中华创伤骨科杂志
中華創傷骨科雜誌
중화창상골과잡지
CHINESE JOURNAL OF ORTHOPAEDIC TRAUMA
2012年
7期
595-598
,共4页
胸椎%腰椎%骨折%骨钉%生物力学
胸椎%腰椎%骨摺%骨釘%生物力學
흉추%요추%골절%골정%생물역학
Thoracic vertebra%Lumbar vertebra%Fractures%bone%Bone nails%Biomechanics
目的 评价经皮长U形空心椎弓根钉系统内固定治疗胸腰椎骨折的生物力学性能.方法 采集成年新鲜胸腰椎标本8具,平均分为普通椎弓根钉组和长U形空心椎弓根钉组,每组4具标本.制作椎体前屈压缩性骨折,分别采用普通椎弓根钉和长U形空心椎弓根钉固定治疗,利用生物力学的电测试验应力分析方法测试固定后脊柱的极限压缩强度、轴向压缩刚度、弯曲刚度、扭矩和扭转刚度.结果 普通椎弓根钉组和长U形空心椎弓根钉组的平均极限压缩强度分别为(3450.02±110.03)、(3430.04±102.12) MPa,平均轴向压缩刚度分别为(407.52±33.02)、(395.04±26.46)N/mm,平均弯曲刚度分别为(305.14±26.53)、(295.12±23.80)N·em/Deg,平均扭矩分别为(6.45±0.25)、(6.25±0.21)N·m,平均扭转刚度分别为(0.54±0.04)、(0.52±0.03)N·cm/Deg,以上项目两组间比较差异均无统计学意义(P＞ 0.05).结论 长U形空心椎弓根钉系统内固定胸腰椎骨折术后的生物力学性能与普通椎弓根螺钉接近,能满足骨折愈合的生物力学要求.
目的 評價經皮長U形空心椎弓根釘繫統內固定治療胸腰椎骨摺的生物力學性能.方法 採集成年新鮮胸腰椎標本8具,平均分為普通椎弓根釘組和長U形空心椎弓根釘組,每組4具標本.製作椎體前屈壓縮性骨摺,分彆採用普通椎弓根釘和長U形空心椎弓根釘固定治療,利用生物力學的電測試驗應力分析方法測試固定後脊柱的極限壓縮彊度、軸嚮壓縮剛度、彎麯剛度、扭矩和扭轉剛度.結果 普通椎弓根釘組和長U形空心椎弓根釘組的平均極限壓縮彊度分彆為(3450.02±110.03)、(3430.04±102.12) MPa,平均軸嚮壓縮剛度分彆為(407.52±33.02)、(395.04±26.46)N/mm,平均彎麯剛度分彆為(305.14±26.53)、(295.12±23.80)N·em/Deg,平均扭矩分彆為(6.45±0.25)、(6.25±0.21)N·m,平均扭轉剛度分彆為(0.54±0.04)、(0.52±0.03)N·cm/Deg,以上項目兩組間比較差異均無統計學意義(P＞ 0.05).結論 長U形空心椎弓根釘繫統內固定胸腰椎骨摺術後的生物力學性能與普通椎弓根螺釘接近,能滿足骨摺愈閤的生物力學要求.
목적 평개경피장U형공심추궁근정계통내고정치료흉요추골절적생물역학성능.방법 채집성년신선흉요추표본8구,평균분위보통추궁근정조화장U형공심추궁근정조,매조4구표본.제작추체전굴압축성골절,분별채용보통추궁근정화장U형공심추궁근정고정치료,이용생물역학적전측시험응력분석방법측시고정후척주적겁한압축강도、축향압축강도、만곡강도、뉴구화뉴전강도.결과 보통추궁근정조화장U형공심추궁근정조적평균겁한압축강도분별위(3450.02±110.03)、(3430.04±102.12) MPa,평균축향압축강도분별위(407.52±33.02)、(395.04±26.46)N/mm,평균만곡강도분별위(305.14±26.53)、(295.12±23.80)N·em/Deg,평균뉴구분별위(6.45±0.25)、(6.25±0.21)N·m,평균뉴전강도분별위(0.54±0.04)、(0.52±0.03)N·cm/Deg,이상항목량조간비교차이균무통계학의의(P＞ 0.05).결론 장U형공심추궁근정계통내고정흉요추골절술후적생물역학성능여보통추궁근라정접근,능만족골절유합적생물역학요구.
Objective To evaluate the biomechanical characteristics of the long U-shaped hollow pedicle screw system for percutaneous fixation of thoracolumbar fractures.Methods Models of vertebral compression fracture were created by flexion in 8 fresh cadaveric samples of thoracolumbar spine.The models were divided into 2 equal groups according to the fixation system applied.In group A conventional pedicle screws were used while in group B long U-shaped hollow pedicle screws were used.The yield compressive strength,axial compression stiffness,bending stiffness,torque and torsional stiffness of all the fixated spines in the 2 groups were tested by the bio-mechanical electrical measurement and compared as well.Results The conventional pedicle screws and long U-shaped hollow pedicle screws showed no significant differences regarding yield compressive strength (3450.02 ± 110.03 MPa vs.3430.04 ± 102.12 MPa),axial compressionstiffness (407.52 ± 33.02 N/mm vs.395.04 ± 26.46 N/mm),bending stiffness (305.14 ± 26.53 N · cm/Degvs.295.12±23.80 N · cm/Deg),torque (6.45±0.25 N · m vs.6.25±0.21 N · m) or torsional stiffness (0.54±0.04N·cm/Degvs.0.52±0.03N·cm/Deg) (P＞ 0.05).Conclusion The long U-shaped hollow pedicle screw system can satisfy the biomechanical requirements for fixation of thoracolumbar fractures and can function as well as the conventional pedicle screw system.
