Form part (1,1') for an orthopaedic device, in particular an orthopaedic device, having at least one bending range of a plastic material (2,2',16) and areas adjacent to the bending range (2, 2,16) on both sides (3,3,3'''), with the areas (3,3,3) having a wider width than the bending range (2,2,16),marked by it,that the bending range (2, 2,16) is formed by a majority of pre -lines (9), that the pre -lines (9) are formed as indentations in the material; andthat the material of the mould part (1, 1') in the bending area (2, 2', 16) has a curvature, causing the adjacent surface areas (3, 3',(3) at an angle other than 180o.
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