Abstract:

Objective: To investigate a simple and effective method of evaluating the fat graft survival rate after transplantation, and to provide the objective basis for the clinicians to select the dose of rejection.Methods: A total of 60 cases underwent facial autologous fat granule injection transplantation and needed reinjection were selected. They were divided into observation group and control group (n=30) according to the treatment order. The changes of fat volume or the thickness of subcutaneous tissue in transplantation area of the subjects in observation group were measured by high frequency ultrasound one week and three months after operation, the fat graft survival rate after transplantation was calculated, and the reinjection dose was determined by the fat graft survival rate after one-stage operation. In control group, the reinjection dose was on the basis of the amount of fat needed to be over corrected 40% determined by the doctor's experience. The operation effect questionnaire was filled out by the operator, the patients and the third party 3 months after reinjection; combined with the ultrasound examination results, the results of the satisfaction rate of the subjects were compared between two groups.Results: In observation group, 30 cases were able to identify the range of fat graft, in which the volumes of 39 parts could be calculated by measuring the length, width and thickness of the grafts; the thickness of soft tissue of subcutaneous tissue in transplantation area of 20 parts with large transplantation area was recorded,and the survival rates was 52%-80% which was calculated by the changes of the fat volume or the thickness of graft, and the reinjection dose was selected according to the survival rate of fat transplantation. 1 case of fat transplantation appeared induration in observation group, 3 cases in control group, and 1 case presented cyst 3 months after reinjection. The total satisfaction rate after operation in observation group was 91.7%, and the total satisfaction rate after operation in control group was 80.0%; the difference was significant(P>0.05).Conclusion: High frequency ultrasound is a simple and effective method to evaluate the survival rate of transplanted fat, and it can improve the satisfaction of reinjection.

Key words: survival rate, reinjection, high frequency ultrasound, fat transplantation