There are many reasons for knee popping accompanied by pain, the common ones are knee meniscus injury, knee osteoarthritis, patella developmental abnormality and so on.
1. Knee meniscus injury: the integrity and continuity of the meniscus is damaged due to strenuous exercise or sprain, manifesting as joint swelling and pain, which may be accompanied by muscle atrophy of quadriceps muscle and joint popping.
2. Osteoarthritis of knee joint: due to the degenerative disease of articular cartilage of knee joint and secondary osteophytes, it progresses slowly, and with the passage of time, knee popping, joint pain, swelling and stiffness, deformity and so on, resulting in the affected limbs not being able to move flexibly.
3. Abnormal patella development: such as high patella, patella tilt, etc., may have knee popping with pain.
Knee popping accompanied by pain may have other reasons, such as chondromalacia patella, etc. If there is an unknown cause of joint popping accompanied by pain should go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, standardized treatment under the guidance of the doctor.