The invention relates to a fixation nail for temporarily securing transplantable tissue, bone parts, and bone replacement substances using a cover or for securing natural or artificial bone replacement parts to bones. The fixation nail has a round flat nail head with a diameter of 0.50 to 6.0 mm, and the thickness of the nail head is 0.10 to 2.0 mm. The fixation nail has a nail pin which is formed with a sharp tip, and the pin has a length between 0.5 times to 2 times the diameter of the nail head and a thickness between 0.15 times to 0.5 times the diameter of the nail head. The fixation nail consists of a biocompatible, biocorrodable magnesium alloy which is composed of at least 90 wt. % metal magnesium and contains less than 0.1 wt. % aluminum, less than 0.1 wt. % copper, less than 0.1 wt. % iron, and less than 0.1 wt. % nickel as physiologically undesirable impurities.
