改良空心钉系统治疗Pauwels Ⅲ型儿童股骨颈骨折的生物力学分析

高连云　陈少坚　陈雁华　吴涛华　阮康明　刘清平

[關键词] 儿童股骨颈骨折;空心钉;锁定实心栓;生物力学;骨折内固定

[中图分类号] R687.3          [文献标识码] B          [文章编号] 1673-9701（2021）22-0077-05

Biomechanical analysis of modified cannulated screw system for treatment of Pauwels type III femoral neck fracture in children

GAO Lianyun   CHEN Shaojian   CHEN Yanhua   WU Taohua   RUAN Kangming   LIU Qingping

Orthopedics Division 5 （Department of Trauma， Pediatric Orthopedics）， Mindong Hospital Affiliated to Fujian Medical University， Fujian， Fu'an   355000， China

[Abstract] Objective To investigate the biomechanical properties of modified cannulated screw system with locking solid bolt in the treatment of Pauwels III type femoral neck fracture in children. Methods Forty artificial bone specimens were numbered and randomly divided into group A， group B， group C and group D （n=10）. Pauwels III model of femoral neck fracture in children （Pauwels 70°） was made for anatomic reduction of fracture specimens. Group A was fixed with 2 traditional cannulated screws; group B was fixed with 2 cannulated screws with improved matching and locking solid bolts; group C was fixed with 3 traditional cannulated screws; group D was fixed with 3 cannulated screws with improved matching and locking solid bolts. After the fixation， biomechanical tests were conducted. The axial compression stiffness， cyclic load displacement， ultimate compression load and ultimate test stiffness of the four groups were compared. Results Statistically significant differences were observed in axial compression stiffness， cyclic load displacement， ultimate compression load and ultimate test stiffness among the four groups of fracture internal fixation models （P<0.05）. Axial compression stiffness： group A （706.30±20.86） N/mmgroup B （0.74±0.05） mm>group C （0.45±0.04） mm>group D （0.35±0.03） mm; ultimate compression load： group A （1517.80±39.30） N