Table 1.

Patient demographic data and hardware

Patient and hardware	Number
Number of patients	87
Gender	55 male, 32 female
Average age	58.6 years (range, 10–89)
Average number of levels of instrumentation	5 (range, 2–7)
Total number of screws placed	713
Lateral mass	597 (81.3%)
Pedicle	96 (13.1%)
C2 pars	20 (2.7%)
Lateral mass screws/pedicle screws
C3	116 (16.7%)
C4	139 (20.1%)
C5	160 (23%)
C6	140 (20.2%)
C7	42 (6.1%)
T1	96 (13.9%)
Average screw length
Lateral mass	11.2 mm
Pedicle	22.4 mm