To compare the effect and safety between Tripterygium Wilfordii Film (TNF) and Compound Tripterygium Wilfordii Film (CTWF) for osteoarthritis of knees.

• 目的]比较单味雷公藤涂膜剂和复方雷公藤涂膜剂（主要由雷公藤、川芎、乳香、没药、生南星等组成）对膝骨关节炎的临床疗效及安全性。