Abstract
Coxa magna is a condition of the hip related to coxa plana. To indicate this relationship it is necessary to outline the etiology of coxa plana, which is more fully discussed in a recent article on coxa plana.1 The common type of coxa plana is a nutritional disturbance of the upper femoral epiphysis due to a certain degree of interference with its circulation by sclerotic changes about the femoral neck. The sclerosis is the result of a preceding inflammation at the joint. When there is a circulatory disturbance of this kind not sufficiently severe to produce coxa plana, there may be enlargement of the femoral head and neck without other noteworthy changes. These cases present the clinical features of coxa plana but are characterized roentgenographically by enlargement of the femoral head and neck instead of by flattening and irregular ossification of the head. This condition is designated coxa magna.
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