Bone screw

The present disclosure generally pertains to methods and systems for fusing a joint. The disclosure includes mechanically immobilizing the joint by insertion of a bone screw, the bone screw including a screw shaft operatively coupled to a screw head, the screw shaft including a longitudinal axis, a channel extending along the longitudinal axis, a first shaft wall section, a second shaft wall section and a third shaft wall section. Fusing of the joint includes inserting the screw into a first bone, a second bone and a joint formed between the first bone and the second bone. Insertion further includes cutting bone pieces away from the first bone using the third shaft wall section of the bone screw and directing the first bone pieces into a helical depression formed in the third shaft wall section.