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overview of investigations at each clinical contact
| Preoperative | Postoperative (po) | 6 weeks po | 3 months po | 1 year po | |
| MRI | X | ||||
| Plain cervical radiograph | X | X | X | X | X |
| mJOA | X | X | X | X | |
| SF-36 | X | X | X | X | |
| Neurologic examination by independent neurologist | X | X | X |
