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Related Experiment Videos

Computerized mechanical validation of custom-made stems

M Viceconti1, L Bellingeri, M Baleani

  • 1Laboratorio di Tecnologia dei Materiali, Istituti Ortopedici Rizzoli, Bologna.

La Chirurgia Degli Organi Di Movimento
|July 1, 1997
PubMed
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A new finite element analysis method accurately validates custom-made prostheses against European medical device laws. This method identified 3 of 15 critical implants failing to meet minimum mechanical resistance requirements.

Area of Science:

  • Biomedical Engineering
  • Medical Device Regulation
  • Orthopedic Surgery

Background:

  • New European community laws place responsibility on surgeons and manufacturers for custom-made medical devices.
  • Custom-made prostheses, produced as single models with short lead times, require specific validation methods.
  • Assessing the conformity of these custom devices to legal requirements is crucial.

Purpose of the Study:

  • To present a pre-clinical validation method for custom-made prostheses.
  • To ensure custom-made prostheses meet European legal standards for mechanical resistance.
  • To evaluate the reliability of a proposed finite element analysis (FEA) method.

Main Methods:

  • Development of a pre-clinical validation method based on finite element calculations.

Related Experiment Videos

  • Verification of the FEA method through in vitro measurements.
  • Application of the validated FEA method to 15 critical custom-made prosthesis cases (selected from 100 implanted stems).

    • Main Results:

    • The proposed finite element analysis method was confirmed as accurate and reliable for validating custom-made prostheses.
    • Analysis revealed that 3 out of the 15 critically selected custom-made prostheses exhibited mechanical resistance below the legal minimum.
    • The method effectively identified non-compliant devices among those with challenging size and geometrical irregularities.

    Conclusions:

    • The finite element analysis method provides a reliable approach for verifying custom-made prostheses against European medical device regulations.
    • The study highlights potential compliance issues in custom-made prostheses, emphasizing the need for rigorous pre-clinical validation.
    • This validated method supports surgeons and manufacturers in ensuring patient safety and adherence to legal standards for custom medical devices.