The choice on regardless of whether to obtain surgery to address arthritis with the knee joint depends upon many variables, such as: The synovial membrane secretes synovial fluid (a clear, sticky fluid) round the joint to lubricate it. Ligament. A sort of tough, elastic connective tissue that surrounds the joint https://www.theorthopaedicandpainpractice.com/the-benefits-and-risks-of-knee-replacement-surgery/