Table 4.
JOA score RR after FMD and ESCP, and their outcomes.
| Improved | JOA Score RR (%) | Re-Syringomyelia | Stabilized | Deteriorated | Transient Morbidities | |
|---|---|---|---|---|---|---|
| Neurological Symptoms/Signs | (Mean with ± SD) | Neurological Symptoms/Signs | Neurological Symptoms/Signs | |||
| Total Number: 300 surgeries | 248/300 (82.7%) | 58.5 ± 10.4 | 24/300 (8.0%) | 25/300 (8.3%) | 28/300 (9.3%) | 9/300 (3.0%) |
| (Posterior fossa decompression) | ||||||
| 12 years or older (≥12) | ||||||
| FMD: 133 cases | 115/133 (86.5%) | 58.7 ± 10.2 | 10/133 (7.5%) * | 10/133 (7.5%) | 8/130 (6.2%) * | 3/133 (1.7%) |
| (for CM-I types A, B and CM-borderline) | ||||||
| ESCP: 87 cases | 78/87 (89.7%) | 60.2 ± 10.1 | 1/87 (1.1%) ** | 8/87 (9.2%) | 2/87 (2.3%) ** | 4/87 (4.6%) * |
| (for CM-I type C) | ||||||
| Younger than 12 years (<12) | ||||||
| FMD for all types: 80 | ||||||
| CM-I type A: 12 | 7/12 (58.3%) ** | 57.2 ± 9.1 | 6/12 (50.0%) * | 0/12 (0%) | 5/12 (41.7%) * | 1/12 (8.3%) |
| CM-I type B: 33 | 25/33 (75.8%) | 58.2 ± 10.1 | 2/33 (6.1%) | 5/33 (15.1%) | 3/41 (7.3%) | 0/33 (0%) |
| CM-I type C: 28 | 18/28 (64.3%) ** | 48.6 ± 10.2 ** | 5/28 (17.9%) * | 1/28 (3.6%) | 9 /28 (32.1%) * | 1/28 (3.6%) |
| CM-borderline: 7 | 5/7 (71.4%) | 54.3 ± 10.4 | 0/7 (0%) | 1/7 (14.3%) | 1/7 (14.3%) | 0 /7 (0%) |
*: significantly higher or more than other groups (p < 0.01). **: significantly lower or less than other groups (p < 0.01). Abbreviations: JOA score RR = the recovery rate of Japanese Orthopaedic Association Cervical Myelopathy Evaluation Questionnaire (JOACMEQ), Re-syringomyelia = syringomyelia persistent, SD = standard deviation, FMD = foramen magnum decompression, CM-I = Chiari malformation type I, CM-borderline = Chiari malformation borderline, ESCP = expansive suboccipital cranioplasty.