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Detached osteochondral fragments from the dome of the talus have been described in orthopaedic publications by a variety of confusing terms. A clarification of this conflicting terminology is suggested.We believe that the traumatic etiology of the lesion has been confirmed both clinically and experimentally. The problems of clinical and roentgenographic diagnosis are discussed and illustrated by case histories. Various forms of treatment are evaluated, and the prognosis appraised.