The oblique view of the lumbar spine is an X-ray taken with the patient rotated about 45° to profile the vertebrae. It best visualizes the zygapophyseal (facet) joints and pars interarticularis — useful for detecting spondylolysis, facet arthropathy, and certain fractures. The projection produces the "Scottie dog" silhouette, allowing assessment of alignment and bony defects not seen on AP or lateral views.

An oblique view X‑ray is a radiographic projection taken with the body or film rotated between the frontal (AP) and side (lateral) positions to image structures that overlap on standard views. It improves visualization of bones, joints, spine, ribs and facial bones, helping detect fractures, dislocations, or spinal foraminal narrowing. The angle varies (often about 45°) depending on the area examined.

The four standard lumbar spine radiographic views are: anteroposterior (AP), lateral, and two oblique views (left and right). AP shows vertebral alignment and disc spaces; lateral visualizes vertebral bodies, discs, and the spinal canal; obliques assess facet joints and pars interarticularis. Together they evaluate alignment, fractures, degenerative change, and spondylolysis. They’re used for initial assessment of back pain.

Oblique spine radiographs visualize facet joints, pars interarticularis and intervertebral foramina that are poorly seen on AP and lateral views. They improve detection of pars defects (spondylolysis), subtle fractures, facet arthropathy and foraminal narrowing causing nerve-root impingement. Obliques provide complementary alignment and bony detail, helping guide diagnosis, management and decisions about further imaging.

An oblique view is an imaging projection taken at an angle between a frontal (AP/PA) and lateral plane. The patient or X‑ray beam is rotated to visualize structures that overlap on standard views, improving detection of fractures, joint-space abnormalities, facet joints, or lesions. Oblique projections are commonly used for spine, chest, and extremity radiographs to clarify anatomy and aid diagnosis.

An oblique ray is a light ray that strikes a surface or optical axis at any angle other than perpendicular (not normal). In optics, oblique incidence leads to reflection and refraction governed by Snell’s law, producing angled transmitted and reflected paths. Oblique rays are important in imaging, lens design, and understanding effects such as refraction, dispersion, and angular aberrations.