A method of forming a plurality of polymeric components comprises the steps of: providing an array of preforms (10) each preform (10) comprising crosslinked polymeric material providing non crosslinked polymeric material (28) around at least a portion of each preform (10) fusing the array of preforms (10) to the non crosslinked polymeric material (28) so as to form a plurality of hybrid components removing a portion of each preform (10) so as to deposit a crosslinked surface layer on the non crosslinked polymeric material (28) and fashioning the hybrid components into the plurality of polymeric components. The polymeric components may constitute the whole or a part of a prosthesis such as an acetabular cup prosthesis for use in hip resurfacing.
