Method of osteosyntheses or arthrodeses of two- bone parts, in particular of the hand and / or foot

A method of securing a first bone part to a second bone part, comprising the steps of:

• obtaining an implant having a first fixation zone and a second fixation zone, each fixation zone made of shape-memory material and including a respective pair of tabs displaceable between an outer position in which they diverge from one another and an inner position in which they are closely spaced, wherein the implant is in the inner position;
• positioning the implant, while in the inner position, such that the pair of tabs of the first fixation zone are within an opening in the first bone part and the pair of tabs of the second fixation zone are within an opening in the second bone part;
• and
• while the first fixation zone is within the first bone part and the second fixation zone is within the second bone part, allowing the pairs of tabs of the respective first and second fixation zones to displace to the outer position through shape-memory action at body temperature.