MAUDE Adverse Event Report: STRYKER GMBH LOCKING SCREW,T8 FULL THREAD, 2.7MM/L18MM; SCREW, FIXATION, BONE

Catalog Number	656318
Medical Device Problem Code	Positioning Failure (1158)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	08/27/2025
Type of Reportable Event	Malfunction
Additional Manufacturer Narrative
Once the investigation is completed, any additional information will be reported in a supplemental report.
Event or Problem Description
As reported: "it was reported that the locking screw would not lock firmly into the locking hole, and the screw would just spin both clockwise and counterclockwise.The surgeon couldn't remove the screw and with only one other good screw in the proximal shaft of the plate above his osteotomy, the surgeon had to redo the construct with a longer plate.Upon putting on the new plate (same version of plate but longer), the surgeon had the same scenario.Upon putting on the plate using the identical drill holes in the distal end of plate had his 3rd screw in the radial styloid hole spin in both directions.The locking screw spun again and couldn't be reversed out of the plate.At this point, the surgeon was reportedly frustrated and had to remove the plate and screws and decided to change constructs using another vendor's plate.The procedure was completed successfully using a different device.".
Event or Problem Description
As reported: "it was reported that the locking screw would not lock firmly into the locking hole, and the screw would just spin both clockwise and counterclockwise.The surgeon couldn't remove the screw and with only one other good screw in the proximal shaft of the plate above his osteotomy, the surgeon had to redo the construct with a longer plate.Upon putting on the new plate (same version of plate but longer), the surgeon had the same scenario.Upon putting on the plate using the identical drill holes in the distal end of plate had his 3rd screw in the radial styloid hole spin in both directions.The locking screw spun again and couldn't be reversed out of the plate.At this point, the surgeon was reportedly frustrated and had to remove the plate and screws and decided to change constructs using another vendor's plate.The procedure was completed successfully using a different device.".
Additional Manufacturer Narrative
The reported event could be confirmed based on the device inspection.The device inspection revealed the following: two plates were received along with two screws.One screw each was stuck in one of the holes of the plate.A few locking holes and external surface of the plates found worn out most probably due to usage and tightening of the screw.Heads of both the screw is stuck in the rim of holes of the plate and rotating both in clockwise and counterclockwise direction.There is no purchase for the screw to climb up and come out of plate.As far as screws are concerned, there is no damage on screws, they look in extremely good condition.During functional inspection, both the screws are rotating both in clockwise and counterclockwise direction with slight resistance in the anticlockwise direction.Outer diameter of the screw found within specification.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.No indications of material, manufacturing or design related problems were found during the investigation.Based on the investigation and mechanical behavior of the screws , it can be said that the screw lost the purchase inside the bone during insertion due to which the rotation is not able to convert into upward or downward motion and the screw is spinning both clockwise and anticlockwise.Since the screw is no longer supported by the bone , it tilts inside the plate hole, the head threads caught the inner rim which is supporting the rotation motion of the screw in both direction.However, the reason for the screw not getting the purchase in the bone is unknown, it could be due to due to poor quality of the bone, oversized drilled hole or stripping of the threads formed inside bone during screw insertion.If more information is provided, the case will be reassessed.

• Brand Name: LOCKING SCREW,T8 FULL THREAD, 2.7MM/L18MM
• Common Device Name: SCREW, FIXATION, BONE
• Manufacturer (Section D): STRYKER GMBH; bohnackerweg 1; postfach; selzach 2545 ; SZ 2545
• Manufacturer (Section G): STRYKER GMBH; bohnackerweg 1; postfach; selzach 2545 ; SZ 2545
• Manufacturer Contact: dannielle stap ; 325 corporate drive; mahwah, NJ 07430 ; 2018315000
• MDR Report Key: 23144777
• Report Number: 0008031020-2025-01642
• Device Sequence Number: 8888965
• Product Code: HWC
• UDI-Device Identifier: 07613327068696
• UDI-Public: (01)07613327068696(11)250409(10)1000558023
• Combination Product (Y/N): N
• Initial Reporter Country: CA
• 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): 12/29/2025

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: 656318
• Device Lot Number: 1000558023
• Was Device Available for Evaluation?: Device Returned to Manufacturer
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Follow-Up
• Initial Date Received by Manufacturer: 08/28/2025
• Supplement Date Received by Manufacturer: 12/01/2025
• Initial Report FDA Received Date: 09/25/2025
• Supplement Report FDA Received Date: 12/29/2025
• Was Device Evaluated by Manufacturer? (Y/N): Yes
• Date Device Manufactured: 04/09/2025
• 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 Sex: Unknown