MAUDE Adverse Event Report: MEDACTA INTERNATIONAL SA MUST LT 25MM LONG - PEDICLE SCREW Ø5X45 FENESTRATED

Model Number 03.57.025

Device Problem Appropriate Term/Code Not Available (3191)

Patient Problem Insufficient Information (4580)

Event Date 11/11/2021

Event Type  Injury  

Manufacturer Narrative

Product code, k number and udi number are from must lt not fenestrated because must lt fenestrated is not registered in usa but the set screws are the same used in must lt not fenestrated.In this event, 2 set screws unscrewed.Four pedicle screws were revised.It is not known which of all the implants have been revised.Clinical evaluation performed by medical affairs director.In a long spinal stabilization surgery, two pedicle screws are implanted too deep and cannot be reached by the long rods.The set screws were implanted all the same but could not be properly tightened and therefore got loose.Subsequent surgery took away the loose screws but could not push the rod to reach the deep pedicle screws.The cause for the second surgery is not to be sought in a defective implant.Batch review performed on 06-december-2021.Lot 2024208: (b)(4) items manufactured and released on 29-sep-2021.Expiration date: 2026-06-29.No anomalies found related to the problem.To date, (b)(4) items of the same lot have been sold without any similar reported event.Other components potentially involved: must lt 03.79.215 must lt 25mm long - pedicle screw ø5x45 fenestrated lot.2024202.Lot 2024202: (b)(4) items manufactured and released on 30-sep-2021.Expiration date: 2026-06-29.No anomalies found related to the problem.To date, (b)(4) items of the same lot have been sold without any similar reported event.Must lt 03.79.226 must lt 25mm long - pedicle screw ø6x50 fenestrated lot.2123538.Lot 2123538: (b)(4) items manufactured and released on 06-sep-2021.Expiration date: 2026-08-18.No anomalies found related to the problem.To date, (b)(4) items of the same lot have been sold without any similar reported event.Must lt 03.79.226 must lt 25mm long - pedicle screw ø6x50 fenestrated lot.2123539.Lot 2123539: (b)(4) items manufactured and released on 06-sep-2021.Expiration date: 2026-08-18.No anomalies found related to the problem.To date, (b)(4) items of the same lot have been sold without any similar reported event.Must lt 03.79.236 must lt 25mm long - pedicle screw ø7x50 fenestrated lot.2123548.Lot 2123548: (b)(4) items manufactured and released on 29-sep-2021.Expiration date: 2026-07-12.No anomalies found related to the problem.To date, (b)(4) items of the same lot have been sold without any similar reported event.

Event Description

A long-construct must lt surgery without any final x-rays control has been completed.After the patient was repositioned to the side for the vertebral body replacement, an intraoperative ct scan was performed and it was discovered that two must lt set screws were unscrewed.The must lt instruments were unsterile, so, no repositioning was possible.Revision surgery was then performed removing the two setscrews plus four pedicle screw.Given that one pedicle screw was too deep was left without the set screw and was not removed.The rod was left and it was not fixed in some points.

Manufacturer Narrative

Visual inspection performed by r&d spine manager.The screw, inlay, and pedicle head are disassembled.The root cause of the disassembling could be related to the extreme maneuver to remove the screw in the revision surgery without removing the rod.The root cause of the event seems related to the anatomy of the patient and the impossibility for the surgeon to reduce the rod inside the pedicle screw head.The high stiffness of the column of the patient, probably due to bone structure, resulted in an incomplete reduction of the rod and a final tightening of the set screw in the middle of the tabs.The removal of the tabs in this condition unintentionally releases the setscrew in the soft tissue because there is no more constraint from the thread.

• Brand Name: MUST LT 25MM LONG - PEDICLE SCREW Ø5X45 FENESTRATED
• Type of Device: PEDICLE SCREW
• Manufacturer (Section D): MEDACTA INTERNATIONAL SA; strada regina; castel san pietro, 6874 ; SZ 6874
• Manufacturer (Section G): MEDACTA INTERNATIONAL SA; strada regina; castel san pietro, 6874 ; SZ 6874
• Manufacturer Contact: stefano baj ; strada regina; castel san pietro, switzerland 6874 ; SZ 6874
• MDR Report Key: 12948213
• MDR Text Key: 281832169
• Report Number: 3005180920-2021-00953
• Device Sequence Number: 1
• Product Code: NKB
• UDI-Device Identifier: 07630971278394
• UDI-Public: 07630971278394
• Combination Product (y/n): N
• Reporter Country Code: GM
• PMA/PMN Number: K203482
• Number of Events Reported: 1
• Summary Report (Y/N): N
• Report Source: Manufacturer
• Source Type: Company Representative
• Reporter Occupation: Non-Healthcare Professional
• Type of Report: Initial,Followup,Followup
• Report Date: 02/25/2022

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Date FDA Received: 12/07/2021
• Is this an Adverse Event Report?: Yes
• Is this a Product Problem Report?: No
• Device Operator: Health Professional
• Device Model Number: 03.57.025
• Device Catalogue Number: 03.79.225
• Device Lot Number: 2024208
• Was Device Available for Evaluation?: Device Returned to Manufacturer
• Date Returned to Manufacturer: 12/16/2021
• Date Manufacturer Received: 11/09/2021
• Was Device Evaluated by Manufacturer?: Yes
• Date Device Manufactured: 09/29/2021
• Is the Device Single Use?: Yes
• Is This a Reprocessed and Reused Single-Use Device?: No
• Type of Device Usage: Initial
• Patient Sequence Number: 1
• Patient Outcome(s): Required Intervention
• Patient Sex: Male