In the present study, The use of ultrasound allows observation of new bone formation in the distraction gap, also visualize the formation of blood vessels in the distraction gap, including the velocity and resistance of blood vessels, and can also indicate the environment of new bone formation. It's considered that ultrasound detection of new bone and angiogenesis in the process of bone lengthening in children could be a good supplement to X-ray evaluation, and even partially replace the former, reducing the radiation burden of pediatric patients.
Age range
18 Years
Sex
ALL
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Gray scale of US in bone gap.
Timeframe: From the first day of lengthening to the removal of the external fixator.（Approximately 6 months.）
New vessels of bone gap.
Timeframe: From the first day of lengthening to the removal of the external fixator.（Approximately 6 months.）
Resistance index of new vessles.
Timeframe: From the first day of lengthening to the removal of the external fixator.（Approximately 6 months.）
Healing index
Timeframe: From the first day of lengthening to 2 months after the removal of the external fixator.（Approximately 8 months.）