Abstract: The invention relates to a system for the minimally invasive treatment of a bone fracture, especially of a proximal humeral or femoral fracture. The inventive system has an osteosynthesis plate having a supporting section in the cortical substance and an additional fastening section on the bone. A second linking section of the guide element and the shaft of the fixing element are configured as an axially displaceable anti-tilt slide bearing. The system has at least one anti-twist screw in the supporting section for preventing the detached bone fragment from rotation.