How does the knee make a noise when the leg is straight or bent?

This is joint snapping, and joint snapping is the sound made by human joints during exercise. Joint snapping can be divided into physiological and pathological types. Pathological joint snapping is very complicated, and its etiology, pathology, treatment and prognosis can be consulted by physical rehabilitation therapists and orthopedic surgeons.

Physiological joint click is a crisp, simple and painless popping sound from joint cavity. If the joints of normal adults are suddenly stretched or bent after a period of rest, they will often make a crisp popping sound.

Extended data

Method of joint protection

1. Insist on proper exercise: choose exercises that can increase joint flexibility and extensibility and enhance muscle strength, such as swimming, walking and cycling. And pay attention to prevent the joints from bearing inappropriate external forces during exercise.

2. Avoid excessive use of joints: for example, share the load as much as possible (holding heavy objects with both hands), use large joints (for example, try to use shoulders instead of hands when pushing the door), and maintain a good posture when standing. Patients with knee and hip arthritis should avoid standing, kneeling and squatting for a long time. When standing up from the seat, support the support or knees with both hands.

Baidu encyclopedia-joint snapping up