Table 2.
Chronological changes in JOA scores after surgery
| JOA score | ||||
|---|---|---|---|---|
| CSM | P* | OPLL | P* | |
| Preoperative | 11.0 ± 2.6 | 11.0 ± 2.5 | ||
| 3 months after surgery | 13.1 ± 1.8 | 0.0003 | 13.1 ± 1.7 | 0.0012 |
| 1 year after surgery | 13.6 ± 2.1 | <0.0001 | 13.8 ± 2.2 | 0.0002 |
| 3 years after surgery | 13.6 ± 2.2 | <0.0001 | 13.7 ± 2.0 | 0.0001 |
| More than 10 years after surgery | 13.1 ± 2.4 | 0.0008 | 13.0 ± 2.7 | 0.008 |
Values are mean ± SD
JOA Japanese Orthopaedic Association, CSM cervical spondylotic myelopathy, OPLL ossification of the posterior longitudinal ligament
* P by Mann–Whitney U test