Modular shoulder prosthesis system

A shoulder prosthesis system for implantation in a patient, said system having a stem with one end for inserting in the patient's humerus and having an angled face at its opposite end, a head for positioning in the patient's glenoid cavity having a generally spherical surface on one side and a generally flat face on the opposite side, a conical cavity in said stem face, a conical cavity in said flat head face, and a unitary member for connecting said head and stem having two projections extending in generally opposite directions, one projection being shaped for insertion in said stem cavity, the other for insertion in said head cavity, and said projections having axes which are either collinear, or parallel but radially offset from each other, or inclined at an obtuse angle to each other, the cavity in the stem having an additional cavity forming a keyway and the projection shaped for insertion in the stem having a key shaped to mate with said keyway, said stem and head being each selected from a plurality of stems and heads, each having the respective cavities in the same location in the head face and in the stem face, and the keyway in all said stems being in the same location relative to the stem cavity.

A shoulder prosthesis system for implantation in a patient, said system having a stem with one end for inserting in the patient's humerus and having an angled face at its opposite end, a head for positioning in the patient's glenoid cavity having a generally spherical surface on one side and a generally flat face on the opposite side, a conical cavity in said stem face, a conical cavity in said flat head face, and a unitary member for connecting said head and stem having two projections extending in generally opposite directions, one projection being shaped for insertion in said stem cavity, the other for insertion in said head cavity, and said projections having axes which are either collinear, or parallel but radially offset from each other, or inclined at an obtuse angle to each other, and the radial offsets of different connecting members differing by 2 mm from each other.

A shoulder prosthesis system for implantation in a patient, said system having a stem with one end for inserting in the patient's humerus and having an angled face at its opposite end, a head for positioning in the patient's glenoid cavity having a generally spherical surface on one side and a generally flat face on the opposite side, a conical cavity in said stem face, a conical cavity in said flat head face, and a unitary member for connecting said head and stem having two projections extending in generally opposite directions, one projection being shaped for insertion in said stem cavity, the other for insertion in said head cavity, and said projections having axes which are either collinear, or parallel but radially offset from each other, or inclined at an obtuse angle to each other, the face of at least one of the head and stem is sufficiently curved to prevent said faces from touching when inclined relative to each other by a connecting member having projections at a given obtuse angle.

A shoulder prosthesis system for implantation in a patient, said system having a stem with one end for inserting in the patient's humerus and having an angled face at its opposite end, a head for positioning in the patient's glenoid cavity having a generally spherical surface on one side and a generally flat face on the opposite side, a conical cavity in said stem face, a conical cavity in said flat head face, and a unitary member for connecting said head and stem having two projections extending in generally opposite directions, one projection being shaped for insertion in said stem cavity, and the other for insertion in said head cavity, and said projections having axes which are radially offset from each other.