An implant includes a base, a flange, and ridge. The flange extends from the base. The ridge extends from the flange. A hole extends through the flange and the ridge. A system with the implant includes a fastener extending through the ridge of the implant. The implant is placed into bone by securing a base of the implant to a main complementary contact surface of bone and by securing a ridge extending outwardly from a flange of the implant to a secondary complementary contact surface of bone spaced from the main complementary contact surface.

A joint replacement device is provided that includes an inner surface configured to accommodate at least one of a portion of an outer surface of a femoral head of a femur and a prosthetic secured to the femoral head, an outer surface configured to accommodate at least one of a portion of an outer surface of an acetabulum socket and a prosthetic secured to a pelvis, wherein the inner surface and outer surface each have a circular curvilinear shape and together include an inner perimeter and an outer perimeter, and wherein the inner perimeter is joined to the outer perimeter to form a posterior limb and an anterior limb, and further including, a posterior portion, an anterior portion, and a superior portion formed from the inner surface and the outer surface; wherein the superior portion further includes a posterior superior portion and an anterior superior portion.

A medical device for implantation in a hip joint of a patient. The medical device comprises an inner and an outer surface, wherein a contacting portion of said inner surface is spherical and adapted to face a center of the hip joint when said medical device is implanted. The medical device is adapted to receive a caput femur or a prosthetic caput femur having a spherical portion. Said medical device comprises at least one extending portion adapted to clasp the caput femur, or prosthetic caput femur, for restraining said caput femur, or said prosthetic caput femur in said medical device. The extending portion comprises an elastic portion, and the medical device is adapted to release the caput femur or prosthetic caput femur from said medical device by deflecting said at least extending portion when a predetermined strain is placed on said medical device by abnormal movement of the hip joint caused by the patient.

A joint replacement device is provided that includes an inner surface configured to accommodate at least one of a portion of an outer surface of a femoral head of a femur and a prosthetic secured to the femoral head, an outer surface configured to accommodate at least one of a portion of an outer surface of an acetabulum socket and a prosthetic secured to a pelvis, wherein the inner surface and outer surface each have a circular curvilinear shape and together include an inner perimeter and an outer perimeter, and wherein the inner perimeter is joined to the outer perimeter to form a posterior limb and an anterior limb, and further including, a posterior portion, an anterior portion, and a superior portion formed from the inner surface and the outer surface; wherein the superior portion further includes a posterior superior portion and an anterior superior portion.

A medical device for implantation in a hip joint of a patient is provided. The medical device is adapted to be fixated to the pelvic bone of the patient. The medical device comprises an inner and an outer surface, a contacting portion of the inner surface is spherical and adapted to face the center of the hip joint when said medical device is implanted, and said medical device is adapted to receive a caput femur or a prosthetic caput femur having a spherical portion. The medical device comprises at least one extending portion adapted to clasp the caput femur, or prosthetic caput femur, for restraining said caput femur, or prosthetic caput femur in said medical device. The medical device is adapted to release the caput femur or prosthetic caput femur from the medical device when a predetermined strain is placed on the medical device.

An implant includes a base, a flange, and ridge. The flange extends from the base. The ridge extends from the flange. A hole extends through the flange and the ridge. A system with the implant includes a fastener extending through the ridge of the implant. The implant is placed into bone by securing a base of the implant to a main complementary contact surface of bone and by securing a ridge extending outwardly from a flange of the implant to a secondary complementary contact surface of bone spaced from the main complementary contact surface.

A medical device for implantation in a hip joint of a patient is provided. The medical device is adapted to be fixated to the pelvic bone of the patient. The medical device comprises an inner and an outer surface, wherein a contacting portion, of said inner surface is spherical and adapted to face the center of the hip joint when said medical device is implanted. The medical device is adapted to receive a caput femur or a prosthetic replacement therefor having a spherical portion, wherein said medical device comprises at least one extending portion, extending said contacting portion of said inner surface such that said at least one extending portion clasps said spherical portion of said caput femur, or a prosthetic replacement therefor, such that said spherical portion is restrained in said medical device. Restraining the caput femur in the medical device reduces the risk that the hip joint dislocates when in use by the patient.

A bionic acetabular prosthesis has a spherically cap-shaped cup body. The body is inwardly concave at the bottom to form a hollow cavity, and has on its outer wall surface, annular collars, each having a trapezoidal cross-section with a larger base portion and a smaller top portion. The collars are provided with circumferentially-spaced notches, having a recessed depth smaller than or equal to a raised height of the collars. Slopes of opposite side faces of the cross-sectionally trapezoidal collars on the cup body avoid the formation of defects in the surface of the hollow cavity, ensuring good quality of the resulting acetabular prosthesis. In addition, notches may be arbitrarily formed in the collars. These notches interact with bone cement to restrict circumferential rotation of the cup body. Gently sloped surfaces of adjacent collars join and define annular grooves, which contain more bone cement, stabilizing the cup body.