Binding mechanism of interface of porous coated titanium alloy prostheses

ＢｉｎｄｉｎｇｍｅｃｈａｎｉｓｍｏｆｉｎｔｅｒｆａｃｅｏｆｐｏｒｏｕｓｃｏａｔｅｄｔｉｔａｎｉｕｍａｌｌｏｙｐｒｏｓｔｈｅｓｅｓＺｏｕＨｏｎｇｅｎ（邹宏思）；ＹｅＪｕｎ（叶军）；ＴａｎｇＮｏｎｇｘｕａｎ（唐农轩）；ＹｕａｎＣｕｎｈｕａ（袁存华）（Ｄｅ...

Binding mechanism of interface of porous coated titanium alloy prostheses

In the experiment, we inserted the implants coated with TC4 fibers and particles into the bones of dogs.The histological characters of the bone ingrowth and the state of bone remodelling at interface were observed. And then the whole course of the fatigue injuries accumulation at the interface was monitored by scanning electron microscopy equipped with fatigue stage. Experiments show that the collagen fibers of bone interweave in the porosity of implants, which were strengthened by hydroxyapatite crystal. The collagen fibers were bound to the porous layer implant and the binding strength was enhanced by hydroxyapatite crystal. The remodelling state of bone in pores of implant and around the interface play a key role in determining the fatigue strength and the life span of the interface between bone and implant. Therefore, we consider that the interlocking fixation between bone and implant can be more exactly explained as binding mechanism.