TECHNICAL FIELD

The present disclosure relates generally to orthopaedic prosthetic components and, more particularly, to acetabular prosthetic components.

BACKGROUND

Joint arthroplasty is a well-known surgical procedure by which a diseased and/or damaged natural joint is replaced by a prosthetic joint. For example, in a hip arthroplasty surgical procedure, a patient's natural hip ball and socket joint is partially or totally replaced by a prosthetic hip joint. A typical prosthetic hip joint includes an acetabular prosthetic component and a femoral head prosthetic component. An acetabular prosthetic component generally includes an outer shell configured to engage the acetabulum of the patient and an inner bearing or insert coupled to the shell and configured to engage the femoral head. The femoral head prosthetic component and inner insert of the acetabular component form a ball and socket joint that approximates the natural hip joint.

SUMMARY

According to one aspect of the disclosure, an orthopaedic prosthesis for use in a hip arthroplasty surgical procedure is disclosed. The orthopaedic prosthesis includes an acetabular prosthetic component that has a cavity sized to receive a femoral head of a femoral prosthetic component. The cavity is defined by an inner wall that is shaped to resist dislocation of the femoral head of the femoral prosthetic component. In some embodiments, the inner wall of the acetabular prosthetic component may include a cylindrical surface extending inwardly from an outer rim of the acetabular prosthetic component to an inner end and a semi-spherical surface connected to the inner end of the cylindrical surface. In some embodiments, the cavity may be sized such that a geometric center of the femoral prosthetic component is positioned lateral of the outer rim of the acetabular prosthetic component when received in the cavity.

According to another aspect, an orthopaedic prosthetic component is disclosed. The orthopaedic prosthetic component comprises an acetabular prosthetic component including an outer rim, an inner wall extending inwardly from the outer rim, and a cavity defined by the inner wall. The cavity is sized to receive a femoral head of a femoral prosthetic component. The inner wall includes a cylindrical surface extending inwardly from the outer rim to an inner end, and a semi-spherical surface connected to the inner end of the cylindrical surface. When the acetabular prosthetic component is viewed in cross-section, the cylindrical surface extends a first distance from the outer rim to the inner end on an inferior side of the acetabular prosthetic component and the cylindrical surface extends a second distance from the outer rim to the inner end on a superior side of the acetabular prosthetic component. The second distance is less than the first distance.

In some embodiments, the outer rim may include an inferior rim section and a superior rim section that extends at a non-orthogonal angle relative to the inferior rim section. In some embodiments, the non-orthogonal angle may be equal to about 15 degrees.

In some embodiments, the inferior rim section may be positioned in an imaginary plane, and the inner end of the cylindrical surface on the superior side of the acetabular prosthetic component may be positioned lateral of the imaginary plane such that a portion of the semi-spherical surface extends through the imaginary plane. The portion of the semi-spherical surface may define a cupped region that resists dislocation of the femoral head component from within the cavity.

In some embodiments, the acetabular prosthetic component may include an outer wall that is positioned opposite the inner wall. The outer wall may include a lateral edge that is positioned lateral of the imaginary plane.

In some embodiments, the acetabular prosthetic component may include a component axis that extends orthogonal to the inferior rim section, and the semi-spherical surface may include a central axis that extends at a non-orthogonal angle relative to the component axis. Additionally, in some embodiments, the non-orthogonal angle may be equal to about 15 degrees.

In some embodiments, the cylindrical surface may include a second central axis that is coincident with the central axis of the semi-spherical surface.

Additionally, in some embodiments, the orthopaedic prosthetic component may also comprises a prosthetic shell including an outer surface shaped to be positioned in a surgically-prepared acetabulum of a patient's pelvis and an inner cavity that receives the acetabular prosthetic component.

In some embodiments, the prosthetic shell may include a second central axis that is coincident with the component axis of the acetabular prosthetic component.

According to another aspect, an orthopaedic prosthesis is disclosed. The orthopaedic prosthesis comprises an acetabular shell component having a distal rim and a concave curved surface extending from the distal rim to define an inner cavity. The distal rim is positioned in an imaginary plane. The orthopaedic prosthesis also comprises an insert component configured to be received in the inner cavity. The insert component includes an outer rim, an inner wall extending inwardly from the outer rim, and a cavity that is defined by the inner wall and is sized to receive a femoral head of a femoral prosthetic component. The inner wall includes a cylindrical surface and a semi-spherical surface, and the semi-spherical surface extends through the imaginary plane to a superior edge that is positioned lateral of the imaginary plane. The superior edge may define a region shaped to resist dislocation and separation of the femoral head of the femoral prosthetic component from the insert component.

In some embodiments, the acetabular shell component may include a shell axis that extends orthogonal to the imaginary plane, and the cylindrical surface may include a first central axis and the semi-spherical surface includes a second central axis that extends coincident with the first central axis. When the orthopaedic prosthesis is viewed in cross-section, a non-orthogonal angle may be defined between the coincident first and second central axis and the shell axis. In some embodiments, the non-orthogonal angle may be equal to about 15 degrees.

In some embodiments, the outer rim of the insert component may include an inferior rim section and a superior rim section that extends at a non-orthogonal angle relative to the inferior rim section. Additionally, in some embodiments, the inferior rim section of the insert component may extend parallel to the distal rim of the acetabular shell component.

In some embodiments, the insert component may include an outer wall that is positioned opposite the inner wall. The outer wall may include a lateral edge that is positioned lateral of the imaginary plane.

In some embodiments, the orthopaedic prosthesis may further comprises the femoral prosthetic component including an elongated stem and the femoral head secured to the elongated stem. Additionally, in some embodiments, the femoral head may include a geometric center that is positioned lateral of the imaginary plane of the shell component.

In some embodiments, when the orthopaedic prosthesis is viewed in cross-section, the cylindrical surface may extend a first distance from the outer rim to the inner end on an inferior side of the insert component and the cylindrical surface may extend a second distance from the outer rim to the inner end on a superior side of the insert component. The second distance may be less than the first distance. The cylindrical surface may define a bore having a superior side that has a depth that is less than a depth of its inferior side.

According to another aspect, an orthopaedic prosthesis comprises a femoral prosthetic component including an elongated stem and a femoral head secured to the elongated stem and an acetabular shell component having a distal rim and a concave curved surface extending from the distal rim to define an inner cavity. The distal rim is positioned in an imaginary plane. The orthopaedic prosthesis also comprises an insert component configured to be received in the inner cavity. The insert component includes an outer rim, an inner wall extending inwardly from the outer rim, and a cavity defined by the inner wall. The cavity is sized to receive the femoral head of the femoral prosthetic component. The inner wall includes a cylindrical surface extending inwardly from the outer rim to an inner end, and a semi-spherical surface connected to the inner end of the cylindrical surface. The semi-spherical surface extends through the imaginary plane to define a region shaped to resist dislocation of the femoral head, and the femoral head includes a geometric center that is positioned lateral of the imaginary plane of the shell component.

According to another aspect, a method is disclosed. The method comprises aligning an insert component with a distal cavity of an acetabular shell component, rotating the insert component to position a first rim section of the insert component superior of a second rim section of the insert component, and securing the insert component to the acetabular shell component. The second rim section of the insert component extends parallel to a distal rim of the acetabular shell component. The insert component includes a semi-spherical inner surface that has a superior sedge that extends through an imaginary plane defined by the distal rim of the acetabular shell component when the insert component is secured to the acetabular shell component.

In some embodiments, the method may further comprise advancing a femoral head component into engagement with the semi-spherical inner surface of the insert component to seat the femoral head component in the insert component. When the femoral head component is seated in the insert component, a geometric center of the femoral head component is positioned lateral of the imaginary plane of the acetabular shell component.

In some embodiments, the step of securing the insert component to the acetabular shell component may comprise advancing a rib formed on one of the insert component and the acetabular shell component into a groove of the other of the insert component and the acetabular shell component.

