Fig. 4From: Creation of a planned or central-clefted puncture combined with a second puncture during vertebroplasty to treat osteoporotic vertebral compression fractures with large cleftsThe methods used to derive measurements from lateral radiographs. KA (kyphotic angle) = the angle between line 1 and line 2. CR (compression ratio) = AVH/PVH. AVH anterior vertebral height, PVH posterior vertebral heightBack to article page