Creaking sounds when moving the knee are mainly due to the following reasons: 1. Osteoarthritis of the knee joint. This disease occurs mainly due to prolonged walking in daily life, as well as excessive weight bearing in daily life or due to prolonged standing, resulting in wear and tear of the articular cartilage. This leads to a decrease in synovial fluid secretion, which can cause the joints to creak when walking or going up or down stairs in daily life. 2. Meniscal damage. After the meniscus is damaged, the meniscus will become partially stuck, which will cause a sound when the joint is moving and will be accompanied by pain.