Answer:
Plain film X-ray cannot tell much about the diagnosis of pain but is helpful in indicating a vertebral fracture, a swelling in the lumbar region, spinal stenosis, disc replacement.
Step-by-step explanation
If the straight leg test is negative, it shows that the lower back pain is localized and non-radiating. A positive X-ray of the lower back i.e. the lumbosacral spine region is indicative of spinal stenosis, lumbar strain, sciatica etc. Any localized injury due to strain may cause low back pain.