微创颈椎管成形术椎管容积变化实验及临床研究
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摘要
背景和目的
     脊髓型颈椎病(cervical spondylotic myelopathy, CSM)是指以颈椎间盘退变为基础,在此基础上出现椎间盘突出、椎体后缘骨赘、后纵韧带骨化、小关节退变增生、黄韧带增生钙化等,以上一种或几种因素共同参与导致颈椎管狭窄,造成脊髓或脊髓周围血管受压,最终导致不同程度的脊髓神经功能障碍。临床主要表现为颈肩部不适、肢体麻木、躯干“束带”感、行走不稳、双下肢踩棉花感、腱反射亢进、肌肉萎缩等,严重者可导致瘫痪。CSM是最严重的一类颈椎病,占颈椎病的5%-10%,好发于50岁以上的老年人,其发病隐匿,临床上极少数处于长期稳定阶段,70-80%表现为慢性进行性恶化,致残率极高,是威胁老年患者身体健康的常见疾病。因此多主张在脊髓功能出现不可逆性损伤之前采取积极治疗措施。多数学者认为自发病起3-6个月内治疗,可获得较好的脊髓功能恢复,病程越短效果越好。
     目前,CSM治疗方法很多,从病情轻重考虑,可分为非手术治疗和手术治疗;从手术入路可分为颈前路和颈后路手术,由于CSM的临床表现个体差异较大,目前对该病的治疗各执己见,尤其是多阶段CSM。目前对多节段CSM的治疗采取颈后路手术的占多数。即可直接处理后面的黄韧带增厚、小关节增生等致压因素,而且可通过扩大椎管,使脊髓利用“弓弦”原理后移,间接处理脊髓前方的压迫。
     后路手术包括全椎板或半椎板切除术、椎管扩大成形术,后路椎板切除术由于破坏了椎板、小关节等重要结构,颈椎管完整性丧失,术后颈椎不稳、反曲畸形、医源性压迫等并发症发生率高,目前已基本被椎管扩大成形术所替代。
     单开门和双开门颈椎管扩大成形术是目前治疗多节段脊髓型颈椎病的主要方法,但它们均存在棘突韧带复合体等结构破坏大甚至完全切除、可能影响疗效的问题。故我们提出微创颈椎管成形术,观察其椎管容积扩大情况,分析减压效果及临床疗效。
     方法
     选取12个完整颈5椎骨干燥标本模拟微创颈椎管成形术,采取手术前后自身对照方法,分为对照组和实验组(包括双侧椎板“长槽状”切开、棘突及椎板整体均匀后移1mm组、2mm组、3mm组,共三组)。手术前后采用螺旋CT薄层扫描,并在CT后处理工作站利用3D测量工具分别测量各组完整骨性椎管容积。
     2010年9月-2011年9月,36例脊髓型颈椎病患者在我科行微创颈椎管成形术。按照日本矫形外科学会JOA评分法,自身对照评价术前、术后脊髓神经功能恢复情况。
     结果
     对照组12个颈5椎骨标本的椎管容积平均为1592±331mm3,后移1、2、3mm组的骨性椎管容积分别平均为1727±357mm3、1861±386mm3、2001±416mm3;容积改善率分别为8.53±1.05%、16.93±1.78%、25.75±2.97%;后移2mm组与后移1mm组相比,p<0.05,有统计学意义;后移3mm组与后移2mm组相比,后移3mm组与后移1mm组相比p<0.05,有统计学意义。36例患者手术时间平均为75分钟(50-105),出血量平均为375mL(300-450),术前JOA评分7.97±1.73,末次随访时JOA评分13.14±1.74,p<0.05,有统计学意义,JOA评分平均改善率58.55±13.71%,优良率为83.3%(优9例,良21例,一般6例)。
     结论
     标本模拟可较好反映微创颈椎管成形术的椎管容积变化,为其临床实现有效减压提供可靠的指导依据。
BACKGROUND AND OBJECTIVE
     Cervical spondylotic myelopathy (CSM) is based on the cervical intervertebral disc degeneration, on this basis, appear the cervical intervertebral disc herniation、 vertebral rear osteophyte、posterior longitudinal ligament ossification、 facet joint degeneration and hyperplasia、 yellow ligament hyperplasia ossification and so on. More than one or several factors participate in the cervical spinal canal stenosis, causeed the blood vessel that around spinal cord or spinal cord compression, eventually lead to different degrees of spinal cord and nerve dysfunction。 The main Clinical manifestations of CSM are the neck and shoulder discomfort、numbness、 trunk"belted"sense、 walking instability、 the lower limbs feeling stepped on cotton、 tendon reflex hyperfuncion、 muscle atrophy, even severe cases can lead to paralysis。 CSM is the most serious type of cervical spondylosis, accord for5%-10%of cervical spondylosis, occurs in the olderly people over50, its incidence of occult, clinically rare in a long-term stable phase,70-80%of the performance was chronic
     progressive deterioration, and with high morbidity, is threatening the health of elderly patients with common diseases,Therefore, many advocate aggressive treatment measures before irreversible damage in the spinal cord function。 Most scholars believe that within three to six months onset of treatment, can achieve good spinal cord function recovery,the short course of the disease, the better results。
     At present, there are many theropy methods about CSM,consider with the disease severity, can be divided into non-surgical therapy and operation therapy; from the surgical approach, can be divided into cervical anterior and posterior treatment。 Due to individual difference in the clinical manifestations of the CSM,each hold their own views on the treatment of the disease, especially in multilevel CSM,current treatment multiple segmental CSM to majority of cervical posterior approach。 Can directly deal with compression factors such as the yellow ligament thickening、 small joint hyperplasia and so on, but also by expanding vertebral canal, so the spinal cord backward use "bowstring"principle.to indirect deal with the front compression factors of spinal cord.posterior surgery including laminectomy or semi-lainectomy、 laminoplasty, posterior laminectomy due to damage the important structure of cervical such as lamina、facet joint, the Integrity of cervical spinal canal loss, lead to high incidence of postoperateive complications, like cervical instability、 deformity of Inflection、iatrogenic oppression。At present laminectomy has been replaced by cervical laminoplasty.
     single-door and double-door of posterior cervical laminopalsry are now the main methods to treat cervical spondylotic myelopathy(CSM),but they all have the same question that with the spinous process ligament complex damaged, even completely resected and affect the curative effect. So we puts forword cervical minimally invasive laminoplasty, to observe the canal volume expansion and analyse the effect of decompression and curative effect.
     METHODS
     took12dry specimens of the fifth cervical vertebra to simulate cervical minimally invasive laminoplasty, self-control before and after surgerys, divided into control and experimental groups (including three groups that with bilateral plate long strip slotted、spinous and vertebral plate retruded by1mm、2mm、3mm), the specimens were thin-slice scanned with spiral CT,measured the volume of bony cervical canal with the3D tools in CT workstation respectively.
     Selected46CSM patients received cervical minimally invasive laminoplasty from9th2010to9th2011in our department,.according toJapanese Orthopaedic Association (JOA) scoring system, neurologic function were evaluated before and after surgery through self-control.
     RESULTS
     about the12dry specimens of the fifth cervical vertebra, average cervical bony spinal canal volume of their the control group was1592±331mm3,,average cervical bony spinal canal volume of concessions1mm、2mm、3mm were respective1727±357mm3、1861、386mm3、2001±416mm3;the improvement rate of the capacity were respective8.53、1.05%、16.93±1.78%、25.75±2.97%, the concessions2mm group compared with lmm group, p<0.05,it had the statistical significance,the3mm group compared with the2mm group, p<0.05,it had the statistical significance,the3mm group compared with the lmm group, p<0.05,it had the statistical significance, patiens group:the average surgery time was75minutes (50-105),and the average amount of bleeding was375ml (300-450),the JOA score was7.97±1.73before surgery and was13.14±1.74in final followed-up,the JOA score improvement rate was58.55±13.71%,the excellent and good rates were obtained in83.3%(9excellent,21good,6fair). Specimens simulation can better reflect the spinal canal volume of cervical minimally invasive lamionplasty, provides a reliable basis for guiding effective decompression.
     CONCLUSION
     Specimens simulation can better reflect the spinal canal volume of cervical minimally invasive lamionplasty, provides a reliable basis for guiding effective decompression.
引文
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