Rattling of the bone at the base of the thigh when walking may be due to several mechanisms: First, it may be due to bursitis of the hip. This disease tends to flare up easily on the outside of the hip joint, which is the area of the greater trochanter. The bursa here may become inflamed if it is irritated by excessive friction, or by factors such as cold, which in turn leads to significant pain and swelling here. When the patient walks, this area may cause friction with the outer muscles and tendons, which in turn leads to a noise. Second, this condition may be caused by muscle contracture in the hip. For example, if there is a contracture of the vastus tensor muscle on the outside of the hip joint, it may also produce a noise when the hip moves, that is, when walking. This situation is often caused by some trauma to the lateral hip joint, or cold, or long-term braking and other factors. Osteoarthritis of the hip joint. The causes of this type of osteoarthritis may be many. For example, it may be due to necrosis of the femoral head, resulting in the collapse of the femoral head, followed by abnormal wear and tear of the hip. It may also occur due to excessive weight bearing on the hip over a long period of time, causing excessive wear and tear on the hip. In short, this type of osteoarthritis can cause the hip to rattle during movement.