A bioabsorbable material suitable for implanting within a human body, the material including fibers of a composite of a synthetic bioabsorbable polymer such as poly-lactic acid, and a particulate bioactive filler such as calcium phosphate powder. The fibers are discontinuous with non-uniform cross-sections and non-uniform cross-sectional areas. The surface topography provided by the fibers provides a substrate which is more amenable to cellular colonization than prior materials.