Modular reverse shoulder prostheses

摘要

A modular reverse shoulder prosthesis according to embodiments of the present invention includes a stem having a proximal taper and a primary stem axis, the proximal taper extending from the stem about a metaphyseal axis, the metaphyseal axis at an angle with respect to the primary stem axis, a metaphysis having a proximal end, a distal end, a first aperture in the distal end configured to be placed over the proximal taper, and a second aperture in the proximal end having an insert axis that is eccentrically offset from the metaphyseal axis, the metaphysis configured for attachment to the stem at any rotational position of the metaphysis about the metaphyseal axis, and a reverse insert, the reverse insert having a proximal end and a distal end, wherein the proximal end comprises a concave cup formed about a cup axis and configured to receive a glenosphere.

主权项

1. A modular reverse shoulder prosthesis, comprising:
a stem having a proximal taper and a primary stem axis, the proximal taper extending about a metaphyseal axis, the metaphyseal axis at an angle with respect to the primary stem axis; a metaphysis having a proximal end, a distal end, an aperture in the distal end configured to be placed over the proximal taper, and a first interlocking portion at the proximal end having an insert axis that is eccentrically offset from the metaphyseal axis, the metaphysis being configured to rotate around the metaphyseal axis when coupled to the stem, the metaphysis configured for attachment to the stem at a plurality of rotational positions of the metaphysis about the metaphyseal axis, the metaphysis being configured such that an interface between the metaphysis and the stem is positioned below a resection surface of a bone when the prosthesis is implanted; and a reverse insert having a proximal end and a distal end, wherein the proximal end of the reverse insert comprises a concave cup formed about a cup axis and configured to receive a glenosphere, and wherein the distal end of the reverse insert comprises a second interlocking portion, wherein an interface surface between the first and second interlocking portions has a rotational symmetry about the insert axis.