Cranial repair is a very important thing, it is an important measure to repair cranial defects caused by many reasons, it is not easy to find in normal times, but it will become more and more serious, so is it too late to do cranial repair surgery after one year? Cranial defect is a relatively common craniofacial disorder. Every year, a large number of people in China suffer from cranial defect due to one reason or another (car accident, fall from height, craniofacial surgery, etc.). Skull defect can bring serious harm, the lack of hard shell protection, intracranial tissue will be vulnerable to external direct injury; In addition, the lack of part of the skull, the destruction of the closed cranial environment, intracranial pressure instability, intracranial blood circulation, cerebrospinal fluid circulation, etc. are affected, can lead to a series of neurological deficits; skull shape incomplete, will also cause psychological trauma to patients, autism, low self-esteem, and even some patients have a series of neurological deficits, The incomplete skull shape can also cause trauma to the patient’s psyche, self-loathing, low self-esteem, and even depressive tendency in some patients, or even anorexia. Therefore, once cranial defect occurs, cranial repair should be performed in time to solve the problems such as no effective protection of brain tissue in the defect area, blood supply disorder and abnormal cerebrospinal fluid circulation, to repair the intact skull shape and restore the patient’s self-confidence. The timing of cranial repair is very important, and some patients ask if they can still have cranial repair after more than a year. Yes, you can. Generally speaking, the skull defect should be repaired within 3 months, and if it has been more than a year, the skull repair should be performed as soon as possible to avoid more adverse symptoms. It is also very important to choose the material for cranial repair. There is a very advanced material called polyether ether ketone, commonly known as PEEK material. This is a special polymer material, its properties are very close to the autologous cranial bone, biocompatible, can be complex shaping, excellent mechanical properties, good protective properties, gradually become the trend of cranial bone repair materials.