1. Make a physical examination before operation to ensure that you are healthy and mentally normal, and you can correctly view the effect of the operation, without serious organ diseases, hemorrhagic diseases, diabetes, immune diseases and neuromotor dysfunction;

2. There is no local infection at the operation site;

3. Anticoagulants and aspirin are not allowed to be used for half a month before operation;

4. Female patients should try to avoid menstrual period, take a bath before operation and keep clean.

Precautions after operation:

1. Try to reduce the activity as much as possible after operation, so as to facilitate recovery and swelling reduction, but don't stay in bed;

2. Use elastic bandage to raise the affected limb as much as possible within half a month after operation to avoid hematoma and help tighten the skin;

3. Take anti-inflammatory drugs orally according to the doctor's advice for 3 ~ 5 days;