Table 1.

Classifications of capitellar osteochondritis dissecans (OCD)

Minami classification of capitellar OCD (X-ray)		Itsubo classification of capitellar OCD (MRI)		Clanton and DeLee classification of knee OCD (CT)
I	Localized flattening or radiolucency	1	Normally shaped capitellum with several spotted areas of high signal intensity lower than that of cartilage	1	Depressed osteochondral fracture
		2	Stage 1 + several spotted areas of higher intensity than that of cartilage	2	Osteochondral fragment attached by an osseous bridge
		3	Stage 2 + both discontinuity and noncircularity of the chondral surface signal of capitellum and no high signal interface between lesion and floor
II	Nondisplaced fragment	4	Lesion separated by a high intensity line in comparison with cartilage	3	Detached non-displaced fragment
III	Displaced or detached fragment	5	Capitellar lesion displaced from floor or defect of the capitellar lesion	4	Displaced fragment

CT, computed tomography; MRI, magnetic resonance imaging.

Stable lesions: Minami grade I, Itsubo stages 1–2 and Clanton and DeLee stages 1–2.

Unstable lesions: Minami grade II–III, Itsubo stages 3–5, and Clanton and DeLee stages 3–4.