This study evaluates the predictor value of manual test in lumbar chronic patients blocks. Bibliography has show limited evidence of clinical predictors in lumbar blocks. Prior to lumbar facet block or medial branch denervation patient will be evaluated with manual provocative segmental movements, lumbar sagittal range of motion, manual segmental movement and slump neural test . Immediate, one and six months effect will be registered.

Clinical tests have sown limit evidence to predict efficacy of lumbar facet blocks. Segmental mobility tests have been included into the protocol to evaluate the efficacy of the lumbar blocks.

Chronic low back pain patients will be tested to evaluate the predictor value of manual clinical tests.

Patients from the "Lozano Blesa" Hospital pain clinic will be evaluate before, one month and six months after the lumbar facet block.

Inclusion Criteria:

• more than 3 months of low back pain.
• lumbar with or without leg pain.
• patient treated with a lumbar facet block or medial nerve denervation.
• capable to be physically explored.
• capable to fill a questionaire.

Exclusion Criteria:

• no mechanical pain.
• severe medical condition.
• severe lumbar trauma.
• severe lumbar instability.
• severe lumbar deformity
• psychiatric disorder.

Chronic lumbar pain patients from the pain clinic service of the Lozano Blesa University Hospital

Yes to the pain clinic service