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Visual inspection confirms the event.The distal hexalobe tip has sheared off of the driver.The root cause is likely excessive force applied during insertion of the screw along with being not locked properly.If radial bending forces are also applied during screw insertion, the likelihood of shear increases.Review of device history records showed no manufacturing or processing related irregularities.Labeling review: warnings/cautions/precautions:
risks identified with the use of these devices, which may require additional surgery, include device component failure, loss of fixation/stabilization, non-union, vertebral fracture, neurological injury, vascular or visceral injury.Possible adverse effects: initial or delayed loosening, disassembly, bending, dislocation, and/or breakage of device components.
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