Systems for reverse shoulder implants

A system for modular reverse shoulder prosthesis, the system comprising:

• a humeral component having a proximal cavity, the proximal cavity including a bottom surface and an inner sidewall;
• a plurality of teeth provided on the bottom surface of the proximal cavity;
• an insert having a distal end and a proximal end, the distal end configured to engage the proximal cavity of the humeral component and including a surface opposing the bottom surface of the proximal cavity when the insert is inserted into the proximal cavity;
• and
• fins projecting inwardly from the inner sidewall of the proximal cavity, the fins projecting to an inner diameter that is smaller than an outer diameter of an outer sidewall of the insert, the fins arranged with respect to the proximal cavity of the humeral component such that the fins assist in securing the insert against rotation about an insert axis with respect to the humeral component, wherein
• the distal end of the insert includes the outer sidewall, the outer sidewall is defined about the insert axis, the proximal end includes a concave articular surface,
• the plurality of teeth engage the surface opposing the bottom surface of the proximal cavity and secure the insert against rotation about the insert axis with respect to the humeral component, and
• the fins deform the insert by inelastically deforming the insert when the insert is inserted into the humeral component.

A system for modular reverse shoulder prosthesis, the system comprising:

• a humeral component having a proximal cavity, the proximal cavity including a bottom surface and an inner sidewall;
• a plurality of teeth provided on the bottom surface of the proximal cavity;
• an insert having a distal end and a proximal end, the distal end configured to engage the proximal cavity of the humeral component and including a surface opposing the bottom surface of the proximal cavity when the insert is inserted into the proximal cavity;
• and
• fins projecting inwardly from the inner sidewall of the proximal cavity, the fins projecting to an inner diameter that is smaller than an outer diameter of an outer sidewall of the insert, the fins arranged with respect to the proximal cavity of the humeral component such that the fins assist in securing the insert against rotation about an insert axis with respect to the humeral component, wherein
• the distal end of the insert includes the outer sidewall, the outer sidewall is defined about the insert axis, the proximal end includes a concave articular surface,
• the plurality of teeth engage the surface opposing the bottom surface of the proximal cavity and secure the insert against rotation about the insert axis with respect to the humeral component, and
• the fins deform the insert by cutting the insert when the insert is inserted into the humeral component.