Visual, dimensional, functional and material analysis could not be performed as the device was not returned.Device and complaint history records review could not be performed as a valid lot code was not provided and could not be obtained.The index level of the initial procedure was l4-5, this event was related to the adjacent level above.This event was initially reported as related to the surgery, yet relation to the device was listed as "unknown".Multiple attempts at receiving additional information were made, but nothing was received.Since device failure mode is unknown and device was not returned, an exact cause of the reported event cannot be determined.
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