this invention relates to bioabsorbable fibers , comprising a semicrystalline fiber - forming core polymer and an amorphous sheath polymer , wherein the core polymer and sheath polymer are separately melt extruded and connected to one another through an adhesive bond . the present invention also relates to reinforced composites of the bioabsorbable fibers , and to devices comprising the reinforced composites . the devices are suitable for in vivo implantation . some embodiments of the present devices can also support high loads , making then useful for fracture fixation and spinal fusion . the invention also relates to methods of making the various materials of the invention .