There are two possible reasons for painful walking 3 months after the fracture: the first and most common reason is that the fracture end is not healed, the fracture line still exists, the fracture end is not completely encapsulated by the bone scab, and the clinical healing standard has not been reached, nor has the strength to walk on the ground. Therefore, walking on the ground at this time will definitely lead to pain at the fracture end, and in severe cases, it may even lead to fracture displacement at the fracture end. The second more common situation is that although the fracture has healed, the functional exercise has not kept up with the function of the ankle and knee joints, so it will still be painful when walking on the ground, but it is only necessary to strengthen the functional exercise of the joints to gradually recover.