Why does this child take the cutlery wrong? A case of radioulnar synostosis

Radioulnar synostosis is an uncommon congenital anomaly, often bilateral, that produces a limitation of the forearm supination. The origin of this anomaly takes place when a stop is being produced in the differentiation of the cartilaginous outline of the radius and ulna during the embryonic period. There are different types of synostosis. In many cases, the symptoms are mild because it compensates its limitation in pronosupination with hypermobility of other joints of the upper limb. X-ray of upper limbs is diagnostic. The treatment depends on the degree of functionality of the forearm. Surgical treatment would be indicated if there is a severe deformation in pronation that causes serious functional deficits. In any other case, the management will be conservative.