What is the classification standard of joint mobilization and the choice of application?

Grade I: At the beginning of the patient's joint activity, the therapist loosens the joint rhythmically in a small range.

Grade II: The healer loosens the joints back and forth in a large range and rhythmically within the range allowed by the patient's joints, but does not touch the starting point and end point of joint activity.

Grade ⅲ: The healer releases the joint back and forth in a large scale and rhythmically within the range of the patient's joint mobility, and every time he touches the end of joint activity, he can feel the tension of soft tissue around the joint.

Grade Ⅳ: The healer releases the joint rhythmically back and forth in a small range at the end of the patient's joint activity. Every time he touches the end of the joint activity, he can feel the tension of the soft tissue around the joint.

Among the four types of manipulations, I and II are used to treat joint limitation caused by pain, III is used to treat joint pain with stiffness, and IV is used to treat joint movement limitation caused by adhesion and contracture of surrounding tissues.