Radiographic/Diagnostic Imaging Interpretation and Technique
Use a checklist every time
ABCDS: Alignment, Bone, Cartilage/joints, Soft tissue, and everything else. For alignment in the cervical spine, trace the four lines - anterior vertebral, posterior vertebral, spinolaminar, and posterior spinous. Under bone, assess cortical integrity, trabecular pattern, density, and fracture. Under cartilage, assess disc height, facet joints, and sacroiliac joints. Under soft tissue, look for prevertebral swelling, gas, and calcification.
Know each view's purpose: AP for lateral alignment and asymmetry, lateral for sagittal contour and listhesis, obliques for cervical foramina, flexion-extension for stability. Image quality is part of the answer - a film that does not demonstrate the area of interest is a repeat study, not a negative one. Understand indications for advanced imaging: MRI for suspected disc herniation with radiculopathy, cord compression, infection, or tumor; CT for bony detail and trauma; bone scan for occult fracture or metastasis. Respect ALARA and know MRI contraindications such as pacemakers and metallic foreign bodies.
Traps
Over-reading normal variants (cervical ribs, overlapping shadows) as pathology; calling a study normal when soft tissue is not visualized; expecting radiographs to identify a pain generator - films show structure, not pain.
Worked example
A lateral film showing 4 mm anterior translation of C4 on C5 with intact posterior elements suggests degenerative listhesis; flexion-extension views assess stability before any manipulation.
Rule of thumb
Measure and compare. Prevertebral soft tissue is narrow at C2 and widens below C4; a value outside the expected range needs explanation.