The General Hospital Corporation

Massachusetts General Hospital Corporation

Daniel P Hoeffel

William H Harris

Brian R Burroughs

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

Monopolar constrained acetabular component

The present invention provides monopolar acetabular liners () that can enclose a femoral head () to form a hip replacement prosthesis (), 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 (), and wherein the liner () encompasses greater thanpercent of the volume of the head (), wherein a constraining ring () can be used in conjunction with the monopolar constrained acetabular liner () to provide additional support for the femoral head () to stay with the acetabular liner () and avoid dislocation. Assemblies and complete prosthetic replacements are also provided. Liners () and constraining rings () having no, one or more recesses () also are provided.

The present invention provides monopolar acetabular liners that can enclose a femoral head to form a hip replacement prosthesis, 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, and wherein the liner encompasses greater than 50 percent of the volume of the head, wherein a constraining ring can be used in conjunction with the monopolar constrained acetabular liner to provide additional support for the femoral head to stay with the acetabular liner and avoid dislocation. Assemblies, complete prosthetic replacements, and methods of replacing also are provided. Liners and constraining rings having no, one or more recesses also are provided.

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Woodbury, MN, United States of America

Daniel P Hoeffel