“Doctor, my finger was poked when I was playing basketball, and it’s been 1 week since I got it. What can I do to restore it to its previous state?” The surgeons often hear this question during the summer, because the chance of hand injury increases greatly when children go out to play basketball after the holidays. So what’s going on here? It turns out that this is the medical term “hammer finger”. The hammer finger is named after the shape of the finger deformity, that is, the distal segment of the finger can not be actively straightened, a drooping deformity, the proximal side of the finger joint slightly up. The root cause is a break in the extensor tendon stop of the distal phalanges, resulting in hammer-shaped fingers. The hammer finger is not easily noticed. When children jump for the basketball and their fingers hit the basketball at speed, most of them can faintly hear a clicking sound followed by a sharp pain. But generally the children will persist in the game with injuries in order to show their bravery. At the end of the game, when they saw that their injured fingers were flexed and could not be straightened, and that they were sore and swollen, many of the young men returned home, afraid to tell the adults in order to avoid the reproach of their parents, and rummaged through the medicine chest to rub some swelling and pain relieving drops. A few days later, the swelling and pain did go away, but the end of the finger still can not straighten, drooping like a small hammer. I had no choice but to tell my parents the truth, but by this time the best treatment period had passed. Surgery may be needed. Because tendons are elastic, they shrink back like a rubber band over time. For old hammer fingers, surgery is more difficult and the results are less desirable. What to do when a hammer finger occurs 1, immediately stop the activities of the injured finger; 2, if there is no obvious wound, immediately apply an ice pack or towel-wrapped popsicle to the finger to reduce the occurrence of internal vascular bleeding and swelling; 3, do not mistake the finger dislocation and try to pull to reset, repeated pressure and rubbing will aggravate the swelling, and even make the hammer finger end of the avulsed bone displaced, bringing difficulties for further treatment; 4, Do not mistake the sprained finger for repeated rubbing or activity of the injured finger, which can lead to re-displacement of the avulsed fracture fragment or tendon retraction; 5. Early treatment should be sought at the hospital. Immobilize with plaster or aluminum plate for 4 to 6 weeks.