![]() When the bursa become inflamed, you may feel a painful stabbing or warmth and hear a “pop” when you try to move your arms in any direction. Scapulothoracic bursitisįluid-filled sacs called bursa protect your joints and help the surfaces of your joint and socket to move in harmony. Here are some common causes of that popping sound you may be hearing. The same anatomy that enables a full range of motion also leaves your shoulder more vulnerable to injury than your other joints. ![]() Your shoulder joint is connected in a way that enables maximum mobility of your arms. A structure made of cartilage, called the labrum, acts as a sort of soft cup inside your shoulder blade that holds your arm in place. Your humerus bone fits underneath and inside of your scapula, or shoulder blade, and four muscles called the rotator cuff connect them. Your shoulder is arranged in a ball-and-socket joint configuration.
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