Platform RTSA glenoid prosthesis with modular attachments capable of improving initial fixation, fracture reconstructions, and joint biomechanics

Inventors

Roche, Christopher P. • Hamilton, Matt • Diep, Phong • Vanasse, Tom • Gaydos, Corey

Assignees

Advita Ortho LLC

Abstract

In some embodiments, the present invention provides a reverse shoulder glenoid prosthesis which supports the attachment of multiple different types of modular attachments that can: 1) provide additional scapular fixation (ie external to the glenoid) in order to improve glenoid implant fixation in cases of severe bone loss/fracture, 2) provide joint line lateralization to improve tissue stability in cases of severe glenoid/scapula bone loss, 3) facilitate use and containment of glenoid bone graft in cases of severe glenoid/scapula bone loss—particularly in those cases in which the glenoid defect is uncontained/peripheral 4) achieve glenoid fixation while at the same time reconstructing the scapular bone in cases of scapula fractures, glenoid fractures, and/or acromial fractures, and 5) provide improved rTSA joint biomechanics, particularly posterior rotator cuff efficiency by changing the line of action of the infraspinatus and teres minor muscles to improve their muscle tension, and also increase each muscle's external rotation and abduction moment arm lengths.

Core Innovation

The invention relates to an rTSA platform glenoid prosthesis kit that supports a glenoid plate operatively connected to a hollowed out portion of a glenosphere, and includes a plurality of accessory fixation points arranged around a stem portion. The glenosphere includes a plurality of slots configured to allow accessories fixed to the accessory fixation points to extend through the slots to a location outside a perimeter of the glenosphere.

The glenoid plate includes a body portion with a first side and a second side and a stem portion extending from the second side and configured to be fixed to a glenoid of a patient. The accessory fixation points extend through the body portion of the glenoid plate and are arranged around the stem portion, enabling accessories to pass across the glenoid plate and exit beyond the glenosphere perimeter for attachment to bone at locations outside the glenosphere perimeter.

In related configurations, at least one accessory is configured to be attached to the second side of the body portion to increase a contact area between the prosthesis and bone of a scapula. In further configurations, accessories are configured to contain or enable glenoid bone grafting for uncontained or peripheral glenoid defects, reconstruct scapular or acromial fracture regions with fracture plates, and enable a muscle augment that translates or relocates the infraspinatus and teres minor line of action to increase external rotation and abduction moment arms.

Claims Coverage

The independent claims cover a kit and a prosthesis architecture in which a glenoid plate and glenosphere include slot-based passage of modular accessories through the glenosphere perimeter, with accessories attachable to fixation points that extend through the glenoid plate body portion.

Across the independent claims, the core coverage is directed to a glenoid plate–glenosphere construct where accessories can be guided through slots to locations outside the glenosphere perimeter, with accessories attachable to fixation points arranged around a stem portion and extending through the glenoid plate body portion, and with an option for an accessory that increases contact area with scapula bone.

Stated Advantages

Documented Applications