The present invention relates to a synovial fluid supplement composition comprising hyaluronic acid. The synovial fluid supplement composition suppresses a decrease in the molecular weight of hyaluronic acid and preserves viscoelasticity by satisfying unique conditions in frequency sweep test and rate sweep test, thereby increasing the stability of preparations, and significantly reduces pain that may occur in patients by satisfying the osmotic pressure and pH range similar to normal synovial fluid. Accordingly, the synovial fluid supplement composition is useful for replenishing the synovial fluid lost during arthroscopic surgery, expediting functional recovery due to reduced friction in joints, reducing the risk of surgical site infections in joint surgery, and alleviating pain in patients.
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