MAUDE Adverse Event Report: MEDACTA INTERNATIONAL SA AMISTEM-P COLLARED; AMISTEM-P COLLARED STD STEM SIZE 4

Model Number	01.18.434
Medical Device Problem Code	Osseointegration Problem (3003)
Health Effect - Clinical Code	Inadequate Osseointegration (2646)
Date of Event	02/04/2025
Type of Reportable Event	Serious Injury
Event or Problem Description
At about 2 years 10 months after the primary, the patient came in reporting pain due to a loose stem and the cause is unknown.The surgeon revised the stem and head with competitor components.The surgery was completed successfully.
Additional Manufacturer Narrative
Batch review performed on 06 february 2025.Lot 2111630: (b)(4) items manufactured and released on 22-dec-2021.Expiration date: 2026-12-08.No anomalies found related to the problem.To date, (b)(4) items of the same lot have been sold with no similar reported events during the period of review.Preliminary investigation performed by medacta r&d knee project manager: looking at the image attached to the complaint it is visible the expianted stem covered with patient blood.The stem neck is not visible because it is handled by the surgeon and also the tip is not visible.It is not possible to determine the root cause of reported complaint.

• Brand Name: AMISTEM-P COLLARED
• Common Device Name: AMISTEM-P COLLARED STD STEM SIZE 4
• Manufacturer (Section D): MEDACTA INTERNATIONAL SA; strada regina; castel san pietro, switzerland 6874 ; SZ 6874
• Manufacturer (Section G): MEDACTA INTERNATIONAL SA; strada regina; castel san pietro, switzerland 6874 ; SZ 6874
• Manufacturer Contact: marco giannessi ; strada regina; castel san pietro, switzerland 6874 ; SZ 6874
• MDR Report Key: 21467670
• Report Number: 3005180920-2025-00116
• Device Sequence Number: 3492202
• Product Code: LZO
• UDI-Device Identifier: 07630040720236
• UDI-Public: 07630040720236
• Combination Product (Y/N): N
• Initial Reporter State: MO
• Initial Reporter Country: US
• PMA/510(K) Number: K173794
• 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: Manufacturer
• Report Source: Company Representative
• Initial Reporter Occupation: Non-Healthcare Professional
• Type of Report: Initial
• Report Date (Section B): 02/26/2025

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?: No
• Operator of Device: Health Professional
• Device Model Number: 01.18.434
• Device Lot Number: 2111630
• Was Device Available for Evaluation?: No
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 02/04/2025
• Initial Report FDA Received Date: 02/26/2025
• Was Device Evaluated by Manufacturer? (Y/N): No
• Date Device Manufactured: 12/22/2021
• Is the Device Labeled for Single Use? (Y/N): Yes
• Usage of Device: Initial
• Patient Sequence Number: 1
• Outcome Attributed to Adverse Event: Required Intervention
• Patient Sex: Unknown