This group of inventions relates to the field of medicine, and more particularly to traumatology and orthopaedics, and can be used for treating patients with damaged or diseased limb bones. The present compression-distraction apparatus comprises: supports in the form of rings provided with apertures and interconnected by threaded rods； bone anchors； and also fastening members, wherein at least one of the supports is comprised of coaxial inner and outer parts mounted so as to be capable of rotating relative to each other, the coaxial outer part of the support in question having, on its outer face, lugs with openings and being formed from rigidly interconnected curved segments. The curved segments of the coaxial outer part of the support have toothed rings on the inner face, and the coaxial inner part of the support has a groove on its outer face, in which the toothed rings of the curved segments of the coaxial outer part of the support are mounted； the coaxial inner part of the support is provided with apertures, at least one of which communicates with the aforementioned groove of the coaxial inner part of the support and in which a key with a toothed ring is mounted so as to be capable of interacting with the toothed ring of a curved segment of the coaxial outer part of the support. Also envisaged are novel embodiments of repositioning assemblies. The inventions provide a simplified design for a compression-distraction apparatus and repositioning assemblies, greater ease of installation and increased repositioning efficiency and fixation stability.L'invention se rapporte au domaine de la médecine, notamment de la traumatologie et de l'orthopédie, et peut être utilisée afin de traiter des patients souffrant de blessures et d'affections des os des extrémités supérieures. L'appareil de compression-distraction comprend des supports en forme d'anneaux comportant des ouvertures et connectés par des tiges filetées, des fixateurs d'os ainsi que des éléments de connexion. Au
