[Repair of bone defect with compound of coralline hydroxyapatite porous, fibrin sealant and Staphylococcus aureus injection].
OBJECTIVE
To investigate the ability of repairing bone defect with the compound of coralline hydroxyapatite porous (CHAP), fibrin sealant(FS) and staphylococcus aureus injection (SAI), and the feasibility to use the compounds as bone substitute material.


METHODS
The animal model of bone defect was made on the bilateral radius of 54 New Zealand white rabbits, which were randomly divided into the experimental group(the defect was repaired with CHAP-FS-SAI), control group(with autograft) and blank control group(the defect was left unrepaired) with 18 rabbits in each group. The ability of bone defect repair was evaluated by gross observation, histopathological study, X-ray and biomechanical analysis 2, 4, 8 and 12 weeks after repair.


RESULTS
(1) In the 2nd week, tight fibro-connection could be found between the implant and fracture site and there were many fibroblasts and capillary proliferation with many chondrocytes around CHAP in the experimental group, while only a few callus formed, and chondrocytes, osteoblast and osteoclast existed in the control group. (2) In experimental group and control group, a large quantity of callus was found 4 and 8 weeks; ossification of chondrocytes with weave bone formation were found 4 weeks and many osteocytes and weave bones and laminar bones were found 8 weeks. (3) In the 12th week, the complete ossification of implant with well bone remodeling, a large number of mature osteocytes and laminar were found in experimental group and control group, and CHAP still existed in the experimental group; the defect area filled with fibro-scar tissue and only many fibroblasts could be seen in blank control group. (4) X-ray findings were the following: In experimental and control groups, callus formation could be seen 2 weeks postoperatively, more callus formed 4 weeks, the bone defect area disappeared and CHAP scattered in the callus 8 weeks; the fracture line disappeared and medullary cavity became united (in control group); and in the 12th week, the cortex became continuous, the medullary cavity became united, and remodeling completed, while bone defect was not still united in blank control group. The maximal torque and torsional stiffness in the experimental group is higher than those in the control group 2 weeks (P < 0.05), but there was no significant difference (P > 0.05) between the two groups 4, 8, 12 weeks after repair.


CONCLUSIONS
The compound of CHAP-FS-SAI has good biological compatibility, and it can be used for one kind of bone substitute material to repair the bone defect.
Wei
Zheng-chao
ZC
Department of Orthopedic Surgery, 3rd Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, P. R. China 510630.
Cai
Dao-zhang
DZ
Zhang
Jun-feng
JF
D000818:Animals; D001672:Biocompatible Materials; D001861:Bone Regeneration; D018786:Bone Substitutes; D002516:Ceramics / Q000627:therapeutic use*; D005260:Female; D015718:Fibrin Tissue Adhesive / Q000627:therapeutic use*; D006882:Hydroxyapatites / Q000627:therapeutic use*; D008297:Male; D016062:Porosity; D011817:Rabbits; D011884:Radius / Q000293:injuries* / Q000601:surgery; D011897:Random Allocation; D013211:Staphylococcus aureus
D001672:Biocompatible Materials; D018786:Bone Substitutes; D015718:Fibrin Tissue Adhesive; D006882:Hydroxyapatites; C119955:coralline hydroxyapatite