M.U.S.T. PEDICLE SCREW SYSTEM
Report
- Report Number
- 3005180920-2026-00139
- Event Type
- Injury
- Date Received
- February 26, 2026
- Date of Event
- January 27, 2026
- Report Date
- March 31, 2026
- Manufacturer
- MEDACTA INTERNATIONAL SA
- Product Code
- PML
- UDI-DI
- 07630030862113
- PMA / PMN Number
- K241034
- Adverse Event
- Yes
- Report Source
- Manufacturer report
- Reporter Occupation
- 003
Narratives
BATCH REVIEW PERFORMED ON 11 FEBR 2026. PEDICLE SCREW 03.61.323 FENESTRATED POLYAX. CANN. PED. SCR. 6X40, DUAL-DIAM (K241034) LOT 2121468: (B)(4) ITEMS MANUFACTURED AND RELEASED ON 06-APR-2021. EXPIRATION DATE: 2026-MAR-17. NO ANOMALIES FOUND RELATED TO THE PROBLEM. TO DATE, ALL ITEMS OF THE SAME LOT HAVE BEEN SOLD WITH NO SIMILAR REPORTED EVENT DURING THE PERIOD OF REVIEW. PEDICLE SCREW 03.52.323 ENH. CANN. PEDICLE SCREW 6X40MM + NUT (1X) STERILE (K141988) LOT 1923108: (B)(4) ITEMS MANUFACTURED AND RELEASED ON 21-OCT-2019. EXPIRATION DATE: 2024-OCT-02. NO ANOMALIES FOUND RELATED TO THE PROBLEM. TO DATE, (B)(4) ITEMS OF THE SAME LOT HAVE BEEN SOLD WITH NO SIMILAR REPORTED EVENT DURING THE PERIOD OF REVIEW. PEDICLE SCREW 03.61.325 FENESTRATED POLYAX. CANN. PED. SCR. 6X50, DUAL-DIAM (K241034) LOT 2126544: (B)(4) ITEMS MANUFACTURED AND RELEASED ON 29-NOV-2021. EXPIRATION DATE: 2026-NOV-15. NO ANOMALIES FOUND RELATED TO THE PROBLEM. TO DATE, ALL ITEMS OF THE SAME LOT HAVE BEEN SOLD WITH NO SIMILAR REPORTED EVENT DURING THE PERIOD OF REVIEW. CLINICAL EVALUATION PERFORMED BY CLINICAL AFFAIRS DEPARTMENT. A REVISION SURGERY WAS PERFORMED APPROXIMATELY 3.5 YEARS AFTER A PREVIOUS L4-L5 FUSION DUE TO SCREW BREAKAGE. THE AVAILABLE X-RAY IMAGES CLEARLY CONFIRM THE FAILURE, SHOWING BREAKAGE OF TWO SCREWS AT L5 AND ONE SCREW AT L4, SPECIFICALLY AT THE JUNCTION BETWEEN THE HEAD AND THE SHAFT. PEDICLE SCREWS ARE SUSCEPTIBLE TO FATIGUE FRACTURES WHEN OSSEOUS FUSION DOES NOT OCCUR, AND THE DEVICE REMAINS UNDER CONTINUOUS MECHANICAL STRESS. THIS MECHANISM IS LIKELY RESPONSIBLE FOR THE OBSERVED SCREW FRACTURES; HOWEVER, BASED ON THE INFORMATION PROVIDED, A DEFINITIVE CONCLUSION REGARDING THE UNDERLYING CAUSE CANNOT BE ESTABLISHED.
ON THE 02 MARCH 2026 WE HAVE RECEIVED THE ITEM FOR INSPECTION VISUAL INSPECTION PERFORMED BY R&D PROJECT MANAGER: THREE SCREWS WERE RECEIVED, AND ALL PRESENT A FRACTURE BELOW THE HEAD. THE MOST PROBABLE ROOT CAUSE IS LACK OF FUSION, WHICH LIKELY LED TO FATIGUE UNDER CYCLIC LOADING OF THE SCREW. THIS CAUSED DAMAGE TO THE IMPLANT, OCCURRING AT A STRESS LEVEL BELOW THE MATERIAL'S ULTIMATE STRENGTH. IN THE CROSS-SECTIONAL AREA AT THE FRACTURE LOCATION, TWO DISTINCT REGIONS CAN BE OBSERVED, WHICH ARE TYPICAL OF A FATIGUE FRACTURE: THE FIRST ONE IS SMOOTHER AND RELATIVELY FLAT, WHILE THE SECOND ONE IS ROUGHER AND MORE IRREGULAR, CORRESPONDING TO THE FINAL RAPID FRACTURE ZONE. ROOT CAUSE: THE MOST PLAUSIBLE CONTRIBUTING FACTOR IS THE LACK OF SOLID OSSEOUS FUSION POSTOPERATIVELY, WHICH MAY HAVE RESULTED IN INCREASED MECHANICAL LOADING ON THE SCREWS UNDER PHYSIOLOGICAL CONDITIONS, POTENTIALLY LEADING TO FATIGUE CRACK INITIATION AND EVENTUAL BREAKAGE. WHILE THE EXACT ROOT CAUSE CANNOT BE DEFINITIVELY CONFIRMED, THE INVESTIGATION FOUND NO EVIDENCE OF MANUFACTURING DEFECTS OR SYSTEMIC ISSUES RELATED TO THE DEVICES.
PRIMARY SURGERY PERFORMED ON (B)(6) 2022. SINGLE-SEGMENT SPONDYLODESIS L4-5 WITH MYSPINE MC, MUST + MECTALIF OBLIQUE. FIRST REVISION SURGERYPERFORMED ON (B)(6) 2022 DUE TO VENTRAL CAGE MIGRATION (MDR (B)(4). SECOND REVISION SURGERY PERFORMED ON (B)(6) 2026 DUE TOTHE BREAKAGE OF THREE SCREWS.
Devices
| Seq | Brand | Generic | Product Code | Manufacturer | Model | Lot | UDI-DI |
|---|---|---|---|---|---|---|---|
| 519762 | M.U.S.T. PEDICLE SCREW SYSTEM | FENESTRATED POLYAX. CANN. PED. SCR. 6X40,DUAL-DIAM | PML | MEDACTA INTERNATIONAL SA | 03.61.323 | 2121468 | 07630030862113 |
Patients
| Seq | Age | Sex | Outcome | Treatment |
|---|---|---|---|---|
| 1 | NA | Unknown | Required Intervention |