examples of non biodegradable materials include metals such as stainless steel titanium nitinol cobalt alloys thereof and equivalents thereof and polymeric materials such as non biodegradable polyesters polyamides polyolefins polyurethanes and polyacetals and equivalents thereof all the design elements of the threaded fastener 100 and barbed fastener 120 are interchangeable hence either of the fasteners 70 and 80 can comprise of any combination of the design elements described for the threaded fastener 100 and the barbed fastener 120 by way of one example the first fastener 70 can be made from a bioabsorbable copolymer of lactide and glycolide and structurally comprise an external male drive feature 122 a run out shaft 105 a multiple lead non continuous helically threaded engager 75 with a cutting flute tip 106 and a continuous canulation 128 likewise the second fastener 80 can be made from a different combination of the features used to describe the threaded fastener 100 and the barbed fastener 120 although the examples of barbed connected truncated conical sections 123 and helical thread forms 103 are shown by example to represent the bone engager 75 it is understood that other means of engaging bone can be used for the engager 75 these means include nails radially expanding anchors pressfits tapers hooks surfaces textured for biological ingrowth adhesives glues cements hydroxyapatite coated engagers calcium phosphate coated engagers and engagers with tissue engineered biological interfaces such means are known in the art and can be used as alternative bone engagement means for.