Knee pain and creaking should be considered for reasons such as meniscal injury and knee free, as follows: i. Meniscal injury: When the meniscus is injured, the torn edges of the meniscus may curl up during activity, and a popping sound may occur within the joint, accompanied by pain. This condition should be examined by MRI to clarify whether there is meniscal injury. Knee joint free body: The presence of joint rats also causes knee joint popping sounds and sometimes pain, but this pain tends to occur occasionally and not very often. Third, synovial crepitus syndrome: Synovial crepitus syndrome can occur with knee popping, but in most cases it does not cause significant knee pain.