There are many patients with short finger (toe) syndrome and people are looking forward to the bone lengthening technique. In fact, the bone lengthening technique has a long history, but doing it well is not an easy task. It is generally believed that the tension-stress effect during bone lengthening can cause new bone trabeculae and fibrous tissue to align in the direction of traction and gradually transition from the bone end to the central region in the form of mature bone tissue. The mechanical stress generated by traction can stimulate the proliferation of osteoblasts in the traction bone scab and promote the biosynthesis of the bone extracellular matrix. Lengthening speed: Generally, lengthening starts 7 days after surgery, 1mm per day, divided into two times per day, each time rotating the traction device by 1/2 turn (360 degrees of rotation equals 1mm), and every 2 – 4 weeks the film is taken to check the growth of bone scab, adjust the growth and adjust the lengthening speed. Complications include: loosening and breaking of external fixation bracket screws; infection of the nail tract; delayed bone healing, deformed healing, non-healing, early healing; vascular and nerve strain injuries. Therefore, it is important to follow up promptly and prevent actively. Take a look at my case of: