Figure 1From: Pullout strength of pedicle screws with cement augmentation in severe osteoporosis: A comparative study between cannulated screws with cement injection and solid screws with cement pre-filling A photo and diagram of the cannulated screws. (A) Conical and (B) cylindrical screws. The outer geometry of the solid screws is identical to that of the cannulated screws but without the internal cavity. (Dimension: mm).Back to article page