Knee throbbing sensation like pulse is considered to be related to excessive fatigue, quadriceps contracture, synovitis and other reasons. 1. Excessive fatigue: when the legs are overly exercised and fatigue occurs, it will cause the muscles around the knee joint to undergo voluntary contraction, resulting in excessive lactic acid secretion, which will stimulate the muscles to undergo tense contraction, manifesting itself in the symptom of the knee throbbing like a pulse. 2. Quadriceps contracture: for example, quadriceps lesion, patella development abnormality and other reasons, can make the muscle power imbalance, resulting in quadriceps contracture or muscle tremor phenomenon, so that the knee appears to beat like a pulse. 3. Synovitis: When you have synovitis, it will cause the synovial membrane to secrete a large amount of synovial fluid, resulting in a large amount of water in the knee joint, which will increase the pressure in the knee joint, resulting in a pulsating sensation in the knee. There are also other reasons that can cause the knee to feel like a pulse. When the knee feels like a pulse, you should pay attention to resting the leg and avoid overworking the leg. At the same time, it is recommended to go to the hospital, after clarifying the cause of the disease, to carry out targeted treatment, so as to avoid delaying the condition.