MAUDE Adverse Event Report: SMITH & NEPHEW, INC. JII UNI TIB BASE SZ 2 LM/RL; PROSTHESIS, KNEE, FEMOROTIBIAL, NON-CONSTRAINED, CEMENTED,

Model Number 71935194

Device Problem Adverse Event Without Identified Device or Use Problem (2993)

Patient Problems Synovitis (2094); Metal Related Pathology (4530)

Event Date 10/27/2020

Event Type  Injury  

Manufacturer Narrative

(b)(4).

Event Description

It was reported that on (b)(6) 2020, a regular post operative assessment of the patient was performed.The patient was found with severe arthro-synovitis and a radiograph picture suggested probable metallosis and radio opaque deposits at the synovial level.A revision surgery was scheduled for urgent surgical cleaning and implant removal.On (b)(6) 2020, the revision surgery was performed to remove baker cyst and the implants, which were replaced with a mono-compartmental spacer with antibiotic-loaded cement.During surgery, an intracapsular metalogic synovitis (also near the baker cyst) was noticed.Also, the following implant failures were remarqued: degeneration of the polyethylene insert in the back side; consumption of the ceramic and metal coating below the distal region of the prosthetic femoral condyle; and consumption of the metal part in the back side of the tibial component.

Manufacturer Narrative

The device, used in treatment, was not returned for evaluation and the reported event could not be confirmed.The clinical/medical investigation concluded that, based on the information provided and without imaging, the definitive root cause of the described metal-on-metal (mom) articulation with synovitis and signs of metallosis with distal (posterior) deformation of all 3 components could not be concluded.The reported disease progression could not be ruled out as a contributing factor.Mom articulation may unfortunately result from component loosening, prolonged ambulation with an anteriorly dislocated articulating insert, or possibly as a result of aggressive wear from extensive 3rd body debris, and/or the ¿suspected mechanical complications¿; however, per correspondence, there was no traumatic event/accident involved and the surgeon did not fault the devices.Therefore, it is suspect if there was either infection/septic joint, loosening, or if the articulating insert was initially locked into the tibial baseplate.The patient impact beyond the reported clinical findings and the subsequent revision with placement of an antibiotic spacer could not be concluded, although it was communicated that the patient¿s current health is ¿positive¿.Should clinical documentation, explant return and/or additional information become available, the clinical/medical assessment may be re-evaluated.A review of the manufacturing records did not reveal a manufacturing abnormality that could have caused or contributed to the reported incident.A review of complaint history did not reveal additional complaints for the listed batch.A review of the risk management file and instructions for use documents revealed this failure mode was previously identified.At this time, we have no reason to suspect that the product failed to meet any product specifications at the time of manufacture.Some potential probable causes for this event could include material in use, patient reaction, damaged product, implant corrosion or wear.Based on this investigation, the need for corrective action is not indicated.Without the return of the actual product involved, our investigation could not proceed.Should the device or additional information be received, the complaint will be reopened.No further investigation is warranted for this complaint; however, we will continue to monitor for future complaints and investigate as necessary.We consider this investigation closed.

• Brand Name: JII UNI TIB BASE SZ 2 LM/RL
• Type of Device: PROSTHESIS, KNEE, FEMOROTIBIAL, NON-CONSTRAINED, CEMENTED,
• Manufacturer (Section D): SMITH & NEPHEW, INC.; 1450 brooks rd.; memphis TN 38116
• MDR Report Key: 10956377
• MDR Text Key: 219868613
• Report Number: 1020279-2020-07044
• Device Sequence Number: 1
• Product Code: HSX
• UDI-Device Identifier: 00885556578735
• UDI-Public: 00885556578735
• Combination Product (y/n): N
• PMA/PMN Number: K152315
• Number of Events Reported: 1
• Summary Report (Y/N): N
• Report Source: Manufacturer
• Source Type: company representative,foreig
• Type of Report: Initial,Followup
• Report Date: 08/20/2021

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Date FDA Received: 12/07/2020
• Is this an Adverse Event Report?: Yes
• Is this a Product Problem Report?: No
• Device Operator: Lay User/Patient
• Device Model Number: 71935194
• Device Catalogue Number: 71935194
• Device Lot Number: 19DAP0189A
• Was Device Available for Evaluation?: No
• Date Manufacturer Received: 08/19/2021
• Is This a Reprocessed and Reused Single-Use Device?: No
• Patient Sequence Number: 1
• Patient Outcome(s): Hospitalization; Required Intervention
• Patient Age: 76 YR