Wear of Total Shoulder Prostheses
Wear performance of shoulder replacements is assessed via loading and displacement parameters associated with activities of daily living, defined in literature and through client-specified protocols. Up to 12 TSR implants can be assessed through the use of OIC’s AMTI hip simulator. Both anatomic and reverse systems can be tested. Samples complete 5 million cycles of testing, and wear is measured through gravimetric analysis. Typical add-ons for this test are accelerated aging of polyethylene components (ASTM F2003), wear particle characterization (ASTM F1877), surface roughness characterization, and CMM measurement to evaluate dimensional changes resulting from the test. Adverse condition testing is also commonly performed to evaluate TSR device performance under non-ideal conditions such as increased force, different motions, and roughened or pre-damaged articular surfaces.