A cortical crease is a specific type of fracture that is a relatively minor bone injury. While a fracture refers to a break in the continuous structure of the bone, a cortical crease refers to a bone that is mildly damaged but not completely disconnected. A cortical crease is a condition in which the cortex of the bone is not significantly displaced or broken, but is compressed and creased. Bone cortical folds often show symptoms such as pain and swelling, but this type of fracture is a more stable fracture and generally does not require surgical treatment, and can heal gradually after immobilization in a cast or external brace. When the symptoms of cortical folds occur, you should seek medical treatment in time. During the recovery period, you should rest more, avoid physical activities, and consume more high-quality protein food, which is conducive to the recovery of cortical folds.