- 期刊
Mechanics of Reduction of Intracanal Fragments of Thoracolumbar Burst Fractures
胸腰椎爆裂型骨折之脊椎腔內骨碎片之復位機轉
摘要
以六具年輕的屍體脊椎造成爆裂型骨折，再以多種脊椎內植入物復位以決定何種復位力量為復位脊椎腔內骨碎片所必需的，三種脊椎內植入物用以復位脊椎骨折，其中FI及RF可提供撐張及腰椎前曲之復位，Steffee只提供撐張復位力。骨位前、骨折後及復位後均以X光片及電腦斷層掃描加以紀錄。結果RF系統因可有效的提供均勻的前曲撐張力，可恆常的恢復前曲彎度及脊椎體高度，而可增加脊椎腔面積最多；FI系統因提供不穩定的前曲撐張力，而不穩定的恢復脊椎前曲彎度，只能恢復中等程度的脊椎腔面積，Steffee系統因只能提供撐張力以恢復良好的脊椎體高度，不能恢復脊椎前曲彎度，故脊椎腔減壓之能力最少。實驗之結果確定均勻的三脊柱前曲撐張力可獲得最好的脊椎腔內骨碎片復位。
關鍵字
無資料並列摘要
Burst fractures were created in six young cadaveric spines and reduced by spinal instrumentations to determine what reduction forces were necessary for reduction of intracanal fragments of thoracolumbar burst fractures. There pedicle screw devices were applied to the speciment following the commonly accepted clinical technique for each device. The FI (Fixateur Interne) and the RF (Reduction-Fixation) provided both distraction and lordosis. The Steffee device only provided distraction. Plain X-rays and CT scans were taken for the specimens before and after creation of the fractures and following application of the three devices. The RF provided symmetric lordotic distraction efficiently, restored pre-fractured lordosis along with body height constantly, and increased canal area most. The FI provided variable lordotic distraction, restored variable lordosis and increased moderate canal area. The Steffee device provided excellent distraction to restore the vertebral body height but did not create lordosis and decreased canal compromise least. The results confirmed the need for symmetric 3 column lordtic distraction of the disc space and vertebral body to obtain the best possible reduction of intracanal fragments by posterior instrumentations.
延伸閱讀
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