Please select the eligibility criteria that correspond to the clinical trial below.
Title: Efficacy of the Mckenzie Method in Patients With Chronic Non-Specific Low Back Pain: A Randomized Placebo-Controlled Trial
Brief Summary: The purpose of this study is to assess the efficacy of the McKenzie method in patients with chronic non-specific low back.


Options:
A: Inclusion Criteria:

* Aged between 18 and 75
* Chronic low back pain greater than 6 months duration
* Score greater than 14% for disability on Oswestry Disability Index (ODI)
* Independently mobile (with or without aids), to be capable of participating in a rehabilitation programme

Exclusion Criteria:

* Primary pain area is not the lumbar spine (from T12-buttocks)
* Leg pain as the primary problem (nerve root compression or disc prolapse with true radicular pain/radiculopathy, lateral recess/central or spinal stenosis with primary leg pain)
* \<6 months post lumbar spine or lower limb or abdominal surgery
* Pain relieving procedures such as injection based therapy (e.g epidurals) and day case procedures (e.g rhizotomy) in the last 3 months
* Pregnancy
* Rheumatologic/inflammatory disease (e.g. rheumatoid arthritis (RA), ankylosing spondylitis (AS), psoriatic arthritis, lupus, scheuermann's disease)
* Progressive neurological disease (e.g. multiple sclerosis (MS), parkinson's disease (PD), motor neuron disease (MND)
* Unstable cardiac conditions
* Red flag disorders like malignancy/cancer, acute traumas like fracture (\<6 months ago) or infection, spinal cord compression/cauda equina
B: Inclusion Criteria: patients seeking care for chronic non-specific low back pain (defined as pain or discomfort between the costal margins and the inferior gluteal folds, with or without referred symptoms in the lower limbs, for at least 3 months), with a pain intensity of at least 3 points measured by a 0-10 points pain numerical rating scale, aged between 18 and 80 years and able to read in Portuguese.

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Exclusion Criteria: patients will be excluded if they have any contraindication to physical exercise or ultrasound or short wave therapy, evidence of nerve root compromise (i.e one or more of motor, reflex or sensation deficit), serious spinal pathology (such as fracture, tumor, inflammatory and infectious diseases), serious cardiovascular and metabolic diseases, previous back surgery and pregnancy.

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C: Inclusion Criteria:

* Finished treatment at secondary sector specialist spinal unit
* Able to understand and read Danish

Exclusion Criteria:

* Co-morbidity preventing patient from completing Nordic walking program
* Pain \<3 on 11 point box scale
* Unable to perform Watt Max Cykel Test
D: Inclusion Criteria:

Primary inclusion criteria for receiving MRI

* The patient must have LBP with a current duration of 3 - 12 month.
* The patient must have an actual pain intensity ≥4 on numerical pain rating scale from 0-10.

Secondary inclusion criteria for receiving MRI

* The patient must speak and understand Danish.
* The patient must be between 18-60 years of age.
* The patient must be willing to participate in the project. Inclusions criterium for the project
* There must be an MRI showing MC in the lumbar spine.

Exclusion Criteria:

* The patient is unable to go through with the project because of other physical or mental disorder.
* The patient is pregnant.
* The patient is referred to operation.

Answer: B