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The driver was returned for evaluation.Visual inspection confirms that the distal tip has sheared off.The threads are not broken off of the instrument but are damaged.The root cause is likely that the instrument is not completely disengaged/unthreaded from the mating screw upon removal, and excessive force is placed on the male threads.Review of device history records showed no manufacturing or processing related irregularities.Labeling review: warnings: 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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