Uncovertebral degeneration

Uncovertebral joints aka Luschka joints
From C2-3 to C6-7
C3 to C7 vertebral bodies have on the lateral aspect superior projections called uncinate processes that articulate with the next higher vertebra
Evolves with age
Joint permits flexion and extension, restricts lateral motion. Also prevents lateral/foraminal disc protrusions
Osteophytes can form on uncinate process with age due to uncovertebral arthrosis
Uncovertebral arthrosis causes both intervertebral and transverse foraminal narrowing
Foraminal narrowing in cervical spine is caused by uncovertebral osteophytic spurs > facet joint degeneration > herniated disc

Plain radiograph: seen in AP and oblique. Oblique views helps assess foraminal narrowing
CT: best for seeing uncinate spurs
MRI: useful if suspecting foraminal disc herniation