Liu Xiang retired from the last race with an Achilles tendon injury to this London Olympics with a ruptured Achilles tendon, his injury has a long process from quantitative to qualitative change, if he can actively prevent it in the early stage, perhaps this sorry scene on the field will not happen. Nevertheless, he is still a hero in our hearts, and we hope that he and his team will add some consideration to the objective laws in addition to their passion for serving their country, so that perhaps they can more fully realize his potential. The Achilles tendon is the largest tendon in the human body, and also the most loaded tendon, if you do not understand his habits, and simply let it bear the weight, do not let it rest and maintenance, it will demonstrate with severe pain, and even break to you, the following from the medical point of view to talk about the protection of the Achilles tendon common sense. First, protect the skin on the surface of the Achilles tendon. The Achilles tendon does not have a tendon sheath, but its frequent sliding nature of work is very much in need of a tendon sheath, and it is the tissue around the tendon that plays the role of a tendon sheath. There are several layers of connective tissue around the Achilles tendon that form the lubrication layer, and each layer can slide between them. Liu Xiang likes to wear short socks in his early years for training or competition, which makes the skin after the Achilles tendon rub directly with the upper of the shoes, causing skin damage. Especially when the upper is hard and sharp, the damage is faster. After the skin is rubbed and blistered, it is easy to cause infection if you pick yourself. Infection not only makes the sliding function of the tissue around the tendon disappear, but also destroys the blood flow and damages the tendon itself, causing the tendon tissue to degenerate and lose strength. Therefore, the socks worn during exercise should be higher than the upper of the shoe, and the upper of the shoe should preferably be made of soft material and can distribute some of the pressure to both sides of the Achilles tendon. Second, recognize the mechanics of the Achilles tendon. From the anatomical point of view, the muscles involved in bouncing are not only limited to the triceps and its continuation, the muscle force acting on the Achilles tendon accounts for about 87% of the bouncing force of the ankle joint. The rest is undertaken by the posterior tibial muscles, peroneal muscles and plantar flexor muscle groups to assist. In the whole process of plantar stepping (ankle plantar flexion), when the ankle from the dorsal extension position (foot and calf angle less than 90 °) began to force, the Achilles tendon is in a state of extreme tension, compared to the auxiliary muscle group is more relaxed, at this time, such as a sudden jump, the Achilles tendon tension is bound to bear the brunt, can be ruptured; on the contrary, in the ankle plantar flexion position (foot and calf angle greater than 90 °) when jumping, the Achilles tendon tension is correspondingly reduced In contrast, the auxiliary muscles take on more tasks, and the possibility of Achilles tendon rupture is greatly reduced. Therefore, before doing half squatting and jumping, which increase the burden on the Achilles tendon, you should make sure that you are doing adequate preparatory activities based on the usual progressive training. Overload training and overtraining are predisposing factors for chronic Achilles tendonitis and Achilles tendon rupture. Third, avoid the use of fluoroquinol similar antibiotics. Fluoroquinol like antibiotics have been widely used to treat infectious diseases. The phonetic name is xxfloxacin. The common ones are ofloxacin, ciprofloxacin, lomefloxacin and so on. There have been a large number of cases proving that this class of antibiotics can cause acute Achilles tendonitis and even Achilles tendon rupture. Substitute other classes of antibiotics whenever possible. Fourth, proper rest and treatment. The repair time for an Achilles tendon injury is 6 weeks, and stress should be avoided in the early stages and appropriate functional exercises should be performed in the later stages under medical supervision. Training with injury often loses the best time for healing. Sealing can be anti-inflammatory and pain-relieving, and is commonly used for peri-Angel tendonitis. However, it has the effect of inhibiting fibroblasts and should not be used during the Achilles tendon repair period. Physiotherapy, massage, and wedge shoes are all effective adjuncts for peri-Angel tendonitis. Once the Achilles tendon is ruptured, surgical repair is the most effective method.