摘要
目的探讨新型儿童股骨颈系统(NP-FNS)固定带游离骨块的儿童股骨颈骨折的生物力学性能。方法将10个Sawbones模型骨随机分成A、B两组(n=5),全部制作成Pauwels角为70°的DelbetⅡ型股骨颈骨折模型,在骨折近端底部移除一个游离骨块,模拟带游离骨块的股骨颈骨折。A组模型采用传统倒三角形空心钉固定,B组模型采用NP-FNS固定。将两组模型放置在电子液压力学实验测试机上,每个标本依次进行静态轴向压缩试验、抗扭转试验和循环载荷试验。记录并比较两组标本的轴向压缩刚度、扭转刚度和最大位移差值。结果B组模型的轴向压缩刚度[(321.718±5.770)N/mm]和扭转刚度[(1.448±0.079)N·m/°]显著强于A组模型[(266.722±4.788)N/mm、(1.282±0.023)N·m/°],差异均有统计学意义(P<0.05)。B组模型的循环载荷试验最大位移差值为(0.063±0.038)mm,显著小于A组模型[(0.117±0.056)mm],差异也有统计学意义(P<0.05)。结论与传统倒三角形空心钉固定相比,NP-FNS固定带游离骨块的儿童股骨颈骨折具有更好的生物力学稳定性。
Objective To investigate the biomechanical properties of a new pediatric femoral neck system in the fixation of pediatric femoral neck fractures with a free fracture fragment.Methods Ten Sawbones model bones were randomly divided into 2 even groups(n=5),all of which were made into Delbet TypeⅡfemoral neck fractures with a Pauwels angle of 70°.A free bone block was removed from the bottom at the proximal end of the fracture to simulate a femoral neck fracture with a free fragment.Group A were fixed with traditional inverted triangle cannulated screws,and group B with a new pediatric femoral neck system.After the 2 groups of specimens were placed on a biomechanical testing machine,each specimen was subjected to a static axial compression test,an anti-torsion test and a cyclic load test in turn.The biomechanical results were compared between groups A and B in aspects of axial compression stiffness,torsional stiffness and maximum displacement difference.Results The axial compression stiffness[(321.718±5.770)N/mm]and torsional rigidity[(1.448±0.079)N·m/°]in group B were significantly higher than those in group A[(266.722±4.788)N/mm and(1.282±0.023)N·m/°](P<0.05).The maximum displacement difference in the cyclic load test in group B[(0.063±0.038)mm]was also significantly smaller than that in group A[(0.117±0.056)mm](P<0.05).Conclusion In fixation of pediatric femoral neck fractures with a free fracture fragment,the new pediatric femoral neck system can lead to better biomechanical stability than the traditional inverted triangle cannulated screws.
作者
陈晋宸
黄殿华
卢育南
陈添来
宁毓伟
陈顺有
Chen Jinchen;Huang Dianhua;Lu Yunan;Chen Tianlai;Ning Yuwei;Chen Shunyou(Department of Pediatric Orthopaedics,The Second Hospital of Fuzhou,Clinical Research Center of Emergency and Rehabilitation in Orthopedics&Traumatology in Fujian Province,Fuzhou 350007,China)
出处
《中华创伤骨科杂志》
CAS
CSCD
北大核心
2023年第12期1074-1078,共5页
Chinese Journal of Orthopaedic Trauma
基金
福建省创伤骨科急救与康复临床医学研究中心经费资助(2020Y2014)
福建省临床重点专科经费资助(20220104)
福州市科技计划项目(2020-WS-98)。
关键词
股骨颈骨折
骨折固定术
内
内固定器
生物力学
游离骨块
Femoral neck fractures
Fracture fixation,internal
Internal fixators
Biomechanics
Free fracture fragments
