Table 2 Details of the operations

Number of operated foramen

1

29

2

13

Level of the operated foramen

C4/5

2

C5/6

30

C6/7

19

C7/T1

4

Operated side of foramen (cases)

Right / Left

24 / 31 (18 / 24)

Operation time (min.)

72.7 ± 32.5

Operation time for one level (min.)

57.7 ± 27.1

 Temporary muscle weakness

3 (7.0)

 Dural tear

0 (0.0)

 Nerve root injury

0 (0.0)

Re-operation

0 (0.0)