中华创伤杂志
中華創傷雜誌
중화창상잡지
Chinese Journal of Traumatology
2012年
11期
1026-1031
,共6页
吴亚俊%朱悦%郝玉琳%赵卫东
吳亞俊%硃悅%郝玉琳%趙衛東
오아준%주열%학옥림%조위동
腰椎%生物力学%动态稳定%钛合金
腰椎%生物力學%動態穩定%鈦閤金
요추%생물역학%동태은정%태합금
Lumbar vertebrae%Biomechanics%Dynamic stabilization%Titanium alloy
目的 研究新型腰椎动态内固定系统(dynamic internal fixation system,DIFS)对腰椎节段稳定性和椎间盘内压力的影响.方法 收集8具新鲜小牛腰椎标本,制作测试模型,在屈伸、侧屈和旋转方向上加载8N·m的纯力矩进行测试.测试的状态包括完整状态、失稳状态、动态固定状态、半硬性固定状态和坚强固定状态.从第3个循环进行数据的采集,测量相应节段的活动范围、中性区和椎间盘内压力.结果 失稳模型明显地增加了节段在三个运动平面的活动范围和中性区,对椎间盘内压力没有明显影响.三种内固定系统均对失稳节段有稳定作用和承载作用,其中DIFS在前屈、后伸、侧屈和旋转方向上分别将活动范围恢复至完整状态水平的77％、60％、61％和70％,在侧屈、旋转和前屈方向上分别承载椎间盘负荷的45％、29％和40％,但在后伸方向上承载了全部的椎间盘负荷.测试状态对邻近节段的稳定性和椎间盘内压力没有明显影响.结论 DIFS能较好地恢复失稳节段的活动性,并且在多个方向上承载适当的椎间盘负荷.
目的 研究新型腰椎動態內固定繫統(dynamic internal fixation system,DIFS)對腰椎節段穩定性和椎間盤內壓力的影響.方法 收集8具新鮮小牛腰椎標本,製作測試模型,在屈伸、側屈和鏇轉方嚮上加載8N·m的純力矩進行測試.測試的狀態包括完整狀態、失穩狀態、動態固定狀態、半硬性固定狀態和堅彊固定狀態.從第3箇循環進行數據的採集,測量相應節段的活動範圍、中性區和椎間盤內壓力.結果 失穩模型明顯地增加瞭節段在三箇運動平麵的活動範圍和中性區,對椎間盤內壓力沒有明顯影響.三種內固定繫統均對失穩節段有穩定作用和承載作用,其中DIFS在前屈、後伸、側屈和鏇轉方嚮上分彆將活動範圍恢複至完整狀態水平的77％、60％、61％和70％,在側屈、鏇轉和前屈方嚮上分彆承載椎間盤負荷的45％、29％和40％,但在後伸方嚮上承載瞭全部的椎間盤負荷.測試狀態對鄰近節段的穩定性和椎間盤內壓力沒有明顯影響.結論 DIFS能較好地恢複失穩節段的活動性,併且在多箇方嚮上承載適噹的椎間盤負荷.
목적 연구신형요추동태내고정계통(dynamic internal fixation system,DIFS)대요추절단은정성화추간반내압력적영향.방법 수집8구신선소우요추표본,제작측시모형,재굴신、측굴화선전방향상가재8N·m적순력구진행측시.측시적상태포괄완정상태、실은상태、동태고정상태、반경성고정상태화견강고정상태.종제3개순배진행수거적채집,측량상응절단적활동범위、중성구화추간반내압력.결과 실은모형명현지증가료절단재삼개운동평면적활동범위화중성구,대추간반내압력몰유명현영향.삼충내고정계통균대실은절단유은정작용화승재작용,기중DIFS재전굴、후신、측굴화선전방향상분별장활동범위회복지완정상태수평적77％、60％、61％화70％,재측굴、선전화전굴방향상분별승재추간반부하적45％、29％화40％,단재후신방향상승재료전부적추간반부하.측시상태대린근절단적은정성화추간반내압력몰유명현영향.결론 DIFS능교호지회복실은절단적활동성,병차재다개방향상승재괄당적추간반부하.
Objective To investigate effect of a new lumbar dynamic internal fixation system(DIFS)on the stability and intradiscal pressure of lumbar segment.Methods Eight fresh calf lumbar specimens were collected to build test models,which were loaded with pure moments of 8 N·m in flexion/extension,lateral bending,and rotation planes.The test states included intactness,destabilization,dynamic fixation,semi-rigid fixation,and solid fixation.The data were collected from the third loading cycle to determine range of motion and neutral zone of corresponding segments,and the intradiscal pressure.Results Destabilization significantly increased segmental range of motion and neutral zone in three motion planes without obvious influence on intradiscal pressure.The three fixation systems were all able to stabilize and load destabilizing segments.DIFS restored the range of motion of unstable segment to 77％,60％,61％ and 70％ of the intact level in anterior flexion,posterior extension,lateral bending and rotation planes.Meanwhile,DIFS bore 45％,29％ and 40％ of tbe intradiscal load in lateral bending,rotation and flexion directions,but 100％ of the intradiscal load in back extension.The stability and intradiscal pressure of adjacent segments were not affected by the test states.Conclusion DIFS can effectively restore range of motion of unstable segments and share appropriate intradiscal load in most directions.
