MAUDE Adverse Event Report: Stryker Orthopaedics-Mahwah X3 TRIATHLON CS INSERT 5 11MM; Prosthesis, knee, patello/femorotibial, semi-constrained, uncemented, porous, co

Catalog Number	5531-G-511-E
Medical Device Problem Code	Unstable (1667)
Health Effect - Clinical Code	Joint Laxity (4526)
Date of Event	08/03/2026
Type of Reportable Event	Serious Injury
Event or Problem Description
It was reported that the patient's right knee was revised due to joint laxity.A 5x11 cs insert was exchanged for a 5x16 cs insert.Nothing was noted (i.E.Damage/ wear) for the explanted insert.Rep confirmed that no further information will be released by the hospital or surgeon.
Additional Manufacturer Narrative
Review of the device history records indicate devices were manufactured and accepted into final stock with no relevant reported discrepancies.There have been no other similar events for the lot referenced.It was noted that the device is not available for evaluation.Should additional information become available, it will be provided in a supplemental report upon completion of the investigation.

• Brand Name: X3 TRIATHLON CS INSERT 5 11MM
• Common Device Name: Prosthesis, knee, patello/femorotibial, semi-constrained, uncemented, porous, co
• Manufacturer (Section D): Stryker Orthopaedics-Mahwah; 325 corporate drive; mahwah NJ 07430
• Manufacturer (Section G): Stryker Orthopaedics-Mahwah; 325 corporate drive; mahwah NJ 07430
• Manufacturer Contact: juana hiciano ; 325 corporate drive; mahwah, NJ 07430 ; +1(201)831-5000
• MDR Report Key: 50465563
• Report Number: 0002249697-2026-00779
• Device Sequence Number: 15991703
• Product Code: MBH
• UDI-Device Identifier: 07613327336450
• UDI-Public: 07613327336450
• Combination Product (Y/N): N
• Initial Reporter State: RI
• Initial Reporter Country: US
• PMA/510(K) Number: K172634
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2021
• Device Explanted Year: 2026
• Reporter Type: Manufacturer
• Report Source: Health Professional
• Initial Reporter Occupation: Physician
• Type of Report: Initial
• Report Date (Section B): 08/26/2026

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Is this an Adverse Event Report?: Yes
• Is this a Product Problem Report?: No
• Operator of Device: Health Professional
• Device Expiration Date: 03/31/2026
• Device Catalogue Number: 5531-G-511-E
• Device Lot Number: RM0T56
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: Yes
• Initial Date Received by Manufacturer: 08/03/2026
• Initial Report FDA Received Date: 08/27/2026
• Was Device Evaluated by Manufacturer? (Y/N): No
• Date Device Manufactured: 03/24/2021
• 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
• Outcome Attributed to Adverse Event: Required Intervention; Hospitalization
• Patient Sex: Female