Standard Test Method for Measuring Fretting Corrosion of Osteosynthesis Plates and Screws

Importancia y uso:

4.1 It is well known from examination of implants after use that plates and screws used for osteosynthesis are subjected to metal loss due to corrosion at the plate-screw interfaces. One of the mechanisms of this corrosive attack is fretting corrosion due to relative motion (micromotion) between the screw heads and plate-hole countersinks.

4.2 It is also known that release of corrosion products into the tissues surrounding an implant may have adverse effects on local tissue or have systemic effects. Thus, it is important to minimize the amount of tissue exposure to corrosion products.

4.3 Screws and plates are available in different configurations in accordance with Specifications F543 and F382. This test method may be used to evaluate the effects of different combinations of screw and plate designs. As new materials and device designs are developed for use in the treatment of fractured bones, it is important to determine the effects these developments have on the amount of metal loss due to fretting corrosion.

4.4 This test method provides a standardized screening test for ranking metal plates and screws in terms of resistance to fretting corrosion and for determining the influence of different solutions on fretting corrosion rates.

4.5 This test method may also be used to generate corrosion products either for chemical analysis of the products or for testing for biological reactions to corrosion products using animal or cell culture methods.

4.6 It is well known that fretting corrosion rates depend on normal load or pressure, frequency, sliding amplitude, materials, surface treatments, and environmental factors. (4) Therefore, when determining the effect of changing one of these parameters (for example, material or environment), all others must be kept constant to facilitate interpretation of the results.

Subcomité:

F04.15

Referida por:

F1875-98R22, F1814-22

Volúmen:

13.01

Número ICS:

11.040.40 (Implants for surgery, prothetics and orthotics)

Palabras clave:

corrosion-surgical implants; cracking-stress-corrosion; loading tests-surgical materials/applications; orthopaedic medical devices-bone plates; orthopaedic medical devices-bone screws; osteosynthesis; seals; stress-metallic materials; testing methods-surgical implants;