To compare the neurological recovery and complication rate of autogenous cranioplasty(CP) within 6 weeks after decompressive craniectomy (DC) with that of autogenous cranioplasty within 3\~6 months after DC.
Decompressive craniectomy due to craniocerebral trauma, cerebral ischemia and cerebral hemorrhage.
Age 18 - 80 years.
The first time for cranial repair.
unilateral skull defect.
Poor healing of skin flap (active infection, non-healing, necrosis, sinus, thin or poor blood supply, etc.).
Fracture of bone flap ≥2 pieces, partial open fracture
Intracranial infection before operation.
Severe bone metabolic diseases.