Abstract
Bioabsorbable fibres showing stress at break of 500 MPa and modulus of 10 GPa, have been obtained through a melt-spinning, hot-drawing process. Multifilament braids present the characteristic S-shaped stress-strain curve of human ligaments. Mechanical behaviour is affected by twisting and braiding such that stiffness can vary from 0.8 GPa to 6.2 GPa, covering the whole ligament physiologic range, reported to be ≃1.5 GPa, according to age and sport activity. A cyclic tension load applied for 2×106 cycles lead to initial mechanical improvement and causes no creep. During degradation in vitro, yield stress increases continuously while the ultimate tensile strength (UTS) starts to decrease after 5 weeks. After 13 weeks degradation, strength loss amounts to 6% of the initial UTS. At this time the surface of the fibres shows isolated longitudinal cracks.
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This paper was accepted for publication after the 1995 Conference of the European Society of Biomaterials, Oporto, Portugal, 10–13 September
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Incardona, S.D., Fambri, L. & Migliaresi, C. Poly-L-lactic acid braided fibres produced by melt spinning: characterization and in vitro degradation. J Mater Sci: Mater Med 7, 387–391 (1996). https://doi.org/10.1007/BF00122005
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DOI: https://doi.org/10.1007/BF00122005