A 10-year-old boy complains of increasing pain in his left hip. He began limping shortly after playing a baseball game at school. He is afebrile. An X-ray of the femoral head shows a fracture and irregular densities of the cancellous bone. You make a diagnosis of Legg-Calve-Perthes disease. Which of the following best describes the pathologic findings in this patient?
Avascular osteonecrosis Chondroma Fibrous dysplasia Osteitis fibrosa cystica