Free-hand technique of C7 pedicle screw insertion using a simply defined entry point without fluoroscopic guidance for cervical spondylotic myelopathy patients with C3 to C6 instrumented by lateral mass screws: a retrospective cohort study

Table 3 The medial angulation at C3-7 levels

	Medial angulation (Transverse angle)
Pedicle	Left	Right
C3	45.8 ± 4.3°	45.0 ± 5.2°
C4	45.2 ± 4.6°	45.6 ± 3.9°
C5	43.4 ± 4.7°	42.9 ± 4.2°
C6	39.2 ± 5.2°	38.9 ± 3.5°
C7	33.6 ± 5.5°	32.0 ± 4.6°

ISSN: 1471-2482