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Three different theories about the cause of osteochondrosis dissecans (0. d.) have been much discussed, especially around the twenties of this century. Its origin was considered to be traumatic by a number of authors, but this theory could not explain such features as heredity and symmetrical appearance and therefore has in its exclusive form only a few followers today. The thesis of its embolic origin has been discarded. More and more it has been accepted that a constitutional factor is very important i n the development of this often rather crippling disease. To these attempts a t explanation was added, relatively recently, Ribbing's theory, which reports the presence of a n anatomical substratum connected with 0. d. in the accessory ossification centres (ossicula, osseous nuclei) of the epiphysis, supporting constitu

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Sur le Traitement des Fractures de la Clavicle. Rev. de Ch. W. Lester: Treatment of fractures of thc clavicle. Annals of Surg. Watson-Jones: Fractures and Joint Injuries.