MAUDE Adverse Event Report: Medacta International SA AMIStem H Collared Femoral Stems; AMIStem Collared HA coated stem Size 00 STD

Model Number	01.18.229
Medical Device Problem Code	Osseointegration Problem (3003)
Health Effect - Clinical Code	Aseptic loosening (4883)
Date of Event	08/11/2026
Type of Reportable Event	Serious Injury
Event or Problem Description
At9 years 6 months from the primary, the patient came in presenting instability due to a loose stem and the cause is unknown.The surgeon revised the amistem h collared 00 stem and 28mm biolox head s to a competitor stem and head.The surgeon revised the dm liner hc 52/28 to a double mobility hc liner d 28/dmf.The surgery was completed successfully.
Additional Manufacturer Narrative
Batch review performed on 13 aug 2026 lot 144508: (b)(6) items manufactured and released on 15-sept-2014.Expiration date: 2019-aug-31.No anomalies found related to the problem.To date, (b)(6) items of the same lot have been sold with no similar reported event during the period of review.Root cause:aseptic loosening is possible literature described adverse event after primary joint arthroplasties and causes are often unknown.There is no indication that any potential issue with the device may have caused or contributed to the event and the investigation does not indicate any potential manufacturing related issue or systemic deficiency.

• Brand Name: AMIStem H Collared Femoral Stems
• Common Device Name: AMIStem Collared HA coated stem Size 00 STD
• Manufacturer (Section D): Medacta International SA; strada regina; castel san pietro 6874 ; SZ 6874
• Manufacturer Contact: marco giannessi ; strada regina; castel san pietro 6874 ; SZ 6874
• MDR Report Key: 50474970
• Report Number: 3005180920-2026-00875
• Device Sequence Number: 10395932
• Product Code: LZO
• UDI-Device Identifier: 07630030804540
• UDI-Public: 07630030804540
• Combination Product (Y/N): N
• PMA/510(K) Number: K121011
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Device Implanted Year: 2017
• Device Explanted Year: 2026
• Serviced by Third Party (Y/N): N
• Reporter Type: Manufacturer
• Report Source: Company Representative
• Type of Report: Initial
• Report Date (Section B): 08/27/2026

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
• Operator of Device: Health Professional
• Device Expiration Date: 08/31/2019
• Device Model Number: 01.18.229
• Device Lot Number: 144508
• Was Device Available for Evaluation?: No
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 08/11/2026
• Initial Report FDA Received Date: 08/27/2026
• Was Device Evaluated by Manufacturer? (Y/N): Device Not Returned to Manufacturer
• Date Device Manufactured: 09/15/2014
• 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: 43 YR
• Patient Sex: Female