改良空心釘系統(tǒng)治療Pauwels Ⅲ型兒童股骨頸骨折的生物力學分析

高連云　陳少堅　陳雁華　吳濤華　阮康明　劉清平

[關鍵詞] 兒童股骨頸骨折;空心釘;鎖定實心栓;生物力學;骨折內固定

[中圖分類號] R687.3? ? ? ? ? [文獻標識碼] B? ? ? ? ? [文章編號] 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