Compression-distraction apparatus for osteosynthesis

A compression-distraction apparatus for osteosynthesis, comprising at least two support units (1), each incorporating at least two fixing pins (3), one of whose arms (3a) crossing over in the bone, while other arms (3b) are secured in pin holders (2) made as a bolt (4) carrying a set of plates (8) having open slots (10) to accept the fixing pins (3), and a stack of spacer shims (9), the pin holders being fitted on a main threaded rod (6) traversably lengthwise the axis thereof and fixable with the aid of nuts (7), characterized in that the bolt (4) of the pin holder (2) has an axial hole (5) through which the main threaded rod (6) is free to pass, the plates (8) and spacer shims (9) are shaped as washers mounted on the bolt (4) rotatably about its axis and fixable by a clamping nut (13), the open slots (10) to receive the fixing pins (3) are provided on end surfaces of the plates (8) and pass along the chord of their circumference on a far side of the hole (12) in the washer, while the nuts (7) fitted on the main threaded rod (6) are situated on both sides of the bolt ends, and the fixing pins (3) are curved and locked in the pin holder (2) in a criss-cross fashion.