MAUDE Adverse Event Report: SMITH & NEPHEW, INC. LEGION PS OXIN FEM SZ7 RT; PROSTHESIS, KNEE, PATELLOFEMOROTIBIAL, SEMI-CONSTRAINED, CEMENTED, POLYMER/METAL

Model Number	71421207
Medical Device Problem Codes	Degraded (1153); Improper or Incorrect Procedure or Method (2017)
Health Effect - Clinical Code	Failure of Implant (1924)
Date of Event	10/23/2019
Type of Reportable Event	Serious Injury
Additional Manufacturer Narrative
Internal complaint reference: (b)(4).
Event or Problem Description
It was reported that after a tka surgery was performed on (b)(6) 2019 , it was identified that the lgn ps high flex xlpe sz 3-4 10mm was damaged and the coating on the legion ps oxin fem sz7 rt was completely worn off.This event was treated with a revision surgery on (b)(6) 2022.Patient current health status is unknown.
Additional Manufacturer Narrative
H3, h6.The associated device was returned and evaluated.A visual inspection of the device revealed damaged femoral coating, as well as deformation on the insert.All components were severely worn.A lab analysis performed on the device revealed that based on the observation of the retrieved parts, the poly insert was floating on the anterior aspects of the knee joint.The inferior-posterior surface of the insert was plastically deformed while the inferior-anterior surface was reasonably untouched indicating the insert was disassociated anteriorly.This condition allowed the knee femoral component to articulate directly on the tibial tray.Knowing the bulk hardness of zirconium ally is nearly 50% lower than that of the titanium alloy could result the notable femoral knee condyle.The disassociation of the insert from the tibial tray is possible when a wrong size combination is used in this case.The clinical/medical investigation concluded that, based on the provided chartstik photo and review of the lgn cr & ps fem/isrt interchangeability chart, a sizing discrepancy within the primary total knee construct was noted and would be related to user selection of components.The wear on the femoral component appears to be from direct femoral articulation onto the tibial baseplate.No contributing clinical factors can be definitively concluded based on the limited information provided.The patient impact included the primary total knee construct sizing discrepancy, significant component deformation and early revision.Further impact could not be determined.No further medical assessment can be rendered at this time.A review of the production order did not reveal a manufacturing abnormality that could have caused or contributed to the reported incident.A review of complaint history for the part number over the past 12 months and for the batch number based on historical data of the device did not reveal similar events for the listed device.A review of the instructions for use documents for knee systems reveal in warnings and precautions that the correct selection of the implant is extremely important.The appropriate type and size should be selected for patients with consideration of anatomical and biomechanical factors such as patient age and activity levels, weight, bone, and muscle conditions.Failure to use the optimum size component may result in a possible adverse effect.Higher rates of wear may shorten the useful life of the prosthesis, and lead to early revision surgery to replace the worn prosthetic components.A review of the risk management file revealed this failure mode was previously identified.The anticipated risk level is still adequate.A historical review concluded that there are no prior actions related to this product and event.At this time, we have no reason to suspect that the product failed to meet any specifications at the time of manufacture.The root cause of this event was determined to be wrong sizing combinations.Based on this investigation, the need for corrective action is not indicated.Should 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.H11.Corrected information in h6 (medical device problem code).

• Brand Name: LEGION PS OXIN FEM SZ7 RT
• Common Device Name: PROSTHESIS, KNEE, PATELLOFEMOROTIBIAL, SEMI-CONSTRAINED, CEMENTED, POLYMER/METAL
• Manufacturer (Section D): SMITH & NEPHEW, INC.; 1450 brooks rd.; memphis TN 38116
• Manufacturer (Section G): SMITH & NEPHEW, INC.; 1450 brooks rd.; memphis TN 38116
• Manufacturer Contact: holly topping ; 7000 west william cannon drive; austin, TX 78735 ; 5123913905
• MDR Report Key: 15665787
• Report Number: 1020279-2022-04558
• Device Sequence Number: 14140398
• Product Code: JWH
• UDI-Device Identifier: 00885556029404
• UDI-Public: 00885556029404
• Combination Product (Y/N): N
• Initial Reporter State: AR
• Initial Reporter Country: US
• PMA/510(K) Number: K043440
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2019
• Device Explanted Year: 2022
• Reporter Type: Manufacturer
• Report Source: Health Professional,Company Representative
• Initial Reporter Occupation: Physician
• Type of Report: Initial,Followup
• Report Date (Section B): 03/15/2023

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?: Yes
• Operator of Device: Health Professional
• Device Expiration Date: 02/09/2024
• Device Model Number: 71421207
• Device Catalogue Number: 71421207
• Device Lot Number: 14BM08175
• Was Device Available for Evaluation?: Device Returned to Manufacturer
• Date Returned to Manufacturer: 10/12/2022
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 10/03/2022
• Supplement Date Received by Manufacturer: 03/10/2023
• Initial Report FDA Received Date: 10/25/2022
• Supplement Report FDA Received Date: 03/15/2023
• Was Device Evaluated by Manufacturer? (Y/N): Device Not Returned to Manufacturer
• Date Device Manufactured: 02/11/2014
• 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
• Concomitant Medical Products and Therapy/Usage Dates: GEN II 7.5MM RESUR PAT 35MM, LOT#:19HM26155; GNS II CMT TIB SIZE 4 {} RIGHT, LOT#:G1915529
• Outcome Attributed to Adverse Event: Hospitalization; Required Intervention
• Patient Age: 48 YR
• Patient Sex: Female