Cranial defects are a relatively common clinical disorder and a major hazard, and cranial repair is generally recommended for larger cranial defects. The cranial repair surgery involves the question of what cranial repair material to use. At present, it is mainly recommended to use artificial materials for repair, such as the traditional conventional widely used titanium mesh material, and in recent years, the new polyether ether ketone PEEK material, PEEK performance is still more excellent. In addition to artificial materials, some people also choose to use autologous cranial bone for repair, but we do not recommend doing so, why? Because autologous cranial bone may resorb! Many patients who encounter this problem are also asking, what if the autologous cranial bone is absorbed? Let’s take a look at why autologous cranial bone is resorbed. When using autologous cranial bone repair, the first issue is how to preserve the autologous bone flap. This is divided into in vitro preservation and in vivo preservation. If it is preserved in vitro, then the preservation conditions are rather harsh, generally need low temperature liquid nitrogen preservation, many places do not have such preservation equipment and preservation conditions, even if there is, then the preservation cost will be relatively high, even if such preservation conditions are achieved, the bone may be inactivated after low temperature preservation, and the repair will also lead to absorption; there are also people directly preserved with alcohol soak, or put into the regular ordinary refrigerator preservation, that It is even more unreliable and will resorb even more, and even cause bone flap infection. If the bone flap is preserved in vivo, clinically there are people who have carried out such preservation methods, burying the bone flap under the belly or under the skin of the leg, one of such preservation methods is the need to open a second surgical area, increasing the risk of complications, such as the occurrence of infection; in addition, the bone flap will be buried in other parts of the body, it may start to absorb, and when it is time to repair, it will already be a small circle when it is removed, and it will continue to absorb after implanting the bone window in the head to repair. Absorption. What happens when the autologous skull bone is absorbed? If necessary, we need to operate again and use a better artificial material to repair the skull again, currently the better is polyether ether ketone PEEK material.