Inclusion Criteria:  Lower back pain (in extension +/- pain in buttocks, groin, thigh) without radicular pain Symptoms > 6 months after failure of conservative management in the primary care setting MRI signs of degenerative disc disease or facet arthropathy One-level positivity on lumbar SPECT/CT  Exclusion Criteria:  Other spinal pathology (tumours, congenital defects, spondylolysis or spondylolisthesis) Intolerance of SPECT examination Pregnancy