Arthroplasty IOT Training Practice Test

The idea is about where the two legs of the glenoid component extend beyond the articular surface to get solid bone purchase. When you position the legs on the anterior side, you’re creating overhang toward the front of the shoulder, which helps anchor the baseplate and accommodate the curved rim of the glenoid.

Pairing an anterior leg at the superior position with an anterior leg at the inferior position places overhang across both the top and bottom of the anterior rim. This provides a stable anterior projection that engages bone along the full vertical span, improving fixation while keeping the posterior aspect more contained. The other options either aim legs toward the back or fail to provide overhang across both the superior and inferior extents, which is why they’re not the best choice for achieving the desired anterior overhang.