#Primary joint motions of underhand throw skin
Blood leaks into tissues under the skin and causes a black-and-blue colour that often turns purple, red, yellow, and green as the bruise heals. Bruises ( contusions), which occur when small blood vessels under the skin tear or rupture, often from a twist, bump, or fall.If nerves or blood vessels have been injured or pinched during the injury, the shoulder, arm, or hand may feel numb, tingly, weak, or cold, or it may look pale or blue. Bruising and swelling may develop soon after the injury. Injuries are the most common cause of shoulder pain.Ī sudden (acute) injury may occur from a fall on an outstretched arm, a direct blow to the shoulder, or abnormal twisting or bending of the shoulder. Home treatment often can help relieve minor aches and pains. Shoulder injuries most commonly occur during sports activities, work-related tasks, projects around the home, or falls. Symptoms may include pain, swelling, numbness, tingling, weakness, changes in temperature or colour, or changes in your range of motion. Shoulder problems can be minor or serious. The acromioclavicular (AC) joint, which lies over the top of the shoulder, is also easily injured. Because of this mobility, the shoulder is more likely to be injured or cause problems.
The shoulder joint has the greatest range of motion of any joint in the body. These bones are held together by muscles, tendons, and ligaments. The shoulder is a ball-and-socket joint with three main bones: the upper arm bone (humerus), collarbone ( clavicle), and shoulder blade (scapula). To better understand shoulder problems and injuries, you may want to review the anatomy and function of the shoulder. Your shoulder joints move every time you move your arms. They can also be caused by the natural process of aging. Shoulder problems develop from everyday wear and tear, overuse, or an injury. Minor shoulder problems, such as sore muscles and aches and pains, are common.
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