Nerve entrapment occurs when there is either dislocation, degeneration, direct trauma, compression of the nerves due to the thickening of the retinaculum. Onset of nerve entrapment is gradual. Symptoms are swelling, medial elbow pain with numbness and tingling. An unusual sensation that travels into the 4th and 5th fingers. With nerve entrapment is it important that you avoid repetitive activities and pressure on the nerves.