Table 3.
Number of medially, laterally, and anteriorly displaced screws according to disease
| Disease | Medial displacement | Lateral displacement | Anterior displacement | Inserted | Displaced | Safe zone | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| < 2 mm | 2–4 mm | 4–6 mm | > 6 mm | < 2 mm | 2–4 mm | 4–6 mm | > 6 mm | < 2 mm | 2–4 mm | 4–6 mm | > 6 mm | ||||
| AIS (n = 5) | 9 | 4 | 1 | 0 | 10 | 10 | 9 | 0 | 3 | 2 | 1 | 0 | 101 | 43 | 29 |
| CP (n = 7) | 13 | 6 | 1 | 0 | 9 | 6 | 3 | 0 | 4 | 2 | 0 | 0 | 120 | 38 | 28 |
| DMD (n = 6) | 9 | 2 | 0 | 0 | 14 | 9 | 3 | 0 | 5 | 1 | 0 | 0 | 124 | 37 | 32 |
| SMA (n = 5) | 6 | 4 | 1 | 0 | 7 | 10 | 4 | 0 | 1 | 1 | 2 | 0 | 92 | 32 | 23 |
| Polio (n = 3) | 4 | 4 | 0 | 0 | 2 | 5 | 3 | 0 | 4 | 1 | 0 | 0 | 45 | 18 | 11 |
AIS = adolescent idiopathic scoliosis; CP = cerebral palsy; DMD = Duchenne muscular dystrophy; SMA = spinal muscular atrophy; polio = poliomyelitis.