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Table 1 :Anatomic factors which determine the wide use of “free-hand” technique for pedicle screw placement in the thoracolumbar and lumbosacral spine as well as possible disadvantages of such technique when dealing with the upper and middle thoracic levels

Table 1 :Anatomic factors which determine the wide use of “free-hand” technique for pedicle screw placement in the thoracolumbar and lumbosacral spine as well as possible disadvantages of such technique when dealing with the upper and middle thoracic levels