Pedicle Screw for Fractures / Spondylolisthesis
The quattroaxial screw is a uniplanar screw with an additional degree of freedom in the other planes that facilitates the rod insertion and minimizes undesired tension. It has the mobility of a polyaxial screw in medial-lateral direction and of a monoaxial screw in cranio-caudal direction. In combination with the polyaxial screws it is offering the surgeon especially for fracture treatments the possibility of direct reposition with a minimum of anterior height loss compared with a monoaxial screw. The patented screw design is the next generation of pre-fixation screws. Hereby, in relation to polyaxial screws, a 2-3 times higher angular stability is obtained as well as a sliding of screw head is avoided. The screw head position will be finally fixed with the rod.