Haemophilics bleed most frequently into the joints. However, not all haemarthroses will necessarily lead to permanent joint damage. An examination of the twelve large extremity joints of sixty bleeders showed that 23% of the joints were restituted. An example of a haemophilic arthropathy of the knee joints serves to illustrate the fact that even a joint showing roentgenologic changes over a period of many years can heal in the course of the growth of the affected juvenile. The chance of a restitution is the greater, the lesser the joint had been damaged, the lesser the haemarthrosis, and the shorter the period during which the blood remained in the joint.