Hello, the knee joint is the largest and most complex joint in the human body, and it is also the joint that is most prone to injury. We often hear that the knee will fail before we get old, so we should pay attention to our knee joint maintenance. We often feel that our knee joint has one problem or another, after reading the following, you will have some understanding of the related disorders, which will be a good promotion for the maintenance of the knee joint. Symptoms Characteristics Pain Increased pain after prolonged standing or walking, with or without morning stiffness Degenerative arthritis Sharp pain at rest when changing position or walking direction, with or without interlocking Cartilage metaplasia or meniscal damage Pain increases when climbing and deep knee flexion Patellofemoral arthropathy Loud sounds Banging or snapping sounds when injured Meniscal or cruciate ligament damage Knee joint Cartilage injury, tendon slippage, patellar subluxation Painful twanging sound that occurs only with deep knee flexion Chondromalacia patella Swelling Immediately after injury Bleeding due to injury to the joint capsule, ligaments, or attachment of the meniscal rim, osteochondral injury Fluid buildup Gradually over 8 to 24 hours Meniscal or articular cartilage injury Occurs after exercise, relieved by rest Accompanied by degenerative chronic Injury Functional abnormalities Joint slippage, separation or dislocation Meniscal injury Joint interlocking Meniscal injury Morning stiffness disappears after activity Degenerative arthritis Knee weakness, unsupportable Patellofemoral joint misalignment, ligaments not strong enough or muscle atrophy