Method for fusing a human or animal joint as well as fusion device and tool set for carrying out the method

A fusion device for fusing a joint of a human or animal patient, wherein the joint is a synovial joint comprising two articular surfaces between two bones and a gap therebetween, the fusion device comprising:

• at least one anchorage portion and at least one stabilization portion, wherein the anchorage portion and the stabilization portion constitute separate parts
• wherein the fusion device has an overall depth parallel to an implantation direction, the overall depth extending from a proximal face to a distal end of the fusion device, an overall width and a thickness profile perpendicular to the implantation direction,
• wherein the at least one anchorage portion comprises a thermoplastic material that is liquefiable from a solid state to a flowable state upon application of energy, the thermoplastic material being arranged on a surface of the anchorage portion or inside a perforated sheath constituting a part of the anchorage portion, and
• wherein the at least one anchorage portion is configured to be positioned and anchored between the articular surfaces in the joint first, and the stabilization portion is capable of being mounted on the proximal end of the at least one anchorage portion or wherein the stabilization portion is configured to be positioned between the articular surfaces first, and the anchorage portion is capable of being pushed through or past the stabilization portion and anchored in the bone tissue beside the stabilization portion or beyond the stabilization portion or both, beside and beyond the stabilization portion.