This in vitro biomechanical study tests initial glenoid baseplate fixation in two uncemented reverse shoulder prostheses — the Delta III and RSP — asking how glenosphere lateral offset and peripheral screw type interact to drive baseplate micromotion under physiologic compressive and shear loading.
When implanting a reverse shoulder prosthesis with increased lateral offset, use larger-diameter captured peripheral screws — the data show this single technical choice can reduce baseplate micromotion by up to 35% and is what keeps the construct below the threshold needed for bone ingrowth, regardless of offset magnitude.
In patients with poor glenoid bone stock, neither screw type nor offset optimization fully compensates for inadequate purchase, so intraoperative assessment of screw torque and cortical engagement should guide your fixation strategy.
This in vitro biomechanical study tests initial glenoid baseplate fixation in two uncemented reverse shoulder prostheses — the Delta III and RSP — asking how glenosphere lateral offset and peripheral screw type interact to drive baseplate micromotion under physiologic compressive and shear loading.
When implanting a reverse shoulder prosthesis with increased lateral offset, use larger-diameter captured peripheral screws — the data show this single technical choice can reduce baseplate micromotion by up to 35% and is what keeps the construct below the threshold needed for bone ingrowth, regardless of offset magnitude.
In patients with poor glenoid bone stock, neither screw type nor offset optimization fully compensates for inadequate purchase, so intraoperative assessment of screw torque and cortical engagement should guide your fixation strategy.