Joint pain when standing and bending may be related to meniscus injury, ligament injury, patella developmental abnormality and other factors. 1. Meniscus injury: joint standing pain bending pain refers to the knee joint. May be related to trauma, such as trauma caused by meniscus injury, especially the posterior horn of the meniscus injury, the posterior horn of the meniscus in standing pressure is not obvious, squatting by the extrusion of the pain will occur. 2. Ligament injury: ligament injury may also be caused by trauma, such as ligament medial and lateral collateral ligaments, in the standing still state, the ligament force is light, the pain is not obvious, in squatting the ligaments are pulled and pain will occur. 3. Abnormal patellar development: if patellar dysplasia, patellar sliding track abnormality, in standing patellar force will not appear pain, in squatting patellofemoral joint surface is squeezed will also cause pain. If the symptoms of knee joint standing pain squatting pain, it is recommended to go to the hospital in a timely manner to improve the examination, to clarify the cause of the disease, and receive regular treatment.