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Table 2 Follow-up chart

From: The SNAP trial: a double blind multi-center randomized controlled trial of a silicon nitride versus a PEEK cage in transforaminal lumbar interbody fusion in patients with symptomatic degenerative lumbar disc disorders: study protocol

  Intake Admission 3 months 6 months 12 months 24 months
Visit 1 2 3 4 5 6
Demography X      
Study information + informed consent X      
Randomization X      
Surgery   X     
Operative data   X     
Neurological examination X   X X X X
Questionairres: X   X X X X
 - Roland Morris disability questionairre
 - SF-36
 - VAS back
 - VAS leg
 - Working status
Likert scale   X X X X X
X-rays X X X X X X
CT      X  
MRI X      
Complications   X X X X X