Chinese orthopedic science considers the pathogenesis of squatting difficulties to be due to disturbances in the flow of Qi and blood. Western medicine considers it to be a chronic soft tissue disease caused by long-term congestion, edema, exudation, tissue degeneration, necrosis, hyperplasia and hypertrophy, with definite soft tissue changes in the tissues surrounding the knee joint. It is a common manifestation of knee disease in middle-aged and elderly people. Difficulty in squatting: X-ray examination, CT examination, MRI examination have to be done X-ray examination, CT examination, MRI examination of effusion in the knee joint is subject to strict orthopaedic and traumatic examination screening, which excludes organic damage to the bone and joint, congenital malformation, skeletal dysplasia, acute inflammation, tumor and other diseases. X-ray examination: It is a medical test, which refers to the examination using echocardiography, CT, nuclear imaging, MRI, etc. X-ray examinations are divided into two categories: general examinations and imaging examinations. Among the former, fluoroscopy and photography are the most basic methods, which are simple and easy to perform and should be used first. Cardiovascular angiography is the rapid injection of contrast into the heart cavity and large blood vessels to show the morphology and hemodynamic changes of the heart and large blood vessel cavities, providing valuable information for the diagnosis of heart and large blood vessel diseases and for surgical treatment. CT examination: It is a kind of full-featured condition detection instrument, which is the abbreviation of electronic computerized X-ray tomography technology. After the electronic computer processes the data, it can take a cross-sectional or three-dimensional image of the part of the body being examined, and find small lesions in any part of the body. NMR: Nuclear magnetic resonance. It is a physical process in which an atomic nucleus with a non-zero magnetic moment, under the action of an external magnetic field, undergoes Zeeman splitting of the spin energy level and resonates to absorb a certain frequency of radio frequency radiation. Nuclear magnetic resonance spectroscopy is a branch of spectroscopy whose resonance frequency is in the RF band and the corresponding jump is the jump of nuclear spins on the nuclear Zeeman energy level.