TABLE II.

Classification Systems for OCD of the Elbow^*

Radiography	MRI	Ultrasound	Lesion Stability	Arthroscopy
Minami et al.260 (1979) Grade 1: Translucent cystic shadow in the lateral or middle aspect of the capitellum Grade 2: Clear zone or split line between the lesion and the adjacent subchondral bone Grade 3: Loose bodies	Dipaola et al.253 (1991) Stage I: Thickening of articular cartilage and low-signal changes Stage II: Articular cartilage breached and low-signal rim behind fragment indicating fibrous attachment Stage III: Articular cartilage breached and high-signal changes behind fragment indicating synovial fluid between fragment and underlying subchondral bone Stage IV: Loose body	Takahara et al.115 (2000) Type I: Lesion with localized subchondral bone flattening and cartilaginous thickening Type II: Lesion with nondisplaced fragments and an intact articular surface Type III: Lesion with displaced fragment Type IV: Lesion with osteochondral defect	Takahara et al.131 (2007) Stable (ICRS I): open capitellar physis, normal elbow motion, and Minami grade I Unstable (ICRS II-IV): Closed capitellar physis, restricted elbow motion >20°, and Minami grade II or III Kolmodin and Saluan modification261 (2014) Type I (stable): open capitellar physis, Minami grade I, and normal elbow motion Type II (unstable): Closed capitellar physis, Minami grade II or III, and motion restricted >20°, medial to the radial head center line Type IIIa (unstable): Closed capitellar physis, Minami grade II or III, and motion restricted >20°, extending lateral to the radial head center line Type IIIb (unstable): Closed capitellar physis, Minami grade II or III, and motion restricted >20°, extending lateral to the radial head center line including the lateral margin	Brittberg and Winalski256 (2003) ICRS OCD I: Stable lesions with a continuous but softened area covered by intact cartilage ICRS OCD II: Lesions with partial discontinuity that are stable when probed ICRS OCD III: Lesions with a complete discontinuity that are not yet dislocated (“dead in situ”) ICRS OCD IV: Empty defects as well as defects with a dislocated fragment or a loose fragment within the bed

^*OCD = osteochondritis dissecans, MRI = magnetic resonance imaging, and ICRS = International Cartilage Repair Society.