pins into the mandrel core of the mold cavity and winding fibers at a lower ply angle e g about 30 degrees such that the fibers are aligned more closely with the axis of the mandrel and are woven between the pins the pins serve both to prevent the fibers from shifting during injection molding and to provide perforations in the device needed for autologous bone graft placed by the surgeon in the u201c cage u201d to grow out into the surrounding space alternatively a loosely woven fabric of the biocomponent fibers can be wrapped many times around the mandrel with protruding removable pins such that the fibers separate enough to allow the pins to pass through the fabric in this way most of the fibers can be aligned completely parallel with the axis of the mandrel which is the direction in greatest need of reinforcement if the device is implanted parallel to the spinal column upon clamping the mold and injecting it with the appropriate bioabsorbable polymer molding resin cooling parting the mold extracting the pins and retracting the mandrel core the finished part will be a solid fiber reinforced tube with perforations in the wall corresponding to the number and size of the pins the external surface of the device can be provided with any desired texture or added features such as threads for implant stabilization by proper design of the mold cavity the molding resin optionally can be modified by the addition of other additives such as finely divided mineral such as hydroxyapatite to improve the hardness of the molding resin this could be especially useful in the case of.