(b)(4).Returned for review is a lateral alignment frame.As returned, the thumb screw is fractured where the shaft meets the knob.The o-ring is not returned.The diameter of the shaft is conforming to print specifications, and the material hardness is within print specifications.This device was used for treatment.The device was manufactured in october of 2013 and has a potential field age of 16 months.No additional complaints have been received against this manufacturing lot.The thumb screw is intended to be used as a secondary locking mechanism after the dovetail feature.A definitive cause cannot be determined.This mdr was identified during an internal retrospective review to meet reporting requirements and therefore is being filed retrospectively.
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