The quadriceps is the thigh muscle of the human body. Symptoms of quadriceps tendon injury may include pain in the front side of the thigh, swelling, and limited movement. 1. Anterior thigh pain: patients with quadriceps tendon injury, when the damaged tendon triggers an inflammatory reaction, it will lead to anterior thigh pain, especially when the knee flexion and extension activities, the pain symptoms are more obvious. 2. Swelling: when the quadriceps tendon is injured, due to localized combined bleeding and oozing, it will cause the symptom of swelling. 3. Activity limitation: quadriceps is the human thigh muscle, located in front of the thigh muscle, it is one of the largest and most powerful muscles in the human body. Due to the injury of quadriceps tendon, the quadriceps muscle can’t develop force, and the symptoms of activity limitation appear. If symptoms of quadriceps tendon injury occur, it is recommended to go to the hospital in time for early and regular treatment.