Shoulder joints are part of your body where your arm bones meet at your torso. Two main shoulder joints connect your shoulder blade, upper arm and collarbone. They allow you to use your arms and give you a wide range of motion. 

The three bones in your shoulder are your:

• Shoulder blade (scapula).
• Collarbone (clavicle).
• Upper arm bone (humerus).

Because of the motion of these three bones at your shoulder joint, the arm can be moved to position the elbow and hand.

Common conditions 

You move your shoulder joints often. This can lead to common injuries or wear and tear that include:

• Joint sprain: A ligament in your shoulder joint that overstretches or tears.
• Dislocated shoulder: The ball (humeral head) separates from the glenoid cavity of the scapula.
• Arthritis: Pain and inflammation of your joints.
• Bursitis: The fluid-filled sac in your joint swells up.
• Tendinitis: Inflammation of the tendons in your shoulder.
• Shoulder fracture: A break in one of your shoulder bones that connect at the joint.

Symptoms 

The most common symptoms that affect your shoulder joints include:

• Pain.
• Swelling.
• Stiff muscles.
• Skin discoloration or bruising.
• Limited movement, pain with movement or not being able to use your arm as you normally do.