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Pedicle screw placement and measurements. (a) The isthmus, posterior plane and posterolateral plane of the isthmus; (b) The entry point; (c and d) Pedicle screw placement; (e) PH (pedicle height); (f) PW (pedicle width); (g) The length of screw channel (LSC); (h) E angle (transverse angle); (i) F angle (vertical angle)
