Small forearm

Introduction The forearm is small, short and tilted to the ulnar side, dislocation of the humeral head, and limited rotation of the forearm are one of the clinical symptoms of congenital ulnar deficiency. The disease is mostly unilateral, mostly on the right side, more male than female. The child has a thumb and index finger and has a good function. The affected forearm is small, short and tilted to the ulnar side, the humeral head is dislocated, and the forearm rotation function is limited, but the wrist and elbow joint functions are still good. Patients may have a lack of carpal bone at the same time, usually pea bone, hook bone, large angle bone and head bone, and sometimes the 4th and 5th metacarpals are also absent. The humerus protrudes outwardly and becomes more pronounced as the child grows. About 20% of the children have a malformation, and other malformations in the body include a lack of humerus, a clubfoot, and a spina bifida.

Cause

The cause of the disease is caused by the growth inhibition of the second, third and fourth rays in addition to the trunk in the embryonic limb bud. Absence of the ulna is very rare, and partial deficiency is more common.

an examination

Related inspection

Blood routine limb CT examination

The disease is mostly unilateral, mostly on the right side, more male than female. The thumb and index finger existed, and the activity function was good, but the ulnar side column was absent. The affected forearm is small, short and tilted to the ulnar side, the humeral head is dislocated, and the forearm rotation function is limited, but the wrist and elbow joint functions are still good.

Patients may have a lack of carpal bone at the same time, usually pea bone, hook bone, large angle bone and head bone, and sometimes the 4th and 5th metacarpals are also absent. The humerus protrudes outwardly and becomes more pronounced as the child grows. About 20% of the children have a malformation, and other malformations in the body include a lack of humerus, a clubfoot, and a spina bifida.

According to clinical manifestations, accompanying malformations and X-ray features are not difficult to diagnose.

Differential diagnosis

Clinically, it should be differentiated from ulnar developmental disorders caused by ulnar osteomyelitis in infants. The latter has a history of fever and local redness. Limited ulnar development can cause dislocation of the humeral head, but no other malformations.

The disease is mostly unilateral, mostly on the right side, more male than female. The thumb and index finger existed, and the activity function was good, but the ulnar side column was absent. The affected forearm is small, short and tilted to the ulnar side, the humeral head is dislocated, and the forearm rotation function is limited, but the wrist and elbow joint functions are still good. Patients may have a lack of carpal bone at the same time, usually pea bone, hook bone, large angle bone and head bone, and sometimes the 4th and 5th metacarpals are also absent. The humerus protrudes outwardly and becomes more pronounced as the child grows. About 20% of the children have a malformation, and other malformations in the body include a lack of humerus, a clubfoot, and a spina bifida.

According to clinical manifestations, accompanying malformations and X-ray features are not difficult to diagnose.

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