Magnesium as material for resorbable implant systems

Magnesium as material for resorbable implant systems

Kategorien Konferenz (reviewed)
Jahr 2012
Autoren Denkena, B., Köhler, J., Helmecke, P., Angrisani, J., Reifenrath, C., Rössing, C.:
Veröffentlicht in Proceedings of the 9th International Conference on Magnesium Alloys and their Applications, July 8-12 (2012), Vancouver, BC, S. 1281-1287.

Magnesium alloys are promising candidates for bioresorbable implants in osteotomy due to their biocompatibility with the human organism and their comparably high corrosion rate. For resorbable implants the increasing stability loss of the implant due to its degradation is intended to match the increasing stability of the bone. The degradation behavior can be attuned by the choice of the manufacturing process. Turning and deep rolling are compared concerning their influence on the degradation behavior of the magnesium alloy WE43. X-ray measurements show high compressive residual stress in the subsurface of the specimens. The corrosion rate is strongly decreased for the deep rolled specimen. In addition the biocompatibility of magnesium is validated using an implant system containing an intramedullary nail and four interlocking screws made out of the alloy LAE442. The system is implanted into the right tibia of a German Black-Headed Mutton sheep. Radiographs document the post-operative response of the organism. Both bone reaction and gas accumulation are visible. Clinical examinations show a good tolerance of the implant.