Usually, a fracture of the lower middle 1/3 of the tibia will heal without a bone scab for 40 days, indicating that the formation of the bone scab is slow, and usually a bone scab will form in about 12 weeks. A fracture of the lower middle 1/3 of the tibia is one of the most common lower extremity traumas in the clinic, and the bone scab is an injury scab formed by the bone during the healing process. Normally, a tibia fracture will form a bone scab in about 12 weeks, or 84 days, so a fracture of the lower middle 1/3 of the tibia that has not had a bone scab for 40 days will still heal, and the patient does not need to be overly concerned. Usually, 1~2 weeks after tibia fracture belongs to the early stage, when there is no bone scab formation. 3~8 weeks after the fracture belongs to the middle stage, at this stage there will be enough bone scab formation. And by 8~12 weeks, the bone scab usually has been shaped and completed. At this time, patients need to strengthen rehabilitation training, balanced nutrition, and pay more attention to rest. To summarize, patients with tibia fracture need to go to the hospital for follow-up on time, and follow the doctor’s instructions to carry out functional exercises for the lower limbs, which is conducive to the formation of the bone scab.