The tendon is composed of collagen fibers, which do not have the ability to contract, and its role is to transmit the contraction force of the muscle to the bone tissue. The tendon fibers are corrugated at rest and disappear when stretched. Microdamage to the collagen fibers can occur when overstretched, and even tendon rupture can occur. How to diagnose local palpable slight absence and subsidence of the muscle belly and tendon junction? 1, A few muscle fibers in level I show light microscopically visible tears with intact surrounding fascia, with muscle pain and local pressure pain during resistance testing. 2.Two levels of muscle fiber rupture, the fascia may have tears, often have a “snap” pull off the feeling, local pain, hematoma formation, local can feel the muscle belly and tendon connection slightly missing and subluxation, pressure pain and mild functional impairment. 3.Tertiary muscle is completely broken, there is severe pain at the time of injury, obvious absence can be felt, there is pressure pain, there may be a large hematoma formation, and the strained muscle function is lost. Muscle injuries can generally be made by physical examination. However, it is sometimes difficult to determine the degree of muscle rupture. High-frequency ultrasound or MRI is an aid to the diagnosis of the degree of muscle rupture and can be used as a means of follow-up. Immediately after a muscle strain, cold treatment should be performed – rinse the area with cold water or apply a cold compress with a towel wrapped in ice decision, and then wrap the injury site with a bandage with appropriate force to prevent swelling. In the relaxation of the injured part of the muscle and elevate the injured limb at the same time, can take some pain, hemostatic drugs. 24 hours to 48 hours after the removal of the bandage. According to the condition of the injury, can be applied externally to activate the blood and reduce swelling ointment, can be appropriate hot compress or use lighter techniques to massage the injury local. If the muscle strain is serious, such as pulling the muscle belly or tendon, you should go to the hospital for surgical suturing as soon as possible.