Variable height vertebral implant

A height-variable vertebral body implant system comprising:

• a first essentially U-shaped or C-shaped cage including vertebral support surfaces;
• wherein the first cage is an inner cage, which is embraced and guided in a telescopic manner by a second outer U-shaped or C-shaped cage including vertebral support surfaces, and wherein legs of the first and the second cage are aligned such that a continuous lateral opening is obtained, and the first and the second cages are configured to be mutually fixed in a predetermined final position,
• wherein at least one of frontal sides of each of the first and second cages include the vertebral support surfaces and webs and tooth-like locking projections extending in a longitudinal direction, and the legs of the first and the second cages each comprise, on leg ends, an inwardly directed stability-increasing curved portion, with the first cage including an elongated hole extending in the longitudinal direction and including a unilateral toothing, and
• an actuating instrument including a hollow cylinder with a first end with toothing configured to mate with the unilateral toothing and a second end with a handle, a guidance rod with a threaded end and configured to fit into the hollow cylinder, a knurled screw configured to act upon the guidance rod through the second end of the hollow cylinder,
• wherein the actuating instrument is configured to move one cage with respect to the other cage.