Tremendous stress is experienced where the muscle connects by tendons to the bone.
With each movement the tendon is pulled from the bone ultimately causing Tendinitis. With overuse or after a sudden over-extension of the wrist, the muscles of the forearm can be torn from the bone. This tearing at the tendon-bone connection can quickly worsen causing severe elbow pain. On your elbow you can feel two bone protrusions, one on each side of the elbow. The protrusion on the inside, closest to your body is called the Medial Epicondyle and the bone protrusion on the outside of your arm is called the Lateral Epicondyle.