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-600
Medical Device Problem Code	Unstable (1667)
Health Effect - Clinical Codes	Pain (1994); Injury (2348); Ambulation or Postural Difficulties (2544); Joint Laxity (4526)
Date of Event	01/04/2017
Type of Reportable Event	Serious Injury
Additional Manufacturer Narrative
Review of the device history records indicate that devices were manufactured and accepted into final stock with no reported discrepancies.There has been another event for the lot referenced.The information in this report was provided by stryker orthopaedics legal affairs department.No additional information is available at this time due to the ongoing litigation.Should additional information become available, the evaluation summary will be submitted in a supplemental report.Reported event: an event regarding instability involving a triathlon baseplate was reported.The event was confirmed through clinician review of the provided medical records.Method & results: product evaluation and results: not performed as no product was returned for evaluation.Clinician review: a review of the provided medical records and x-rays by a clinical consultant indicated: more than minimal and unequal bone restrictions on distal femur and proximal tibia have resulted in an increase in amount of bone resection across the knee that cannot be compensated anatomically by the use of the thinnest available bearing of 9- mm thickness.Initial subclinical instability has increased with time under daily load further and magnified by patient's obesity resulting in clinical instability ultimately requiring revision surgery with increase in constraint across the knee through use of triathlon ts devices.Does the review identify any procedural related factors that contributed to the event? more than minimal and unequal bone resection on distal femur and proximal tibia.Use of a thinner bearing than corresponds with the amount of bone resection.Product history review: indicated all devices were manufactured and accepted into final stock with no reported discrepancies.Complaint history review: there have been no other similar events for the lot referenced.Conclusions: the event of instability was confirmed by clinician review who indicated: more than minimal and unequal bone restrictions on distal femur and proximal tibia have resulted in an increase in amount of bone resection across the knee that cannot be compensated anatomically by the use of the thinnest available bearing of 9- mm thickness.Initial subclinical instability has increased with time under daily load further and magnified by patient's obesity resulting in clinical instability ultimately requiring revision surgery with increase in constraint across the knee through use of triathlon ts devices.Does the review identify any procedural related factors that contributed to the event? more than minimal and unequal bone resection on distal femur and proximal tibia.Use of a thinner bearing than corresponds with the amount of bone resection.No further investigation is required at this time.If additional information becomes available to indicate further evaluation is warranted, this record will be reopened.
Event or Problem Description
It was reported through the communication of an attorney that allegedly the patient was revised due to "failed right total knee arthroplasty".Update: based on the medical review dated 24 march 2020 [.] initial subclinical instability has increased with time under daily load further and magnified by patient's obesity resulting in clinical instability ultimately requiring revision surgery with increase in constraint across the knee through use of triathlon ts devices.
Event or Problem Description
No new information.
Additional Manufacturer Narrative
Reported event: an event regarding instability involving a triathlon baseplate was reported.The event was confirmed through clinician review of the provided medical records.Method & results: -product evaluation and results: not performed as no product was returned for evaluation.-clinician review: a review of the provided medical records and x-rays by a clinical consultant indicated: more than minimal and unequal bone restrictions on distal femur and proximal tibia have resulted in an increase in amount of bone resection across the knee that cannot be compensated anatomically by the use of the thinnest available bearing of 9- mm thickness.Initial subclinical instability has increased with time under daily load further and magnified by patient's obesity resulting in clinical instability ultimately requiring revision surgery with increase in constraint across the knee through use of triathlon ts devices.More than minimal and unequal bone resection on distal femur and proximal tibia.Use of a thinner bearing than corresponds with the amount of bone resection.An updated med review indicated: "confirmation of event: i can only confirm the primary and revision knee arthroplasties through the medical record which provided reports of x-rays of the primary and revision knee arthroplasty.I cannot confirm the dates.Root cause analysis: the root cause of this event cannot be determined with certainty.The causes of late instability in a total knee arthroplasty are multifactorial including surgical technique, patient lifestyle and activity level as well as bmi.Stretching of the ligament complexes after surgery is not uncommon" -product history review: indicated all devices were manufactured and accepted into final stock with no reported discrepancies.-complaint history review: there have been no other similar events for the lot referenced.Conclusions: the event of instability was confirmed by clinician review who indicated: more than minimal and unequal bone restrictions on distal femur and proximal tibia have resulted in an increase in amount of bone resection across the knee that cannot be compensated anatomically by the use of the thinnest available bearing of 9- mm thickness.Initial subclinical instability has increased with time under daily load further and magnified by patient's obesity resulting in clinical instability ultimately requiring revision surgery with increase in constraint across the knee through use of triathlon ts devices.More than minimal and unequal bone resection on distal femur and proximal tibia.Use of a thinner bearing than corresponds with the amount of bone resection.An updated med review indicated: "confirmation of event: i can only confirm the primary and revision knee arthroplasties through the medical record which provided reports of x-rays of the primary and revision knee arthroplasty.I cannot confirm the dates.Root cause analysis: the root cause of this event cannot be determined with certainty.The causes of late instability in a total knee arthroplasty are multifactorial including surgical technique, patient lifestyle and activity level as well as bmi.Stretching of the ligament complexes after surgery is not uncommon" no further investigation is required at this time.If additional information becomes available to indicate further evaluation is warranted, this record will be reopened.

• 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
• Manufacturer (Section G): STRYKER ORTHOPAEDICS-MAHWAH; 325 corporate drive; mahwah NJ 07430
• Manufacturer Contact: arokiya raj ; 325 corporate drive; mahwah, NJ 07430 ; 2018315000
• MDR Report Key: 9996404
• Report Number: 0002249697-2020-00798
• Device Sequence Number: 4597601
• Product Code: MBH
• UDI-Device Identifier: 07613327050349
• UDI-Public: 07613327050349
• 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: 2013
• Device Explanted Year: 2017
• Reporter Type: Manufacturer
• Report Source: Other,Consumer
• Initial Reporter Occupation: Other
• Type of Report: Initial,Followup
• Report Date (Section B): 05/28/2025

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: 06/30/2017
• Device Model Number: 5520-B-600
• Device Catalogue Number: 5520-B-600
• Device Lot Number: HJZLD
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: No
• Type of Report(Section G): Initial
• Initial Date Received by Manufacturer: 03/27/2020
• Supplement Date Received by Manufacturer: 04/30/2025
• Initial Report FDA Received Date: 04/24/2020
• Supplement Report FDA Received Date: 05/28/2025
• Was Device Evaluated by Manufacturer? (Y/N): Device Not Returned to Manufacturer
• Date Device Manufactured: 06/22/2012
• 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: Hospitalization; Required Intervention
• Patient Age: 56 YR
• Patient Sex: Male