MAUDE Adverse Event Report: STRYKER GMBH LOCKING SCREW,T8 FULL THREAD, 2.7MM/L12MM; SCREW, FIXATION, BONE

Catalog Number	656312S
Medical Device Problem Code	Positioning Failure (1158)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	10/20/2025
Type of Reportable Event	Malfunction
Additional Manufacturer Narrative
Additional information has been requested and if received, will be provided in the supplemental report.
Event or Problem Description
It was reported that a locking failure occurred.The 1st and 2nd locking screws were used; however, they did not lock into the plate.Cortical screws were used at the holes.Although a malfunction of the plate locking mechanism was considered, the plate was not replaced because three screws had already been inserted.
Additional Manufacturer Narrative
The reported event could not be confirmed since the affected device was not returned and no other evidence was shared for evaluation.A device inspection was not possible since the affected device was not returned.A review of the device history for the reported lot did not indicate any abnormalities.No corrective actions are required at this time.No indications of material, manufacturing or design related problems were found during the investigation.A review of labelling did not indicate any abnormalities.More information as well as the affected device must be available in order to determine the exact root cause of the issue.Related to post market surveillance activities, a potential non-conformity report was initiated to address similar events related to the variax 2 t8 and t10 locking feature.The investigation of the nc revealed that the application of over torque during insertion was the root cause of the event.This leads to damage of the smart lock technology below the head.As a reminder, the operative technique clearly states that the proper use of the screw should prevent this malfunction from happening: when final tightening of the locking screw occurs, take care not to over-torque the screw.Excessive torque may damage the locking mechanism, the screw and/or the screwdriver blade.Although no product related issue could be detected, corrective action was initiated.As a result, the design of the variax 2 locking screws shall be changed to increase the torque to failure of the locking interface.The design change is in progress.If the device is returned or if any additional information is provided, the investigation will be reassessed.
Event or Problem Description
It was reported that a locking failure occurred.The 1st and 2nd locking screws were used, however they did not lock into the plate.Cortical screw were used at the holes.Although a malfunction of the plate locking mechanism was considered, the plate was not replaced because three screws had already been inserted.

• Brand Name: LOCKING SCREW,T8 FULL THREAD, 2.7MM/L12MM
• Common Device Name: SCREW, FIXATION, BONE
• Manufacturer (Section D): STRYKER GMBH; bohnackerweg 1; postfach; selzach 2545 ; SZ 2545
• Manufacturer (Section G): STRYKER LEIBINGER FREIBURG; boetzingerstr. 41; freiburg D-791 11; GM D-79111
• Manufacturer Contact: dannielle stap ; 325 corporate drive; mahwah, NJ 07430 ; 2018315000
• MDR Report Key: 23575609
• Report Number: 0008031020-2025-02075
• Device Sequence Number: 21138002
• Product Code: HWC
• UDI-Device Identifier: 07613327070675
• UDI-Public: (01)07613327070675(17)290806(10)1000568526
• Combination Product (Y/N): N
• Initial Reporter Country: JA
• PMA/510(K) Number: K180500
• 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): 01/08/2026

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 Catalogue Number: 656312S
• Device Lot Number: 1000568526
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Follow-Up
• Initial Date Received by Manufacturer: 10/20/2025
• Supplement Date Received by Manufacturer: 12/11/2025
• Initial Report FDA Received Date: 11/17/2025
• Supplement Report FDA Received Date: 01/08/2026
• Was Device Evaluated by Manufacturer? (Y/N): No
• Date Device Manufactured: 08/07/2024
• Is the Device Labeled for Single Use? (Y/N): Yes
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Usage of Device: Initial
• Patient Sequence Number: 1
• Patient Age: 48 YR
• Patient Sex: Female
• Patient Ethnicity: Non Hispanic
• Patient Race: Asian