Abstract: A sinus-canalis internal-fixation device is configured in a shape modeled after the anatomical form and dimensions of a sinus tarsi of an ankle-bone structure of a patient, which anatomically twists and curves and is surrounded by the anatomically irregular surfaces of the talus (ankle bone) and calcaneus (heel bone). The surfaces of the sinus-canalis internal-fixation device mirror the anatomically irregular surfaces of the talus (ankle bone) and calcaneus (heel bone) surrounding the sinus-canalis internal-fixation device. The sinus-canalis internal-fixation device comprises an anatomical shaft and anatomical superior, inferior, and posterior pegs connected to the top, bottom, and back end of the anatomical shaft, respectively. Further, if desired, the sinus-canalis internal-fixation device can be cannulated and/or comprise at least one groove, recess, opening, ridge, and/or hill integrated thereinto.