Knee Osteoarthritis Clinical Trial
Official title:
A Randomized, Double-blind, Placebo-controlled Clinical Trial of Methotrexate (MTX) in the Treatment of Advanced Knee Osteoarthritis With Effusion-synovitis
This multicentre randomized placebo-controlled clinical trial aims to evaluate whether methotrexate (MTX) has effects of relieving symptoms and reducing inflammation on advanced knee osteoarthritis (OA) with inflammatory phenotype. Participants will be randomly allocated to either MTX group or placebo group receiving MTX or placebo once a week. The primary outcomes are effusion-synovitis volume measured by magnetic resonance imaging (MRI) and knee pain assessed by visual analogue scale (VAS).
OA is a common chronic musculoskeletal disease in middle-aged and elderly people, which is characterized by loss of articular cartilage and other structural damage of joints. Currently, there is no effective treatment to reduce disease severity and progression of knee OA, particularly in mid to late-stages. Analgesics and anti-inflammatory drugs can only have effects in a short time, with obvious side effects, and are not effective for all patients. In the late stage, most patients are performed with arthroplasty. However, arthroplasty is expensive and has high technical requirements for surgeons. Therefore, it is urgent to find effective drugs or means to control the symptoms and disease progression of knee OA. Due to different etiologies, OA may have different clinical phenotypes, one of which is mainly manifested by synovitis and is common in patients with advanced OA. Pathological studies have shown that OA synovitis is significantly related to adjacent cartilage lesions, and its pathological changes were similar to rheumatoid arthritis (RA), but the degree of the latter is relatively mild. MTX can alleviate joint inflammation and delay joint structural damage. In patients with rheumatoid arthritis, MTX can reduce suprapatellar bursa synovitis by 35%, inhibit the inflammatory response of synovial tissue, including reducing the number of macrophage, inhibiting the expression of intercellular adhesion molecule -1, interleukin (IL)-1, tumour necrosis factor (TNF)-α and C-reactive protein (CRP), and even reduce bone marrow lesions (BMLs) and synovitis in very early stages. In patients with early-stage undifferentiated arthritis, MTX treatment for two months can significantly reduce synovitis and exudation, alleviate BMLs and reduce serum CRP level. Chronic calcium pyrophosphate deposition disease is a non-autoimmunity inflammatory arthritis which can be followed by more severe OA. After 6-81 months of treatment with MTX (5-20 mg/week), the pain intensity, swelling and the number of involved joints were significantly decreased. Based on all the evidence as discussed above, MTX may have beneficial effects on OA via a variety of mechanisms, including reduction of synovitis and effusion, and decreases in inflammatory cytokines. The investigators design a multicentre randomized placebo-controlled clinical trial over 12 months. The aim is to determine if MTX can relieve symptom and reduce effusion-synovitis in patients with advanced knee OA. The investigators will recruit 200 participants who are in the advanced stage of symptomatic knee OA with effusion-synovitis grade of ≥ 2 (assessed by MRI). Participants will be randomly allocated to MTX group (start from 5 mg per week for the first two weeks and increase to 10 mg per week for the second two weeks and 15 mg per week for the remaining period if tolerated) or placebo group. Intention to treat and per protocol analyses of primary and secondary outcomes will be performed. ;
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