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Biomechanics of the SB Charité lumbar intervertebral disc endoprosthesis

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Summary

The SB Charité intervertebral disc prostheses consist of two metal end-plates and an interposed polyethylene slide core. These were subjected to static and dynamic testing in a servohydraulic test rig. When embedded in polypropylene, the prostheses were found to function adequately under a high static load, and under a lighter dynamic load for a long time. When tested in a cadaveric vertebral segment, a large end-plate surface area proved to be of critical importance in preventing collapse of the prosthesis into the vertebral body.

Résumé

La prothèse des disques intervertébraux de type “SB Charité” est composée de deux plaques métalliques entre lesquelles est interposé un noyau élastique de polyéthylène. Elle a été soumise à des épreuves biomécaniques comportant des expériences statiques et dynamiques de compression. Les tests faits sur des prothèses encastrées dans du polypropylène ont démontré une fonction satisfaisante après des charges statiques élevées et après des épreuves dynamiques de longue durée. L'examen de prothèses implantées sur des rachis de cadavres a montré l'importance d'une surface étendue des plaques métalliques afin d'éviter leur encastrement à l'intérieur des corps vertébraux.

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Büttner-Janz, K., Schellnack, K. & Zippel, H. Biomechanics of the SB Charité lumbar intervertebral disc endoprosthesis. International Orthopaedics 13, 173–176 (1989). https://doi.org/10.1007/BF00268042

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