MAUDE Adverse Event Report: STRYKER GMBH LOCKING SCREW VARIAX2 T10, FULL THREAD, 3.5MM / L16MM; SCREW, FIXATION, BONE

Model Number	657316S
Medical Device Problem Code	Positioning Failure (1158)
Health Effect - Clinical Codes	No Known Impact Or Consequence To Patient (2692); No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	07/09/2020
Type of Reportable Event	Malfunction
Additional Manufacturer Narrative
Upon completion of investigation, additional information will be provided in a supplemental report.
Event or Problem Description
As reported: "when using the variax locking screw, the plate and screw did not lock." additionally reported: "only one hole in the plate could not be locked.The procedure ended without inserting a screw into the hole.".
Additional Manufacturer Narrative
The reported event could be confirmed, since the product was returned for evaluation and matches the alleged failure mode.The device inspection revealed the following: the returned device presents significant damage to the threads under screw-head due to high deformation, which should have led to an inability to screw with the plate.Screw-head interface at which screwdriver comes in contact is heavily damaged, representing the application of excessive mechanical force while tightening.A functional test was performed by screwing the returned screw with a sample variax plate, and the device was turning perpetually without locking into the plate.A review of the device history for the reported lot did not indicate any abnormalities.No corrective actions are required at this time.A review of the labeling did not indicate any abnormalities.Based on investigation, the root cause was attributed to a user related issue.As the visual inspection shows high deformation of thread under screw-head, the failure must have caused due to application of excessive mechanical force or tightening of misaligned devices.If any further information is provided, the complaint report will be updated.
Event or Problem Description
As reported: "when using the variax locking screw, the plate and screw did not lock." additionally reported: "only one hole in the plate could not be locked.The procedure ended without inserting a screw into the hole.".

• Brand Name: LOCKING SCREW VARIAX2 T10, FULL THREAD, 3.5MM / L16MM
• Common Device Name: SCREW, FIXATION, BONE
• Manufacturer (Section D): STRYKER GMBH; bohnackerweg 1; postfach; selzach 2545 ; SZ 2545
• MDR Report Key: 10365322
• Report Number: 0008031020-2020-02070
• Device Sequence Number: 951259
• Product Code: HWC
• UDI-Device Identifier: 07613327086881
• UDI-Public: 07613327086881
• Combination Product (Y/N): N
• PMA/510(K) Number: K132502
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Reporter Type: Manufacturer
• Report Source: health professional
• Initial Reporter Occupation: Physician
• Type of Report: Initial,Followup
• Report Date (Section B): 10/02/2020

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Is this an Adverse Event Report?: No
• Is this a Product Problem Report?: Yes
• Operator of Device: Health Professional
• Device Expiration Date: 02/28/2025
• Device Model Number: 657316S
• Device Catalogue Number: 657316S
• Device Lot Number: G21668
• Was Device Available for Evaluation?: Device Returned to Manufacturer
• Date Returned to Manufacturer: 08/05/2020
• Initial Date Received by Manufacturer: 07/09/2020
• Supplement Date Received by Manufacturer: 09/10/2020
• Initial Report FDA Received Date: 08/04/2020
• Supplement Report FDA Received Date: 10/02/2020
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Patient Sequence Number: 1
• Patient Age: 88 YR