MAUDE Adverse Event Report: SMITH & NEPHEW, INC. LGN OX CONSTRAINED FEM 3 LT; PROSTHESIS, KNEE, PATELLOFEMOROTIBIAL, SEMI-CONSTRAINED, CEMENTED, POLYMER/METAL

Catalog Number	71421163
Medical Device Problem Code	Adverse Event Without Identified Device or Use Problem (2993)
Health Effect - Clinical Code	Septic loosening (4884)
Date of Event	11/20/2025
Type of Reportable Event	Serious Injury
Additional Manufacturer Narrative
Corrected data: e4 (initial reporter also sent report to fda?) updated from "yes" to "no".Additional information: h6 (type of investigation) , h11 (roi).H3, h6: the devices were not returned for evaluation; therefore, a device analysis could not be performed.A review of the production orders did not reveal a manufacturing abnormality that could have caused or contributed to the reported incident.A review of complaint history for the part numbers over the past 12 months and for the batch numbers based on historical data of the devices did not reveal similar events for the listed devices.A review of the instructions for use documents for knee systems revealed that acute post-surgical wound infection has been identified as a possible adverse effect.Active, local infection or previous intra-articular infections are identified in contraindications for total knee replacement.As well, the possible adverse effects section states that looseness of components can result from trauma, improper implant selection, improper implant positioning, improper fixation, and/or migration of the components.Muscle and fibrous tissue laxity can also contribute to these conditions.A review of the risk management files revealed these failure modes were previously identified.The anticipated risk level is still adequate.A historical review concluded that there are no prior actions related to this products and event.A review of the sterilization records revealed the batches were sterilized within normal parameters.At this time, we have no evidence to conclude that the products failed to meet any specifications at the time of manufacture.Factors that could contribute to the reported event include loss of sterility during procedure, post-operative healing issue, injury, patient condition and/or medical history.Based on this investigation, the need for corrective action is not indicated.Should the devices 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.
Additional Manufacturer Narrative
Internal complaint reference: (b)(4).This complaint was opened by smith+nephew to document a patient complication reported that includes reference to the use of a smith+nephew product without evidence about a specific product problem.The reported complication relates to known inherent procedural risks that are appropriately documented in our risk files.Smith+nephew will continue to monitor trends in accordance with our post-market surveillance process and take necessary action as required if anticipated severity and/or occurrence rates are exceeded.Smith+nephew has no reason to suspect that the product failed to meet any specifications at the time of manufacture.Based on our review of all currently available information, we are unable to confirm a relationship between the reported event and the device or identify a definitive root cause.However, as the use of our product cannot be excluded as a potential cause or contributory factor to the reported issue, we are submitting this report in accordance with applicable regulations.If additional investigative findings or information becomes available that alters the conclusions of this report, a follow-up report will be submitted as required.
Event or Problem Description
It was reported that, after a tka surgery was performed on (b)(6) 2025, the patient experienced septic mobilization.This adverse event was treated by a revision surgery on (b)(6) 2025, in which a lgn ox constrained fem 3 lt, lgn rev tibia base sz 3 lt, legion con art ins 9mm sz 3-4, lgn pressfit stem 16mm x 120mm, lgn cement stem12mmx160mm strt and a lgn scrw dis fem wdg sz3 5m were exchanged.Patient's current health status is unknown.

• Brand Name: LGN OX CONSTRAINED FEM 3 LT
• 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 ; 1450 brooks rd.; memphis, TN 38116 ; 5123913905
• MDR Report Key: 23898365
• Report Number: 1020279-2025-02122
• Device Sequence Number: 10116869
• Product Code: JWH
• UDI-Device Identifier: 03596010543820
• UDI-Public: 3596010543820
• Combination Product (Y/N): N
• Initial Reporter Country: IT
• PMA/510(K) Number: K230653
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2025
• Device Explanted Year: 2025
• Serviced by Third Party (Y/N): N
• Reporter Type: Manufacturer
• Report Source: Other,Foreign,Health Professional,Company Representative
• Initial Reporter Occupation: Other Health Care Professional
• Type of Report: Initial,Followup
• Report Date (Section B): 01/22/2026

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 Catalogue Number: 71421163
• Device Lot Number: 24HM08416
• Was Device Available for Evaluation?: Yes
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 12/08/2025
• Supplement Date Received by Manufacturer: Not provided
• Initial Report FDA Received Date: 12/26/2025
• Supplement Report FDA Received Date: 01/22/2026
• Was Device Evaluated by Manufacturer? (Y/N): Device Not Returned to Manufacturer
• Date Device Manufactured: 08/14/2024
• 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: LEGION CON ART INS 9MM SZ 3-4: 71420523, 24AT79170.; LGN CEMENT STEM12MMX160MM: 71424204, 24CAP0188A.; LGN PRESSFIT STEM 16MM X 120MM:71424029, 24JAB0002.; LGN REV TIBIA BASE SZ 3 LT: 71424003, 24LM01446.; LGN SCRW DIS FEM WDG SZ3 5MM: 71421657, 24DSM0112.
• Outcome Attributed to Adverse Event: Hospitalization; Required Intervention
• Patient Age: 72 YR
• Patient Sex: Unknown