The diagnosis of osteochondritis is usually made through a combination of history, clinical physical examination, and imaging examinations, as follows: 1. History: Generally, osteochondritis has a history of trauma, such as a fall, local injury to the periosteum or bone, and prolonged strenuous physical activity also predisposes to periosteal pulling and therefore osteochondritis. 2. Clinical physical examination: The most specific feature of osteochondritis is the presence of significant pressure pain at the damaged periosteum. The most specific feature of periostitis is the presence of significant pressure pain at the damaged periosteum and localized swelling and redness when periostitis is more pronounced. 3. Imaging: The presence of periosteal hyperplasia and inflammatory exudate around the periosteum with high signal shadows can be seen on MRI. Combining the results obtained from these methods, a diagnosis of periostitis can be made.