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Table 5 Primary outcome parameters: Events

From: Rationale and design of The Delphi Trial – I(RCT)2: international randomized clinical trial of rheumatoid craniocervical treatment, an intervention-prognostic trial comparing 'early' surgery with conservative treatment [ISRCTN65076841]

Event  
1. Neurological disability Worsened MDI > 3 points
Signs of myelopathy (Ranawat IIIA and IIIB)
2. Radiological progression Signs of myelopathy on MRI
Vertical translocation/Impression brainstem AADI > 12 mm
3. Surgery Conservative treatment group
- Intolerable pain
4. Resurgery Surgical group
5. Death All causes