Table 3.
Location and extent of medio-caudal pedicle wall (mcpw) perforations
| Total | Grade A (no perforation) | Grade B (perforation <2 mm) | Grade C (perforation 2–4 mm) | Grade D (perforation >4 mm) | |
|---|---|---|---|---|---|
| Th4 | 2 | 2 | |||
| Th5 | 4 | 2 | 2 | ||
| Th6 | 6 | 6 | |||
| Th7 | 6 | 6 | |||
| Th8 | 4 | 4 | |||
| Th9 | 4 | 4 | |||
| Th10 | 8 | 8 | |||
| Th11 | 16 | 14 | 1 | 1 | |
| Th12 | 30 | 28 | 1 | 1 | |
| L1 | 18 | 18 | |||
| L2 | 36 | 32 | 3 | 1 | |
| L3 | 51 | 47 | 3 | 1 | |
| L4 | 73 | 68 | 5 | 3 | |
| L5 | 58 | 51 | 3 | 2 | 2 |
| S1 | 10 | 9 | 1 | ||
| 326 | 296 (90.8%) | 19 (5.83%) | 6 (1.84%) | 5 (1.53%) | |
| mcpw perforation rate | (Grade B+C+D) | 30/326 (9.2%) | |||
| Misplacementa rate | (Grade C+D) | 11/326 (3.37%) |
a
Misplacement (= medio-caudal pedicle wall [mcpw] perforation >2 mm), as defined by the majority of the current literature.