MAUDE Adverse Event Report: STRYKER ORTHOPAEDICS-MAHWAH TRIATHLON SYMMETRIC X3 PATELLA; PROSTHESIS, KNEE, PATELLO/FEMOROTIBIAL, SEMI-CONSTRAINED, UNCEMENTED, POROUS, CO

Model Number	5550-G-339
Medical Device Problem Code	Naturally Worn (2988)
Health Effect - Clinical Codes	Pain (1994); Osteolysis (2377); Swelling/ Edema (4577)
Date of Event	01/18/2011
Type of Reportable Event	Serious Injury
Additional Manufacturer Narrative
An event regarding wear and osteolysis involving a triathlon patella was reported.The event was confirmed via clinician review.Method & results: device evaluation and results: could not be performed as the subject device was not returned.Medical records received and evaluation: a review of the provided medical records by a clinical consultant indicated: patient underwent primary right total knee arthroplasty in 2009 that failed in 2011, with lysis of adhesions and poly exchange.That revision surgery failed again due to loosening and the patient had another revision in 2013.That surgery also failed due to loosening.I can confirm that the events occurred since i was able to review the operation reports, office notes and i reviewed pre op and post op x-rays.Regarding the possible root cause of this event, i cannot determine this for certain.I don¿t see any abnormality with the implants.Loosening is a well-known complication.Operative technique, soft tissue balancing and cementing technique are key in the longevity of a total knee replacement.Failures in revision and re-revision surgery can also be attributed to surgical technique and prosthetic selection (augments, gap balancing, restoration of joint line, etc.Device history review indicated the devices accepted into final stock from the reported lot were free from discrepancies.Complaint history review: there has been no other event for the lot referenced.Conclusions: it was reported that the patella had a scratch on it.The event was confirmed via clinician review.The exact cause of the event could not be determined.If further information becomes available or the product is returned, this investigation will be re-opened.
Event or Problem Description
It was reported that; after revision surgery, patient states that he continues to experience pain and swelling on left knee.Patient has had bone scans and is currently following up with surgeon as he states his knee feels loose.*update on 16-aug-2021: this pi is for the second revision on (b)(6) 2013.Per medical review, "the patient underwent a second revision on (b)(6) 2013 with a diagnosis of a painful unstable left total knee arthroplasty.At surgery they found that the femoral component was slightly elevated anteriorly and may have resulted in narrowing the patellofemoral space.They removed the femoral component there was some bone loss laterally and anteriorly and posteriorly, they found on the medial side the posterior condyle had not been fully resected and they downsized to a size 4.The tibial component was also loose.The patella had a scratch on it and they removed it.They then cemented a triathlon size 4 universal base plate and cemented a triathlon x3 symmetrical 9 mm thick patella.They used a size 4 ¿ 16mm total stabilized poly insert.".

• Brand Name: TRIATHLON SYMMETRIC X3 PATELLA
• 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: 12444876
• Report Number: 0002249697-2021-01527
• Device Sequence Number: 5003277
• Product Code: MBH
• UDI-Device Identifier: 07613327014754
• UDI-Public: 07613327014754
• Combination Product (Y/N): N
• Initial Reporter State: GA
• Initial Reporter Country: US
• PMA/510(K) Number: K141056
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2011
• Device Explanted Year: 2013
• Reporter Type: Manufacturer
• Report Source: consumer,other
• Initial Reporter Occupation: Other
• Type of Report: Initial
• Report Date (Section B): 09/09/2021

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: 10/09/2014
• Device Model Number: 5550-G-339
• Device Catalogue Number: 5550-G-339
• Device Lot Number: 969V
• Was Device Available for Evaluation?: No
• Type of Report(Section G): Initial
• Initial Date Received by Manufacturer: 08/16/2021
• Initial Report FDA Received Date: 09/09/2021
• 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
• Patient Weight: 100