ASTM F2028: Standard Test Methods for Dynamic Evaluation of Glenoid Loosening or Disassociation.
This test method measures how much a prosthetic anatomic glenoid component rocks or pivots following cyclic displacement of the humeral head to opposing glenoid rims (for example, superior-inferior or anterior-posterior). Motion is quantified by the tensile displacement opposite each loaded rim after dynamic rocking.
Similarly, this test method measures how much a prosthetic reverse glenoid component rocks or pivots following cyclic articulation with a mating humeral liner. Motion is quantified by the magnitude of displacement before and after cyclic loading.
For the reverse shoulder system, for example, the glenoid component is “implanted” into a bone substrate material and the fixation is measured under axial compressive and a shear loading condition. The induced micromotions at the glenoid baseplate and glenosphere assembly is measured in shear and axial compressive load direction. Displacement measurements are performed using latest generation, high-accuracy digital contact sensors.