Patent ID: 7169186

Claim:
A cut away monopolar constrained acetabular liner system with constraining ring assembly comprising: a cut away monopolar acetabular liner for enclosing a femoral head, wherein the liner has a rim that creates an orifice, wherein the orifice has a diameter that is smaller than the diameter of the femoral head, wherein a constraining ring is used with the cut away monopolar constrained acetabular liner, wherein the constraining ring contains at least one positioned recess that is compatible with the corresponding liner, wherein the recess facilitates increased range of motion in a desired direction, wherein the constraining ring fits around the perimeter of the constrained acetabular liner, wherein the constraining ring is fastened directly to the acetabular liner, and wherein the constraining ring is set onto the acetabular liner during the operative procedure after the femoral head is reduced into the acetabular liner.