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You are seeing a thirty-year-old male in clinic who has presented with knee pain. Upon questioning, the patient explains that the pain is at the front of his knee, appeared over the course of two weeks and is now continuous and is relieved by rest. He complains that the pain is worse when he goes running. On examination you note tenderness over he tibial tuberosity, which is made worse when flexing the knee against resistance. You also notice a bony enlargement of the tibial tuberosity. What is the most likely diagnosis?