POSTERIOR STABILIZED ORTHOPAEDIC KNEE PROSTHESIS HAVING CONTROLLED CONDYLAR CURVATURE

• Main Authors: WILLIAMS JOHN L, LEE JORDAN S, GOMAA SAID T, ARMACOST JOHN M, SOKOLOV DIMITRI, WAGNER CHRISTEL M, WYSS JOSEPH G
• Format: Patent
• Language: English
• Published: 21.01.2010
• 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

PROBLEM TO BE SOLVED: To solve the problem that paradoxical anterior translation can occur at nearly any degree of flexion, particularly at mid to late degrees of flexion, in a typical orthopaedic knee prosthesis. SOLUTION: The orthopaedic knee prosthesis includes a tibial bearing and a femoral component configured to articulate with the tibial bearing. The femoral component includes a posterior cam configured to come into contact with the spine of the tibial bearing and a condyle surface curved in a sagittal plane. The radius of curvature of the condyle surface decreases gradually between early-flexion and mid-flexion. Additionally, in some embodiments, the radius of curvature of the condyle surface can be increased during mid-flexion. COPYRIGHT: (C)2010,JPO&INPIT