Shoulder joint implant selection system

Inventors

ROCHE, Chris • Greene, Alexander • Trousdale, Jonathan • DeCerce, Joseph

Assignees

Exactech Inc • Howmedica Osteonics Corp

Abstract

A selection system comprises a ring, a plurality of shims, a measurement device, and at least one glenoid component. The ring is configured to couple to a humerus. A shim of the plurality of shims is configured to couple to the ring. The measurement device is configured to couple to the shim. Each shim of the plurality of shims has a different height when coupled to the ring. The selection system generates measurement data to support the selection of at least one prosthetic component for a shoulder joint in a surgical environment. The shoulder joint geometry can be adjusted by changing shims, changing glenoid component or both. The selection system is removed after the selection of the final prosthetic components for the shoulder joint. The final prosthetic components are installed in the shoulder joint. The measurement device is placed in the shoulder joint and measurement data is generated to verify performance.

Core Innovation

The invention provides a selection system configured to support selection of prosthetic components during shoulder surgery and shoulder arthroplasty. The system includes a ring configured to be coupled directly to a first bone of a shoulder joint and at least one fastener, including at least one of a nail or a screw, configured to couple the ring to the first bone. A measurement device having a plurality of sensors is positioned at radial locations relative to an external curved surface and is configured to couple directly to the ring.

The measurement device comprises an external surface configured to articulate with a shoulder prosthetic component coupled to a second bone. The system generates measurement data configured to support selection of a shoulder prosthetic component coupled to the second bone, a further shoulder prosthetic component configured to be coupled to the first bone, or both. In a trialing configuration, changing a plurality of shims changes the device height and geometry to adjust applied loading and joint kinetics.

The measurement data is generated in real time and includes load magnitude, contact point, range of motion, stability, and impingement. The system supports force and position calculations, impingement detection logic, and a GUI display for communicating the measurement data to a surgeon or surgical team to support decision-making prior to final prosthetic installation. Optional integration with wireless communication and robotic assistance is also described.

Claims Coverage

The independent claim coverage includes two independent selection system claims with a common core architecture: a ring coupled to a first shoulder bone, a measurement device with a plurality of sensors at radial positions relative to an external curved surface, and real-time generation of measurement data used to support intraoperative prosthetic selection. The claims also include computer/display processing, predetermined threshold selection, a retaining feature, and support for selecting prosthetic components for one or both bones.

Across the independent claims, the core coverage is a shoulder surgery prosthetic selection system that couples a ring to a first bone and couples a sensor-based measurement device to the ring so that the measurement device articulates with a prosthetic component on a second bone. The system generates measurement data used to support selection, with real-time computer processing and display and a predetermined-threshold rule for selecting between first and second prosthetic components, and with a retaining feature in the ring.

Stated Advantages

Documented Applications