Maas 2012.

Trial name or title	Minimal interventional procedures for chronic mechanical low back pain patients
Methods	Three randomised, controlled trials with an economic evaluation
Participants	Inclusion criteria Chronic mechanical low back pain 18 to 70 years of age No improvement in conservative treatment No severe psychiatric or psychological problems No pregnancy No disturbed coagulation Positive diagnostic block (> 50% pain reduction or positive discography)
Interventions	Experimental group: RF therapy and 3‐month physiotherapy programme Control group: 3‐month physiotherapy programme
Outcomes	Pain intensity, global perceived effect, functional status, general health, participant satisfaction, pain experience, costs
Starting date	Start inclusion January 2013
Contact information	Dutch Trial Register number: NTR3531
Notes