Calcium deficiency may cause soreness in the knee joint or other parts of the lower extremities, and may be accompanied by weakness and weakness in the lower back and knees, but calcium deficiency does not cause the sound inside the knee joint when moving. If the patient has this symptom, it may be caused by the following reasons: 1. Injury inside the knee joint, such as damage to the meniscus, cartilage, or ligaments inside the knee joint, similar symptoms may occur. 2. 3. It is also common for patients to develop osteophytes or osteoarthritis in the knee joint.