Implant compositions are disclosed consisting of a biocompatible carrier
medium such as a saline or dextran solution and particles of collagenous
material dispersed therein. The collagenous material is derived from
tissue which has been milled to provide fragments of collagen fibres
which preserve the architecture of the original fibres and their
molecular structure. The collagenous material is also substantially free
of non-fibrous tissue proteins, glycoproteins, cellular elements and
lipids or lipid residues, and is non-cytotoxic. By suitable choice of
particle size and concentration, the composition may be presented in
injectable form or as a paste. The compositions are suitable for
application in cosmetic and reconstruction surgery.