The average follow up was 24 months, solid fusion was obtained and the fusiontime was 4.2 months in average.
术后随访平均24个月，植骨节段全部融合，融合时间平均为4.2个月。
2
Firstly, how PCF's air-hole structures varied along with the applied fusion power was observed by changing fusion parameters, such as fusiontime and current.
Using biomechanical test, to examine its change at different fusiontime which will offer basic information for its further development and clinical application.