Review Question - QID 210897

A 12-year-old girl presents to her primary care physician with left knee pain for the past 6 weeks. She recently joined the field hockey team at her school. The pain is the most severe when she is running up and down the stairs at the school stadium. The pain decreases when she goes home and rests after practice. She additionally admits to tripping and landing on her left knee 5 days ago. Physical exam shows a knee with a healing abrasion over the left patella. The tibial tuberosity is tender to palpation. A radiograph of the knee is presented in figure A. Which of the following is the most likely diagnosis?