What is radial inflection hand? A normal hand has two bones in the forearm, the radius and the ulna. In radial abduction hand, the radius bone is underdeveloped, causing the hand to be biased toward the thumb side, along with a thumb defect or dysplasia. Most people with radial abductors have not only dysplasia of the bones and joints, but also abnormal development of the muscles and other soft tissues. The muscles and nerves can be abnormally aligned or even deficient. The most severe types cause severe dysfunction of the hand, wrist, forearm and even the elbow. The entire upper limb will be significantly shorter than normal, the forearm will be significantly bent, and the elbow and fingers will be stiff. The thumb is noticeably short or absent. Radial inflection is a congenital malformation, the cause of which is still unknown, but one thing is clear: the development of radial inflection is not related to the habits of the mother or her behavior during pregnancy. It occurs in the early stages of pregnancy, often between the 28th and 56th day of pregnancy, when the bones of the forearm and hand are formed. It can sometimes be detected during an ultrasound during pregnancy, but can only be treated after birth. The incidence is 1 in 30,000-100,000 births. How much does radial abduction affect hand function? This depends largely on the degree of abnormality of the radius. In most cases, the radius is completely absent, resulting in severe limitation of wrist movement, the elbow joint is often immobile due to fusion, and the thumb is often hypoplastic or absent, affecting hand function. In slightly milder cases, the radius is shorter than the ulna, and the wrist joint is slightly biased toward the thumb. Exercises and braces In infancy, the primary goal of treatment is to achieve and maintain normal wrist and elbow motion. The doctor gives instructions to the parents to carry out repetitive activities over a long period of time to bring the child’s wrist and elbow to a more normal level of motion. In more severe cases a brace or plaster cast is needed to correct the contractured joints, along with joint pulling activities to try to achieve better mobility. Once passive motion is at or near normal, the child will need to wear a brace to maintain normal joint mobility. Surgery is required in most cases, but it is very important to achieve a certain degree of mobility before surgery, even if the deformity cannot be completely corrected with exercise and bracing, in order to improve the efficacy of future surgeries. Surgical treatment is usually performed after the age of 1 year. The main goal is to correct the wrist joint and reconstruct the thumb. If there is an associated abnormality of the elbow joint, correction is also considered. Surgery is staged, with one operation to solve a problem and several months between each operation. Common treatments include: Carpal joint Correction of the flexion of the carpal joint, common procedures include: lengthening; neutralization; ulnar radialization; and bracing: mainly used to maintain position after surgery. Thumb reconstruction: A common and effective method is thumbing of the digit, in which the digit is displaced and transplanted into the position of the thumb after a series of reconstructive procedures to create a thumb with the primary function of a thumb. Efficacy Long-term efficacy depends on the severity. In mild cases, functional recovery is generally satisfactory after rehabilitation and correction throughout the formative years. In severe cases, the development of the affected limb will be impaired, the joint will be more rigid and hand function will be limited.