The purpose of the present invention is to reliably prevent a back out phenomenon, and alleviate the burden on the patient by reducing the size of a surgical wound. In the present invention, a steel wire (Kirschner steel wire (20)) pierces the site to be treated (patella (40)) so as to span the bone fracture site (cracked part (40c)) and steel wire holding assemblies (staplers (10)) for holding the ends (one end (20a), other end (20b)) of the steel wire (Kirschner steel wire (20))are fixed to points sandwiching the bone fracture site (cracked part (40c)) of the site to be treated (patella (40)) while the ends (one end (20a), other end (20b)) of the steel wire (Kirschner steel wire (20)) are fixed at the steel wire holding assemblies (stapler (10)) by steal wire fixation assemblies (screw sets (30)).
