Lumbosacral spine MRI is a noninvasive imaging test using magnetic fields and radio waves to produce detailed images of the lower back — lumbar vertebrae, sacrum, intervertebral discs, spinal canal and nerve roots. It helps diagnose causes of back pain and sciatica such as disc herniation, spinal stenosis, infection, tumor or trauma. No ionizing radiation; contrast may be used and some metal implants are contraindications.

Costs vary by country and facility. In India a lumbosacral MRI typically costs about ₹2,500–₹8,000. In the UK it’s free on the public system for eligible patients; private scans run roughly £250–£700. In the US self-pay prices commonly range $400–$3,000 (higher in hospitals); contrast studies or advanced imaging add extra. Final price depends on location, facility and insurance coverage.

A lumbosacral spine MRI typically requires about 20–40 minutes of actual imaging. If contrast (gadolinium) or extra sequences are needed, the scan can take 45–60 minutes. Allow additional time (about 15–30 minutes) for registration, positioning and any post‑scan checks, so the total appointment often lasts roughly 45–90 minutes.

Sciatic nerve imaging (usually a lumbar/sacral MRI) costs vary widely by country and facility: in the US an uninsured MRI often runs about $400–$3,000 (commonly $1,000–$2,500); private UK scans typically cost £200–£700 while NHS scans are free; in India prices often range ₹2,000–₹10,000. Costs depend on contrast use, imaging center, and insurance—confirm local quotes.

A doctor orders a lumbar spine MRI to evaluate persistent or severe low back pain, sciatica or leg weakness, numbness, or bowel/bladder dysfunction; to look for herniated discs, spinal stenosis, nerve root compression, infection, tumors, or inflammatory disease; after trauma or when conservative treatment fails; and for surgical planning or to monitor known spinal disease. MRI best shows soft tissues and nerves.

Yes—lumbar MRI can detect structural causes of nerve injury, such as disc herniation, spinal stenosis, foraminal narrowing, nerve-root compression, inflammatory changes, or tumor; it may also show indirect signs of nerve/root injury (edema or muscle denervation). However, MRI shows anatomy, not nerve function; some types of nerve damage (small‑fiber or functional impairment) require EMG/NCS or clinical correlation.