A comprehensive investigation was immediately initiated on receipt of the complaint.The product was returned for eval, a review was conducted of all applicable material records, mfg records, storage records, and distribution records according to the descriptions of the product used with the concomitant device.All records revealed all product lots were manufactured within specs, maintained and distributed in accordance with all federal, state an operating procedures.The returned implant was visually inspected, and was still intact, dimensionally accurate and functional.The implant was disassembled to evaluate the internal components, and all components were intact.The drive screw and back ramp components measured within tolerance.All films available do not show any unusual representation of the implant.The exact cause of the reported loss of height cannot be ascertained.
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