MAUDE Adverse Event Report: SMITH & NEPHEW, INC. LEGION PS OXIN FEM SZ8 LT; PROSTHESIS,KNEE,PATELLOFEMOROTIBIAL,SEMICONSTRAINED,CEMENTED,POLYMERMETALPOLYMER

Model Number	71421218
Medical Device Problem Code	Unintended System Motion (1430)
Health Effect - Clinical Codes	Joint Dislocation (2374); Subluxation (4525)
Date of Event	12/08/2021
Type of Reportable Event	Serious Injury
Event or Problem Description
It was reported that, after a tka surgery, the patient had recurrent patella subluxation/ dislocation.It was previously treated with extensor mechanism repair 1.5 years ago, but it failed.At the time, surgeon attributed the problem to the legion ps oxinium femoral sz 8 left (-1) for possible malrotation.On (b)(6) 2021, the patient underwent a revision surgery where the legion ps oxinium femoral sz 8 left ((b)(4)) and the gii ps high flexion insert sz 7-8 13mm ((b)(4)) were exchanged.More external rotation was applied to the femoral component and tibial tubercle transfer and extensor mechanism repair were performed.Also, it was noted that prior to primary tkr, patient had both femoral and tibial osteotomies.Surgeon commented that this may be attributable to outcomes, as anatomy 'distorted'.Current health status of the patient is unknown.
Additional Manufacturer Narrative
Internal complaint reference (b)(4).
Additional Manufacturer Narrative
H3, h6: the device was not returned for evaluation and the reported event could not be confirmed.The clinical/medical investigation concluded that, without the additional requested clinically relevant information for evaluation, the root cause of the reported ¿patient experienced recurrent patella subluxation/dislocation,¿ and failed extensor mechanism cannot be definitively concluded.However, ¿it was noted that prior to primary tkr, patient had both femoral and tibial osteotomies.Surgeon commented that this may be attributable to outcomes, as anatomy 'distorted'.¿ and the patient¿s current health status remains unknown.The patient impact beyond the reported ¿recurrent patella subluxation/dislocation, failed extensor mechanism, and revision cannot be determined.No further medical assessment could be rendered at this time.A review of complaint history did not reveal similar events for the listed device.A review of the instructions for use document and risk management file revealed this failure mode was previously identified.The anticipated risk level is still adequate.An 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 product specifications at the time of manufacture.The contribution of the device to the reported event could not be corroborated.Possible causes could include but are not limited to traumatic injury, patient condition, lack of ingrowth, sizing issue or alignment.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.

• Brand Name: LEGION PS OXIN FEM SZ8 LT
• Common Device Name: PROSTHESIS,KNEE,PATELLOFEMOROTIBIAL,SEMICONSTRAINED,CEMENTED,POLYMERMETALPOLYMER
• 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: 13095087
• Report Number: 1020279-2021-08895
• Device Sequence Number: 11810346
• Product Code: JWH
• UDI-Device Identifier: 00885556031179
• UDI-Public: 00885556031179
• Combination Product (Y/N): N
• Initial Reporter Country: AS
• PMA/510(K) Number: K043440
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Explanted Year: 2021
• Reporter Type: Manufacturer
• Report Source: Other,Foreign,Health Professional
• Initial Reporter Occupation: Physician
• Type of Report: Initial,Followup
• Report Date (Section B): 02/10/2022

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 Model Number: 71421218
• Device Catalogue Number: 71421218
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 12/08/2021
• Supplement Date Received by Manufacturer: 02/08/2022
• Initial Report FDA Received Date: 12/28/2021
• Supplement Report FDA Received Date: 02/10/2022
• Was Device Evaluated by Manufacturer? (Y/N): No
• 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: A
• Patient Sequence Number: 1
• Patient Sex: Male