Why Do People Develop Synovitis in the Knee?

　　Synovitis is a common joint disorder encountered in daily life. It is typically triggered by certain stimuli affecting the joint—such as cold exposure, prolonged static postures, or localized joint trauma. Synovitis is generally classified into two types: non-specific synovitis and specific synovitis. Among all joints in the body, the knee joint is the most susceptible to synovitis. So why does synovitis occur in the knee?

　　Why Does Synovitis Occur in the Knee?

　　Knee joint disorders can lead to knee synovitis. When abnormalities arise in the knee, they may cause synovial hyperplasia and knee edema, resulting in synovitis. Overuse of the knee joint—such as excessive walking (e.g., tens of thousands of steps per day) or running by individuals unaccustomed to physical activity—can cause overstrain or trauma, potentially leading to knee synovitis. Degenerative knee osteoarthritis, commonly seen in middle-aged and elderly individuals, may also trigger knee synovitis. Autoimmune diseases—including rheumatoid arthritis, ankylosing spondylitis, and psoriasis—can likewise induce knee synovitis. Gouty arthritis, caused by elevated serum uric acid levels and subsequent deposition of uric acid crystals within the knee joint, may result in joint damage and synovitis. Infectious conditions—such as bacterial, fungal, or Mycobacterium tuberculosis infection of the joint—can also cause knee synovitis.

　　Following onset of synovitis, patients primarily experience swelling, pain, and restricted joint mobility. Palpation of the affected joint often reveals a fluid wave—a sign indicating intra-articular fluid accumulation. Therefore, once diagnosed with synovitis of the upper arm (e.g., elbow or shoulder), patients must minimize mechanical stress on the joint, avoid trauma, and prevent cold exposure to prevent symptom exacerbation. During acute symptomatic phases, joint immobilization, administration of nonsteroidal anti-inflammatory drugs (NSAIDs), and adjunctive use of blood-activating and stasis-resolving herbal medicines may be employed to alleviate symptoms and promote recovery.

　　Dietary recommendations include consuming foods that strengthen muscles and bones, dispel wind-dampness, and emphasize warming properties. Foods such as red dates, dog meat, and lamb—considered “warming” in traditional dietary theory—are beneficial. Additionally, increasing intake of high-quality proteins and essential vitamins is advised. We hope this information proves helpful to you.