How is fluid accumulation in the knee formed?
Disease description:
Every time it gets cloudy and rainy, the knee starts to hurt. After going to the hospital for an examination, fluid accumulation in the knee was discovered. How does this condition develop?
Doctor's answer (1)
Dr. Chen Jian
Knee joint effusion, also known as synovitis or fluid accumulation in the knee joint, is primarily caused by irritation or inflammatory reactions of the synovial tissue within the knee joint. Under normal circumstances, a small amount of synovial fluid exists inside the knee joint. This synovial fluid, secreted by the synovial membrane, serves to lubricate and nourish the articular cartilage. However, when inflammation occurs in the synovial membrane, it secretes excessive synovial fluid, leading to an increased volume of fluid within the joint cavity, resulting in knee joint effusion.
Common causes of knee joint effusion include:
1. Knee joint injuries: such as sprains, fractures with dislocation, or meniscus damage, which may stimulate the synovial membrane to produce excess fluid.
2. Chronic inflammation of the knee joint: such as synovitis, rheumatic arthritis, or rheumatoid arthritis, which may also lead to fluid accumulation. These inflammatory conditions stimulate the synovial membrane, causing secretion imbalance and resulting in effusion.
3. Infections: invasion of microorganisms such as bacteria or viruses into the knee joint may cause infectious synovitis, leading to abnormal increase in synovial fluid.
4. Excessive activity or exercise: prolonged high-intensity exercise or improper posture during physical activity can overload the knee joint, causing the synovial membrane to overproduce synovial fluid.
