FIXED-BEARING KNEE PROSTHESIS HAVING INTERCHANGEABLE COMPONENTS

• Main Authors: MEIER, RUSTY T, HELDRETH, MARK A, HAZEBROUCK, STEPHEN A, BRYANT, JACK T, DEFFENBAUGH, DAREN L
• Format: Patent
• Language: English
• Published: 30.07.2015
• Subjects: BANDAGES, DRESSINGS OR ABSORBENT PADS; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; FILTERS IMPLANTABLE INTO BLOOD VESSELS; FIRST-AID KITS; FOMENTATION; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PROSTHESES; TREATMENT OR PROTECTION OF EYES OR EARS

A fixed-bearing knee prosthesis (10), including: a tibial tray (14) having a platform (18) with a fixation member (20) extending downwardly from a lower surface (22) thereof, the platform having (i) a generally Y-shaped posterior 5 buttress (44) extending upwardly from an upper surface (24) of the platform and having a pair of arms (46, 48) extending along a posterior section of a perimeter of the platform, each of the pair of arms having an undercut (54, 56) defined therein, and (ii) an anterior buttress (64) extending along an anterior section of the perimeter of the platform and extending upwardly from the upper surface of the platform; and a 10 bearing (16) including a lower surface (36) having at least one recess (78, 80) defined therein to receive the posterior buttress and the anterior buttress, and a pair of posterior locking tabs (40) arranged to be respectively received in the undercuts defined in each of the pair of arms of the posterior buttress; wherein: a femoral component (12) having a medial condyle surface (32) and a lateral condyle surface 15 (30) is provided; and the knee prosthesis includes a plurality of the said bearings (16) configured to be separately secured to the tibial tray, wherein each of the plurality of bearings has (i) a width that is different from at least some of the other of the plurality of bearings, (ii) an upper surface having a medial bearing surface (28) configured to articulate with the medial condyle surface of the femoral component 20 and a lateral bearing surface (26) configured to articulate with the lateral condyle surface of the femoral component. 13/10/14,ag 22128 abstract,1 -4 4 5 4 4 Fig.1