the raised wall and the tray perimeter. ## Claims ### Claim 1 A knee joint prosthesis comprising: a tibial component including a tibial tray, said tibial tray comprising: a platform-like tray having a superior bearing engaging surface and an inferior surface, said platform-like tray defining a tray perimeter and a first height measured between said superior bearing engaging surface and said inferior surface; a raised wall formed on and extending from said inferior surface of said platform-like tray, said raised wall offset inboard relative to said tray perimeter and configured to provide increased rigidity of said platform-like tray; and porous material disposed on said inferior surface of said platform-like tray at a location generally between said raised wall and said tray perimeter, said porous material having a second height measured between said inferior surface of said platform-like tray and a bone engaging surface of said porous material, said second height being greater than said first height; wherein said platform-like tray further comprises, a first support wall formed on said inferior surface and extending between a generally anterior/lateral position to a posterior/medial position. ### Claim 2 (depends on 1) The knee joint prosthesis of claim 1 wherein said raised wall is a closed wall that defines an outer profile that substantially matches said tray perimeter. ### Claim 3 (depends on 2) The knee joint prosthesis of claim 2 wherein said tibial component further comprises, a stem that extends inferiorly from said platform-like tray. ### Claim 4 (depends on 3) The knee joint prosthesis of claim 3 wherein said porous material is disposed in a location generally between said raised wall and said stem. ### Claim 5 (depends on 1) The knee joint prosthesis of claim 1 wherein said platform-like tray and said raised wall are integrally formed of solid biocompatible material selected from the group comprising metal, PEEK, fiber-reinforced PEEK and ceramic. ### Claim 6 (depends on 1) The knee joint prosthesis of claim 1 wherein said raised wall is perpendicular relative to a plane define by said platform-like tray and is configured to be aligned with cancellous bone and said porous material is configured to abut cortical bone in an implanted position. ### Claim 7 (depends on 1) The knee joint prosthesis of claim 1 wherein said platform-like tray further comprises, a second support wall formed on said inferior surface and extending between a generally anterior/medial position to a posterior/lateral position. ### Claim 8 (depends on 7) The knee joint prosthesis of claim 7 wherein said first and second support walls define a generally dove-tail cross-section. ### Claim 9 (depends on 1) The knee joint prosthesis of claim 1, further comprising: a femoral component; and a bearing selectively engageable with said tibial component. ### Claim 10 A knee joint prosthesis comprising: a tibial component including a tibial tray, said tibial tray comprising: a solid metal portion comprising: a platform-like tray having a superior bearing engaging surface and an inferior surface, said platform-like tray defining a tray perimeter; a stem extending inferiorly from said platform-like tray; a raised wall formed on said inferior surface and extending to a bone engaging end face, said raised wall offset toward said stem and defining a closed wall having a profile that is substantially equivalent to said tray perimeter around said inferior surface; and a porous metal portion comprising: a first porous metal portion disposed on said inferior surface of said platform-like tray outboard of said raised wall; a second porous metal portion disposed inboard of said raised wall, wherein said first and second porous metal portions are discontinuous at said bone engaging end face such that said bone engaging end face is free of porous metal and configured to directly engage bone; wherein said platform-like tray further comprises, first and second support walls formed on said inferior surface and extending radially therealong. ### Claim 11 (depends on 10) The knee joint prosthesis as claimed in claim 10 wherein said first porous metal portion is disposed from said raised wall to said tray perimeter. ### Claim 12 (depends on 10) The knee joint prosthesis as claimed in claim 10 wherein said second porous metal portion is disposed from said raised wall to said stem. ### Claim 13 (depends on 10) The knee joint prosthesis as claimed in claim 10 wherein said raised wall is configured to be aligned with cancellous bone and said first porous metal portion is configured to abut cortical bone in an implanted position. ### Claim 14 (depends on 10) The knee joint prosthesis of claim 10 wherein at least one of said first and second support walls defines a generally dove-tail cross-section. ### Claim 15 (depends on 10) The knee joint prosthesis of claim 10, further comprising: a femoral component; and a bearing selectively coupled to said tibial component.