MAUDE Adverse Event Report: STRYKER ORTHOPAEDICS-MAHWAH TRIATHLON PRIM TIB BASEPLATE - CEMENTED; PROSTHESIS, KNEE, PATELLO/FEMOROTIBIAL, SEMI-CONSTRAINED, UNCEMENTED, POROUS, CO

Model Number	5520-B-300
Medical Device Problem Code	Unstable (1667)
Health Effect - Clinical Codes	Ambulation or Postural Difficulties (2544); Joint Laxity (4526)
Date of Event	03/06/2017
Type of Reportable Event	Serious Injury
Additional Manufacturer Narrative
An event regarding instability involving a triathlon baseplate was reported.The event was not confirmed.Method & results: product evaluation and results: material analysis, visual, functional and dimensional inspections could not be performed as the device was not returned.Clinician review: a review of the provided medical records by a clinical consultant indicated: on (b)(6) 2017 it was noted that a "revision right tka" was performed for a pre- and post­operative diagnosis of "failed right tka".The operative report describes general anesthesia and a 120 minute tourniquet time.The operative report notes, ".Radiographs.Partial posterior subluxation of femur on tibia.With instability." and ".Polyethylene liner.Complete wear over the posterior aspects of both medial and lateral.No examination of explanted components and no immediate post-operative or serial x-rays of either knee until (b)(6) 2016 to determine if the tibial components were initially placed in varus in this obese patient are available for review.After more than seven years in situ, if the tibial components were placed in varus and the mechanical axis of the knee was not restored and ligamentous stability not gained, accelerated polyethene wear would have been inevitable independent of any factors possibly associated with implant manufacturing or materials.Product history review: review of the device history records indicate devices were manufactured and accepted into final stock with no relevant reported discrepancies.Complaint history review: there have been no other similar events for the lot referenced.Conclusions: the exact cause of the event could not be determined because insufficient information was provided.Further information such as return of the device, pathology reports, pre- and post-operative x-rays and the primary operative report as well as patient history and follow-up notes are needed to complete the investigation for determining root cause.No further investigation for this event is possible at this time.If devices and / or additional information become available to indicate further evaluation is warranted, this record will be reopened.
Event or Problem Description
Its reported by the attorney, through the filing of a lawsuit, that the plaintiff underwent a right total knee replacement on (b)(6) 2008 where she was implanted with a stryker knee system.It is further alleged that the plaintiff underwent revision surgery on (b)(6) 2017.The surgeon notes that "examination of the polyethylene liner after removal showed complete wear over the posterior aspects of both medial and lateral aspects of the polyethylene liner." updated as per medical review , on (b)(6) 2017 it was noted that a "revision right tka" was performed for a pre- and post­operative diagnosis of "failed right tka".The operative report describes general anesthesia and a 120 minute tourniquet time.The operative report notes, ".Radiographs.Partial posterior subluxation of femur on tibia.With instability." and ".Polyethylene liner.Complete wear over the posterior aspects of both medial and lateral.

• Brand Name: TRIATHLON PRIM TIB BASEPLATE - CEMENTED
• Common Device Name: PROSTHESIS, KNEE, PATELLO/FEMOROTIBIAL, SEMI-CONSTRAINED, UNCEMENTED, POROUS, CO
• Manufacturer (Section D): STRYKER ORTHOPAEDICS-MAHWAH; 325 corporate drive; mahwah NJ 07430
• MDR Report Key: 12164846
• Report Number: 0002249697-2021-01199
• Device Sequence Number: 11705926
• Product Code: MBH
• UDI-Device Identifier: 07613327050318
• UDI-Public: 07613327050318
• Combination Product (Y/N): N
• Initial Reporter State: NJ
• Initial Reporter Country: US
• PMA/510(K) Number: K141056
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2008
• Device Explanted Year: 2017
• Reporter Type: Manufacturer
• Report Source: consumer,other
• Initial Reporter Occupation: Other
• Type of Report: Initial
• Report Date (Section B): 07/14/2021

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: 09/03/2013
• Device Model Number: 5520-B-300
• Device Catalogue Number: 5520-B-300
• Device Lot Number: YSWE
• Was Device Available for Evaluation?: No
• Type of Report(Section G): Initial
• Initial Date Received by Manufacturer: 06/22/2021
• Initial Report FDA Received Date: 07/14/2021
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Patient Sequence Number: 1
• Outcome Attributed to Adverse Event: Hospitalization; Required Intervention
• Patient Age: 54 YR