Hyaluronic acid, also known as hyaluronan, is a clear, viscous substance produced naturally by your body. The largest amounts of hyaluronic acid in the body are found in the skin, connective tissue, and eyes. Its main function is to retain water, keeping the body's tissues moist and well lubricated. Hyaluronic acid has many uses.

Direct injection of pain relief into the joint is a quick method of pain relief but can bring many disadvantages, especially with small joints, it is difficult to achieve high accuracy. Therefore, the support of guidance tools such as using X-ray enhancement is needed.

Joint pain relief injections usually only require direct needle puncture. However, in difficult cases, small deep joints, digital subtraction imaging guidance is needed to ensure accuracy and patient safety.