MAUDE Adverse Event Report: AESCULAP AG AS VEGA SYSTEM® PS; PROSTHESIS, KNEE, PATELLOFEMOROTIBIAL, SEMI-CONSTRAINED, CEMENTED, POLYMER/METAL

Model Number	NX029Z
Medical Device Problem Code	Loosening of Implant Not Related to Bone-Ingrowth (4002)
Health Effect - Clinical Code	Failure of Implant (1924)
Type of Reportable Event	Serious Injury
Event or Problem Description
It was reported that there was an issue with a component of columbus knee system.According to the complaint description, this knee implant was "defective and failed prematurely because the ceramic coated surface fails to properly adhere to the cement".There was postoperative mechanical loosening.It was noted that the surgeon easily removed the implant by hand during the revision.Additional information was not provided.
Additional Manufacturer Narrative
The adverse event is filed under aesculap reference no.(b)(4).Investigation on-going.Should relevant additional information / investigation results become available, a supplemental medwatch report will be submitted.
Additional Manufacturer Narrative
The adverse event is filed under aesculap reference number: (b)(4).Investigation results: the device was not returned to the manufacturer for physical evaluation.Additionally, no on-site evaluation of the unit was performed and no parts were returned for failure analysis.Therefore, the investigation was not able to confirm a device issue that could be associated with the reported event.Batch history review: the device history records (dhr) were not able to be reviewed as no lot number was made available.However, all device history records (dhr) are reviewed and released according to documented procedures and a device is not released if it does not meet requirements or is nonconforming.Conclusion and measures/preventative measures: a definitive conclusion regarding the complaint incident cannot be reached without a physical examination of the complaint device.
Additional Manufacturer Narrative
The adverse event is filed under ais reference no.(b)(4).Correction: patient identifier.Additional information a3a patient sex b5 event description updated d1, d2, d4 suspected medical device information d6a, d6b implant and explant date f9 approximate age of device.
Event or Problem Description
The patient presented with mechanical loosening of a prior total knee arthroplasty.On (b)(6) 2025, the patient underwent revision total knee arthroplasty of the right knee for loosening of prior components.Intraoperatively, both the tibial and femoral implants were found to be loose with evidence of cement debonding.Only 5-10% of the surface had residual cement adhesion.The femoral component was removed with minimal effort using gentle taps, and the tibial implant was also easily removed, consistent with failure of fixation at the cement interface.The femur and tibia were then re-prepared.An intramedullary guide was placed, and trailing confirmed alignment and stability.Final components were implanted using third-generation vacuum-mixed bone cement with digital impaction.A polyethylene insert was placed, and stability was confirmed with varus/valgus and full range of motion testing.Vancomycin powder was applied, the wound was irrigated and closed in layers, and a sterile dressing was applied.The patient tolerated the procedure and was transferred to pacu in stable condition.
Additional Manufacturer Narrative
The adverse event is filed under ais reference no.(b)(4).Manufacturing site evaluation: the device was not returned to the manufacturer for physical evaluation.Additionally, no on-site evaluation of the unit was performed and no parts were returned for failure analysis.Therefore, the investigation was not able to confirm a device issue that could be associated with the reported event.The device history records (dhr) were reviewed for the available lot number; the device was found to be within specification at the time of production.All device history records (dhr) are reviewed and released according to documented procedures and a device is not released if it does not meet requirements or is nonconforming.A definitive conclusion regarding the complaint incident cannot be reached without a physical examination of the complaint device.
Event or Problem Description
On (b)(6) 2020, the patient underwent right knee manipulation under anesthesia for right knee stiffness after total knee arthroplasty (tka).On (b)(6) 2023, the patellar button was replaced due to aseptic loosening.Findings during the revision on (b)(6) 2025 included debonding of cement from tibia and femur, grossly loose tibia and femur; non-aesculap implants were used instead.Another right knee manipulation under anesthesia for right knee stiffness was performed on (b)(6) 2025.
Additional Manufacturer Narrative
The adverse event is filed under ais reference number (b)(4).
Additional Manufacturer Narrative
The adverse event is filed under ais reference no.(b)(4).Investigation results: the complained medical device was not made available for investigation.The investigation was based upon batch history review, historical data analysis, event description and review of a pictures.The provided pictures show the following situation: the femoral component (nx029z) as well as the tibial component (nx051z) shows only partial bone cement on the intended area.The meniscal component is still fixed on the tibial component.The device quality and manufacturing history records have been checked for the available lot number and were found to be according to the manufacturer's specifications, valid at the time of production.Review of the complaint history revealed that there are no similar complaints filed against the affected batch number.Conclusion/preventive measures: on the basis of the current information and without the complained medical device being available for investigation, a clear root cause cannot be drawn.In the event that the complained medical device will be provided for investigation in the future, an update of this report will be provided unsolicited.

• Brand Name: AS VEGA SYSTEM® PS
• Common Device Name: PROSTHESIS, KNEE, PATELLOFEMOROTIBIAL, SEMI-CONSTRAINED, CEMENTED, POLYMER/METAL
• Manufacturer (Section D): AESCULAP AG; po box 40; tuttlingen, 78501 ; GM 78501
• MDR Report Key: 22206548
• Report Number: 3005673311-2025-00049
• Device Sequence Number: 20522051
• Product Code: JWH
• UDI-Device Identifier: 04046963810122
• UDI-Public: (01)04046963810122(11)190228(17)290227(10)52501006
• Combination Product (Y/N): N
• Initial Reporter Country: US
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2022
• Device Explanted Year: 2025
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Importer
• Initial Reporter Occupation: Other
• Type of Report: Initial,Followup,Followup,Followup,Followup
• Report Date (Section B): 04/06/2026
• Report Date (Section F): 06/13/2025

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 Model Number: NX029Z
• Device Catalogue Number: NX029Z
• Device Lot Number: 52501006
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: No
• Was the Report Sent to FDA?: Yes
• Distributor Facility Aware Date: 05/22/2025
• Device Age: 69 MO
• Event Location: Hospital
• Date Report to Manufacturer: 05/22/2025
• Type of Report(Section G): Follow-Up
• Initial Date Received by Manufacturer: Not provided
• Supplement Date Received by Manufacturer: Not provided; Not provided; Not provided; Not provided; Not provided
• Initial Report FDA Received Date: 06/13/2025
• Supplement Report FDA Received Date: 06/27/2025; 09/08/2025; 10/02/2025; 12/11/2025; 04/06/2026
• 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: Required Intervention
• Patient Age: 77 YR
• Patient Sex: Female
• Date Report Sent to FDA: 06/13/2025