Patent ID: 7972383
Filing Date: 2011-07-05
Classification: A61F

Abstract:
1. An orthopaedic implant, comprising: a patella component having (i) a posterior bearing surface configured to articulate with the femoral condyles of a femur, and (ii) an anterior surface having a number of pegs extending outwardly therefrom, wherein, when viewed in a cross sectional view taken in the superior/inferior direction, the posterior bearing surface has (i) a curved peak surface that defines the posterior-most surface of the patella component, (ii) a flat inferior surface that extends inferiorly away from the curved peak surface, (iii) a rounded inferior edge surface that extends inferiorly away from the flat inferior surface in the direction toward the anterior surface of the patella component, (iv) a flat superior surface that extends superiorly away from the curved peak surface, and (v) a rounded superior edge surface that extends superiorly away from the flat superior surface in the direction toward the anterior surface of the patella component, wherein the rounded superior edge surface comprises (i) a curved corner surface connected to the flat superior surface, and (ii) a flat surface that connects the curved corner surface to the anterior surface of the patella component, wherein (i) a first imaginary line extends along the flat inferior surface and defines a first tangent point at the transition of the flat inferior surface and the rounded inferior edge surface, (ii) a second imaginary line extends along the flat superior surface and defines a second tangent point at the transition of the flat superior surface and the rounded superior edge surface, (iii) a first imaginary line segment extends orthogonally from the anterior surface of the patella component to the first tangent point, (iv) a second imaginary line segment extends orthogonally from the anterior surface of the patella component to the second tangent point, and (v) the second imaginary line segment is longer than the first imaginary line segment, wherein when viewed in a cross sectional view taken in the medial/lateral direction, the posterior bearing surface has (i) a flat medial surface that extends medially away from the curved peak surface, (ii) a rounded medial edge surface that extends medially away from the flat medial surface in the direction toward the anterior surface of the patella component, (iii) a flat lateral surface that extends laterally away from the curved peak surface, and (iv) a rounded lateral edge surface that extends laterally away from the flat lateral surface in the direction toward the anterior surface of the patella component, and wherein (i) a third imaginary line extends along the flat medial surface and defines a third tangent point at the transition of the flat medial surface and the rounded medial edge surface, (ii) a fourth imaginary line extends along the flat lateral surface and defines a fourth tangent point at the transition of the flat lateral surface and the rounded lateral edge surface, (iii) a third imaginary line segment extends orthogonally from the anterior surface of the patella component to the third tangent point, (iv) a fourth imaginary line segment extends orthogonally from the anterior surface of the patella component to the fourth tangent point, and (v) the third imaginary line segment is equal in length to the fourth imaginary line segment.