There are too many anxious moms nowadays! Clinic can often see some baby moms with babies, said let me look at the development of the child’s fingers, the child’s fingers thin, than the same age baby “small one”, also do not love to move the fingers, for fear that there will be some kind of dysplasia and so on …… Then I will give the baby to do! After the physical examination, finally found that parents like to take around other children of the same age for comparison, but in fact, other children are too fat, their baby’s finger development is very normal. This kind of anxiety about children’s growth and development is becoming more and more common. Children are the treasures of their parents, in the mouth for fear of melting, in the hands for fear of flying. I can especially understand this kind of “love for children” of parents. It is not advisable to worry for no reason, but thumb dysplasia is becoming more and more frequent, parents must be careful. What is thumb dysplasia? In layman’s terms, that is, when the baby was born or with age, the thumb will not move, looks smaller than the opposite side, or there is a deformity visible to the naked eye, then we should pay attention to whether there is thumb dysplasia. How to identify it, we can look at the typology of thumb dysplasia: according to the severity, from mild to severe, it can be divided into five types. Type 1 The thumb is only slightly smaller in appearance, with no obvious tissue or structural defects and no abnormalities in thumb function. No special treatment is needed for this type. Type 2 The combination of type 1 is characterized by atrophy of the teres major muscle, narrowing of the tiger’s mouth, and instability of the metacarpophalangeal joint of the thumb. The opposite metacarpal function is often poor, so we need to surgically reconstruct the opposite metacarpal function to improve the thumb function. Type 3 On the basis of type 2, there is a combination of abnormalities of the extrinsic muscles and tendons, such as the absence of the teres major muscle and abnormalities of the flexor digitorum longus tendon. Type 4 The metacarpal bone is completely absent, and the thumb is connected to the hand only by the soft tissue of the skin with blood vessels, so the thumb appears to be “floating”, and is therefore also known as the “floating thumb”. Type 5 The thumb is completely absent, with abnormal changes in the muscles and tendons of the hand, and the neurovascular bundle has lost its normal anatomical structure. For the latter three types of thumb dysplasia, especially types 4 and 5, reconstruction of the thumb function is essential. The traditional treatment is to perform “bunionization”, i.e., to “remodel” the index finger to look like a thumb in order to improve the function of the entire hand. However, after the surgery, the child is left with only four fingers. This is unacceptable to most parents. Is it possible to save five fingers? For this reason, a “metatarsal reconstruction” procedure has been developed, in which a portion of the fourth metatarsal bone of the child’s foot is grafted onto the first metacarpal bone to form a joint with the carpal bone, thus providing the skeletal basis for good carpometacarpal joint function and preserving the five fingers. However, the disadvantage is that the child’s foot can not bear weight for three months after the operation, which requires at least three months of the foot can not touch the ground; at the same time, the operation time is longer, the risk is higher, whether free bone grafting or anastomotic vascular bone grafting, there is a certain resorption, necrosis chance. Currently, the latest treatment plan is “half metacarpal bone graft reconstruction” surgery, which does not need to take bone from the foot, but take part of the metacarpal bone from the second metacarpal bone to rebuild the first metacarpal bone, which can achieve the purpose of preserving the five fingers after the surgery. Studies have shown that bone resorption and necrosis after hemimetacarpal bone graft reconstruction is less likely than metatarsal bone graft reconstruction, and that both the donor and recipient areas of the grafted bone will continue to grow after surgery. What’s more, children can undergo the procedure between the ages of 6 months and 1 year, which can help establish thumb function earlier. Finger deformity, which can cause limited finger function, affects the child’s normal life, and even causes low self-esteem, affecting physical and mental health.