Abstract
Intra-articular injection of hyaluronic acid (HA) is well known to improved pain and function in patients with osteoarthritis (OA) [1,2]. As for rheumatoid arthritis (RA) patients with knee osteoarthritis, current medication for injection therapy includes steroid, hyaluronic acid, and platelet-rich plasma (PRP). In this article, we collected current studies regarding to this issue and suggest future possible research direction.
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