Stage | Plain radiograph findings | Magnetic resonance imaging findings | Arthroscopic findings |
I | Depressed osteochondral fragment | Articular cartilage thickening and low signal changes | Irregular and softened articular cartilage with no fragment |
II | Osteochondral fragment attached by an osseous bridge | Articular cartilage breached, low signal rim behind fragment representing fibrous attachment | Articular cartilage breached with definable fragment that is not displaceable |
III | Detached, nondisplaced fragment | Articular cartilage breached, high signal changes behind fragment indicating synovial fluid between fragment and subchondral bone | Articular cartilage breached with definable fragment that is displaceable but attached by overlying articular cartilage |
IV | Displaced fragment | Loose foreign body | Loose foreign body |
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