The invention relates to a bone screw having a screw shaft (15) comprising a point (13) and concentric to a longitudinal axis (27) of the screw, and that can be anchored in a bone or part of a bone. A screw head (14) is attached to the screw shaft (15). The screw shaft (15) is substantially made of a plastic transparent to X-rays. A part (5, 7, 9, 24) of the screw shaft (15) is made of a different material than that of a core (3, 30) substantially forming the screw shaft (15). The at least one load-bearing area (5, 7, 9, 24) is preferably made of metal or plastic, such as PEEK.