MAUDE Adverse Event Report: ONKOS SURGICAL INC. ELEOS¿ LIMB SALVAGE SYSTEM; ELEOS¿ STEM EXTENSION17X140MM STRAIGHT, SPLINED, SLOTTED 17X140MM

Catalog Number	KSP16140E
Medical Device Problem Code	Adverse Event Without Identified Device or Use Problem (2993)
Health Effect - Clinical Code	Aseptic loosening (4883)
Date of Event	05/18/2026
Type of Reportable Event	Serious Injury
Additional Manufacturer Narrative
The root cause of this complaint was not determined.Based on the review of known device history records, the investigation concluded that the root cause of the loosening was not related to the design, manufacture, and/or sterilization of the revised implant.
Event or Problem Description
It was reported by an onkos sales representative, that a 55-year-old male patient with an eleos hinge knee replacement underwent revision on (b)(6) 2026 due to loosening of the femoral stem.Patient was experiencing pain at the knee, surgeon replaced stem component.This report captures eleos stem extension.This event will be reported as a serious injury due to the revision procedure.

• Brand Name: ELEOS¿ LIMB SALVAGE SYSTEM
• Common Device Name: ELEOS¿ STEM EXTENSION17X140MM STRAIGHT, SPLINED, SLOTTED 17X140MM
• Manufacturer (Section D): ONKOS SURGICAL INC.; 77 e halsey road; parsippany 07054
• Manufacturer Contact: yara neurauter ; 77 east halsey road; parsippany, NJ 07054
• MDR Report Key: 25457354
• Report Number: 3013450937-2026-00232
• Device Sequence Number: 8708796
• Product Code: KRO
• UDI-Device Identifier: B278KSP16140E0
• UDI-Public: B278KSP16140E0
• Combination Product (Y/N): Y
• Initial Reporter State: CA
• Initial Reporter Country: US
• PMA/510(K) Number: K161520
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2022
• Device Explanted Year: 2026
• Serviced by Third Party (Y/N): N
• Reporter Type: Manufacturer
• Report Source: Company Representative
• Initial Reporter Occupation: Other Health Care Professional
• Type of Report: Initial
• Report Date (Section B): 06/10/2026

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
• Device Expiration Date: 06/21/2025
• Device Catalogue Number: KSP16140E
• Device Lot Number: 17146771764753
• 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: 05/14/2026
• Initial Report FDA Received Date: 06/10/2026
• Was Device Evaluated by Manufacturer? (Y/N): No
• Date Device Manufactured: 06/21/2017
• 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
• Outcome Attributed to Adverse Event: Required Intervention
• Patient Age: 55 YR
• Patient Sex: Male