Medically reviewed by Scott Zashin, MD Rheumatoid arthritis (RA) is known for causing all-over inflammation and pain. It happens when the immune system malfunctions and attacks the synovium, the ...

The scapula (shoulder blade), clavicle (collarbone) and humerus (upper arm bone) rely heavily on the coordination of muscles like the rotator cuff, trapezius, serratus anterior and deltoids to ...

Ball and socket joint. Articulating bones are humerus and scapula (the clavicle is not part of the shoulder joint). Allows a great range of movement in all directions. Many muscles are used to ...