Osteochondrosis of the medial tibial condyle is at the time of writing the most common cause of development of bow leg during childhood in this community. That this condition has not been more widely recognized is undoubtedly on account of the diversity of names by which it has been designated in previous reports. Since Blount1 called attention to it as a cause of acute bending of the legs in children, I have encountered no less than a dozen cases in which the deformity might rightfully be attributed to osteochondrotic changes in the tibial epiphyses. Although the children had received adequate amounts of vitamin D and although other evidence of rickets was wanting, the parents either had been told or were of the opinion that the deformities of the legs were due to that disease. To have been told or to have believed otherwise would not have been in accord