Cranial defect cranioplasty is a surgical procedure to repair a cranial defect Cranioplasty is a procedure commonly used in neurosurgery to repair cranial defects due to various causes. It requires preoperative customization of the repair material, incision of the scalp, replenishment of the material in the defective bone window, and suturing of the subcutaneous layers and the scalp after good fixation with special lap screws to reconstruct a complete closed cranial cavity and reshape the intact shape. Timing of repair: mainly divided into two cases Generally speaking, the timing of repair surgery is different for different cases of cranial defects, mainly divided into two cases. First, for the defect caused by open comminuted skull fracture with relatively clean wound, the defect can be repaired in one stage; second, for the cranial defect caused by closed cranial injury and decompression surgery with debridement due to intracranial hypertension, the cranial repair should be performed early in 2-3 months after surgery. Repair materials: polyetheretherketone PEEK is the new trend In the long-term development of cranial repair surgery, repair materials have undergone several innovations and upgrades. PEEK is a special polymer material with properties very close to human autologous cranial bone, which is highly histocompatible, comfortable and protective after implantation, and can be perfectly shaped by three-dimensional reconstruction, and is gradually becoming a new trend in cranial repair materials. Post-operative attention: After skull repair surgery, patients should pay attention to nutrition and rest, avoid eating spicy and stimulating food in the short term, avoid overworking, and avoid dyeing and perming hair. Moderate exercise activities should be carried out frequently. Generally, you can resume normal life and work one or two months after surgery.