Long Island Foot and Ankle Group October 5, 2017 Lesions, ankle conditions, ankle pain, pediatric foot conditions Could Your Child be Suffering from Osteochondritis? Long Island Foot and Ankle Group October 5, 2017 Lesions, ankle conditions, ankle pain, pediatric foot conditions With osteochondritis a lesion forms in the joint where the ends of two bones meet. Usually it is caused by a piece of cartilage that has come loose from the end of one of the bones.