repetitive motion at work or doing hobbies like knitting: bursitis. playing tennis or golf: tendonitis (tennis elbow, golfer’s elbow) leaning on your elbows for a long time: nerve entrapment (cubital tunnel syndrome) falling on an outstretched arm: dislocation, fracture.

What muscle causes the elbow to flex or bend?

The muscles involved in flexion (bending) the elbow are the biceps brachii, brachioradialis and the brachialis. The triceps are responsible for elbow extension (straightening the arm).

What is elbow flexion?

When your forearm moves toward your body by bending at your elbow, it’s called elbow flexion. The opposite movement is called elbow extension. The three bones involved in elbow flexion are the: humerus, in your upper arm. ulna, on the little finger side of your forearm.