The concept of a bone fissure refers to a condition where the bone is not completely broken but is partially cracked, known as a fissure. The treatment for a bone fissure generally involves plaster fixation, typically for a duration of four to six weeks. However, an old injury refers to a chronic fissure that has been present for three weeks or more. If the fissure is three weeks old, it should continue to be immobilized with plaster, avoiding weight-bearing walking and activities. Plaster fixation can gradually allow the fracture ends to heal. If after four to six weeks, or even two months, the fracture ends have not healed, further surgical treatment may be required.