The healing time for comminuted fractures of the tibia generally takes about three months, but it still depends on the method of treatment. Generally, there are two methods for treating a comminuted fracture of the tibia:

The first method is conservative treatment, which involves using casts or braces to immobilize the affected limb. Generally, the healing time for this method is about three months.

The second method is used when there is significant displacement at the fracture site, such as obvious shortening, rotation, or deformity, which then requires surgical treatment. After surgery, the healing time may take about three to four months. Additionally, severe comminuted fractures can disrupt the blood circulation at the fracture site, leading to poor local circulation and a condition called delayed union, where healing might take about six months.

Another scenario involves extremely severe disruption of the blood circulation at the fracture site, leading to nonunion where the fracture ends do not heal together at all. Generally, this requires about a year of observation. If after one year the fracture ends still haven't healed, a second surgery might be necessary.

However, for most comminuted fractures of the tibia, the general healing time is about three to four months.