Reverse total hip replacement
OwnerNicholas John Loffredoinventor
Life of this patent
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Abstract
A reverse total hip prosthesis is characterized by a femoral cup component and an acetabular ball component and is used for reconstruction of a hip joint. The prosthesis reverses the mechanics across the joint medializing the center of rotation, preventing dislocation in a posterior direction. Both ball and socket portions of the components lie outside of bone enabling larger sizing of the femoral and acetabular components improving stability, regardless of the size of the patient's anatomy. A method for reverse hip prosthesis implantation eliminates reaming through the base of the acetabulum preserving acetabular bone stock.
Claims12
A reverse hip replacement prosthesis device comprising:
- a femoral component having a femoral stem portion that is configured for fitting into a human femur and supports a femoral cup portion attached to a saucer-shaped spacer;
- and
- an acetabular component having:
- (i) an acetabular base formed as a spherical segment having a spherical interface surface that extends between a first flat surface and a second flat surface parallel to the first flat surface, wherein a central barrel having a keyed depression extends from the second flat surface,
- and wherein the acetabular base includes one or more tunnels formed through the spherical interface surface that define an anterior-to-posterior orientation for fastening the acetabular base to a patient's acetabulum;
- (ii) a hemispheric acetabular ball that is sized for articulating contact with the saucer-shaped spacer and featured for engagement with the central barrel.
A reverse hip replacement prosthesis device comprising:
- a femoral component having a femoral stem portion that is configured for fitting into a femoral neck and supports a femoral cup portion attached to a saucer-shaped spacer;
- and
- an acetabular component having:
- (i) an acetabular base formed as a spherical segment having a spherical interface surface that extends between a first flat surface and a second flat surface parallel to the first flat surface, wherein a central barrel having a keyed depression extends from the second flat surface,
- and wherein the acetabular base includes one or more tunnels that extend through the spherical interface surface and that define an anterior-to-posterior orientation for fastening the acetabular base to a patient's acetabulum;
- (ii) a hemispheric acetabular ball that is sized for articulating contact with the spacer and featured for engagement with the central barrel by a tapered fitting.
Dependencies are inferred from the claim text.