Most people who have prominent bone structures on both sides of the shoulder are very thin, especially if the muscles on the outside of the shoulder joint are relatively thin. The normal bones on both sides of the shoulder joint are the outer side of the human scapula, and this position is usually covered and hidden by the deltoid muscle above the shoulder joint. However, in people who are relatively undernourished and thin, the bones of the shoulder joints on both sides will protrude significantly and the deltoid muscle will be thin. However, in this case, there are usually no uncomfortable symptoms, and the movement of the shoulder joint is normal. It is also possible that the shoulder joint has abnormal bone development, which may cause the bones of the shoulder joint to protrude on both sides, but this is usually not accompanied by pain or limited movement. If there is pain and limited movement of the shoulder joint on both sides, you should consider whether it is a subluxation or other shoulder joint disorder, or a developmental disorder that causes a localized protrusion.