Abstract: Method and device to be used in osteotomy in securing two separated parts of a bone in relation to each other before and after removing an excessive part thereof. After removing and/or holding/keeping apart tissue like muscles, tendons, skin and so on, a longitudinally shaped fixation device is applied atop of a site of said bone (B) where the excision is to be performed. The device is secured with the use of one or more nails or screws at one first end thereof with the use of a hole or holes providing a snug fit to the bone as well as the device. The fixation device is secured at its other second end with the use of one or more elongated holes or slots in the longitudinal direction of the fixation device, which holes once the bone portion to be excised is taken away, provide for movability of the bone ends thus created towards each other.