A lumbar spine x-ray with flexion and extension views is a series of plain radiographs taken while the lower back is bent forward and backward to evaluate dynamic alignment and stability. It helps detect abnormal vertebral motion, spondylolisthesis, or ligament injury that may not appear on static images. The test is quick, low‑radiation, and used when instability is suspected or to guide treatment planning.

An X‑ray of the lumbosacral (LS) spine lateral flexion is a pair of side‑bending radiographs taken while the patient bends sideways. These dynamic views assess spinal alignment, vertebral translation, and segmental instability (for example, spondylolisthesis), and help evaluate range of motion or postoperative stability. It’s quick, low‑radiation, and complements neutral and extension views for diagnosis.

The four standard lumbar spine radiographic views are: anteroposterior (AP), lateral, right oblique and left oblique. AP shows vertebral bodies, alignment and pelvic landmarks; lateral demonstrates disc spaces, vertebral height and sagittal alignment; oblique views visualize facet joints and the pars interarticularis to detect spondylolysis. These views together assess bony anatomy and alignment.

Lateral lumbosacral x‑ray: patient positioned laterally (lying on side or standing lateral) with the side of interest against the image receptor. Flex hips and knees for comfort and stability, elevate/extend arms forward or above head to clear the field. Stack shoulders and pelvis so the midsagittal plane is parallel to the receptor. Center the beam on the lumbosacral region and include L1–sacrum.

A flexion and extension X‑ray uses side-view images taken while the neck or spine is bent forward and backward to assess dynamic alignment and range of motion. It reveals abnormal vertebral translation or angulation, spinal instability, ligamentous injury, post‑operative fusion integrity, and spondylolisthesis that may not appear on static images. It helps guide diagnosis and management of trauma, degenerative disease, or persistent pain.

The lateral flexion of the lumbar spine is side-bending of the lower back in the coronal plane, bringing the rib cage toward the pelvis on the same side and widening the opposite side. It is produced by the quadratus lumborum, obliques and erector spinae. Typical active range is about 15–20 degrees each side; excessive or limited motion may indicate dysfunction.