Alternatively, cements which are made from calcium phosphate have a better purchase to bone and supersede PMMA as void fillers. Cements that are resorbable can be tailored to provide sufficient rigidity to allow bone healing and retain mechanical strength for a period of time. Subsequently the cement undergoes degradation and is eventually replaced by the host bone. Another advantage of using cements is the possibility of early weight bearing. The advantage of cementing screws is the intimate screw-cement interface, which increases the holding power. An innovative screw design which facilitates PMMA augmentation is the ported screw. Bone cement can be injected into the screw shaft and then flows via side holes into the surrounding bone. The holding power was 278% greater than the holding power of a standard screw
Alternatively, cements which are made from calcium phosphate have a better purchase to bone and supersede PMMA as void fillers. Cements that are resorbable can be tailored to provide sufficient rigidity to allow bone healing and retain mechanical strength for a period of time. Subsequently the cement undergoes degradation and is eventually replaced by the host bone. Another advantage of using cements is the possibility of early weight bearing. The advantage of cementing screws is the intimate screw-cement interface, which increases the holding power. An innovative screw design which facilitates PMMA augmentation is the ported screw. Bone cement can be injected into the screw shaft and then flows via side holes into the surrounding bone. The holding power was 278% greater than the holding power of a standard screw