Review Question - QID 7743

A 30-year-old accountant and recreational softball player, who is seen at the end of his baseball season, reports a several month history of pain along the medial side of his dominant elbow. He cannot identify a specific injury and notes it only hurts when he throws the ball in from the outfield. Besides the pain, he remarks that his speed and distance while throwing have diminished considerably. Examination reveals tenderness along the medial elbow but no weakness or gross instability is found. Radiographs are normal. Based on the history, what is the most likely diagnosis?