Knee Instability: Reasons, Symptoms, Evaluation, Complications, Treatment And Rehabilitation Instability of the knee joint is a widely reported orthopedic problem where the knee feels weak. Many patients describe it as the knee slipping suddenly during movement or while standing up. At our orthopedic center, we commonly manage such cases using https://www.diigo.com/item/note/b2kov/mshj?k=29a3d87bdb7eab925025ae3b3f836270