Monopolar constrained acetabular component

摘要

The present invention provides monopolar acetabular liners (32, 54) that can enclose a femoral head (14) to form a hip replacement prosthesis (30, 50), wherein the liner (32, 54) has a rim (34) that creates an orifice, wherein the orifice has a diameter that is smaller than the diameter of the femoral head (14), and wherein the liner (32, 54) encompasses greater than 50 percent of the volume of the head (14), wherein a constraining ring (56) can be used in conjunction with the monopolar constrained acetabular liner (32, 54) to provide additional support for the femoral head (14) to stay with the acetabular liner (32, 54) and avoid dislocation. Assemblies and complete prosthetic replacements are also provided. Liners (32, 54) and constraining rings (56) having no, one or more recesses (36) also are provided.

主权项

1. A metallic constraining ring that fastens directly to a cut-away monopolar constrained acetabular liner, wherein the constraining ring has at least one positioned recess that is compatible with at least one recess on the cut-away monopolar constrained acetabular liner that comprises cross-linked ultrahigh molecular weight polyethylene, wherein the metallic constraining ring fits around the perimeter of the cut-away monopolar constrained acetabular liner, and wherein the metallic constraining ring is set onto the cut-away monopolar constrained acetabular liner during the operative procedure after the femoral head is reduced into the cut-away monopolar constrained acetabular liner, wherein following the operative procedure the metallic constraining ring is not impinged by a femoral neck, wherein at least one recess can be positioned to increase range of motion.