Stage

Clinical Findings

Radiographic Findings

I

No limitation of opening

Painless clicking

Normal disc morphology

Mild displacement with early reduction

II

Occasional painful click

Intermittent lock

Mild disc deformity

Moderate displacement with late reduction

III

Limited opening

Frequent painful clicking

Joint tenderness

Displaced, nonreducing disc

IV

Limited opening

Chronic pain

Severe displacement without reduction

Degenerative bony changes

V

Variable joint pain

Joint crepitus

Nonreducing disc with perforation

Degenerative bony changes