Pedicle Screw Fixation with Kyphoplasty Decreases the Fracture Risk of the Treated and Adjacent Non-treated Vertebral Bodies:a Finite Element Analysis

Adjacent vertebral fractures are common in patients with osteoporotic vertebral compression fractures（OVCFs） after kyphoplasty.This finite element study was to examine whether short segment pedicle screw fixation（PSF） with kyphoplasty may decrease the fracture risk of the treated and adjacent non-treated vertebrae after kyphoplasty for OVCFs.By simulating cement augmentation with or without short segment pedicle screw fixation（PSF）,two tridimensional,anatomically detailed finite element models of the T10–L2 functional spinal junction were developed.The insertion of pedicle screws into the intact vertebra apparently decreased the stress distribution of the treated vertebra in vertical compression and other load situations.The stress distribution in the bone structures of the intact vertebra adjacent to the intact-screwed vertebra was much less than that in the one adjacent to the treated vertebra.The insertion of pedicle screws into the intact vertebra greatly decreased the maximum displacement of the cortical bones and cancellous bones of the vertebrae.Our results indicated that short segment PSF with kyphoplasty may decrease the fracture risk of the treated and adjacent non-treated vertebrae in the management of OVCFs.

Comparison of Clinical Outcomes of Cortical Bone Trajectory and Traditional Pedicle Screw Fixation in Posterior Lumbar Interbody Fusion

Posterior lumbar interbody fusion (PLIF) is a common surgical procedure and widely used in the treatment of lumbar degenerative disc disorders. Traditionally, posterior lumbar interbody fusion is done by using the traditional pedicle screw (PS) which offers great advantages, but at the same time it has some disadvantages which include the risk of superior facet joint violation and muscle damage. Recently, an alternative method of screw insertion via cortical bone trajectory (CBT) has been invented which has less invasive process and can be placed without the drawbacks associated with the traditional pedicle screw. However, it has to remain an interest whether CBT will provide similar or greater clinical outcomes compared to PS in PLIF. So the main aim of this review is to compare the clinical outcomes of cortical bone trajectory and traditional pedicle screw fixation in posterior lumbar interbody fusion based on the articles published on this topic. Compared to the traditional pedicle screw fixation, PLIF with CBT has similar clinical outcome based on pain intensity, ODI status and JOA score, as well as similar fusion rate and radiological evaluated complication such as loosening of screw. In addition PLIF with CBT has advantages of less facet joint violation, less blood loss, less intraoperative muscle damage and perioperative pain. On the basis of this study, we can suggest that PLIF with CBT can be considered as a reasonable alternative to PS in PLIF.

Successful outcomes of unilateral vs bilateral pedicle screw fixation for lumbar interbody fusion:A meta-analysis with evidence grading

BACKGROUND Whether it’s better to adopt unilateral pedicle screw(UPS)fixation or to use bilateral pedicle screw(BPS)one for lumbar degenerative diseases is still controversially undetermined.AIM To make a comparison between UPS and BPS fixation as to how they work efficaciously and safely in patients suffering from lumbar degenerative diseases.METHODS We have searched a lot in the databases through 2020 with index terms such as“unilateral pedicle screw fixation”and“bilateral pedicle screw fixation.”Only randomized controlled trials and some prospective cohort studies could be found,yielding 15 studies.The intervention was unilateral pedicle screw fixation;Primarily We’ve got outcomes of complications and fusion rates.Secondarily,we’ve achieved outcomes regarding total blood loss,operative time,as well as length of stay.Softwares were installed and utilized for subgroup analysis,analyzing forest plots,sensitivity,heterogeneity,forest plots,publication bias,and risk of bias.RESULTS Fifteen previous cases of study including 992 participants have been involved in our meta-analysis.UPS had slightly lower effects on fusion rate[relative risk(RR)=0.949,95%CI:0.910 to 0.990,P=0.015],which contributed mostly to this metaanalysis,and similar complication rates(RR=1.140,95%CI:0.792 to 1.640,P=0.481),Δvisual analog scale[standard mean difference(SMD)=0.178,95%CI:-0.021 to 0.378,P=0.080],andΔOswestry disability index(SMD=-0.254,95%CI:-0.820 to 0.329,P=0.402).In contrast,an obvious difference has been observed inΔJapanese Orthopedic Association(JOA)score(SMD=0.305,95%CI:0.046 to 0.563,P=0.021),total blood loss(SMD=-1.586,95%CI:-2.182 to-0.990,P=0.000),operation time(SMD=-2.831,95%CI:-3.753 to-1.909,P=0.000),and length of hospital stay(SMD=-0.614,95%CI:-1.050 to-0.179,P=0.006).CONCLUSION Bilateral fixation is more effective than unilateral fixation regarding fusion rate after lumbar interbody fusion.However,JOA,operation time,total blood loss,as well as length of stay were improved for unilateral fixation.

Investigation of optical reflectance from different animal vertebra along the fixation trajectory of pedicle screw in frequency domain

Accurate placement of pedicle screw(PS)is crucial in spinal surgery.Developing new real-time intra-operative monitoring and navigation methods is an important direction of clinical appli-cation research.In this paper,we studied the spectrum along the fixation trajectory of PS in frequency domain to tackle the accuracy problem.Fresh porcine vertebrae,bovine vertebrae and ovine vertebrae were measured with the near-infrared spectrum(NIR)device to obtain the reflected spectrum from the vertebrae.Along the fixation trajectory of PS,average energy from different groups was calculated and used for identifying different tissues and compared to achieve the optimal recognition factor.Compared with the time domain approach,the frequency domain method could divide the spectra measured at different tissue points into different groups more stably and accurately,which could serve as a new method to assist the PS insertion.The results gained from this study are significant to the development of hi-tech medical instruments with independent intellectual property rights.

Learning curves of robot-assisted pedicle screw fixations based on the cumulative sum test

BACKGROUND In robot-assisted(RA)spine surgery,the relationship between the surgical outcome and the learning curve remains to be evaluated.AIM To analyze the learning curve of RA pedicle screw fixation(PSF)through fitting the operation time curve based on the cumulative summation method.METHODS RA PSFs that were initially completed by two surgeons at the Beijing Jishuitan Hospital from July 2016 to March 2019 were analyzed retrospectively.Based on the cumulative sum of the operation time,the learning curves of the two surgeons were drawn and fit to polynomial curves.The learning curve was divided into the early and late stages according to the shape of the fitted curve.The operation time and screw accuracy were compared between the stages.RESULTS The turning point of the learning curves from Surgeons A and B appeared in the 18th and 17th cases,respectively.The operation time[150(128,188)min vs 120(105,150)min,P=0.002]and the screw accuracy(87.50%vs 96.30%,P=0.026)of RA surgeries performed by Surgeon A were significantly improved after he completed 18 cases.In the case of Surgeon B,the operation time(177.35±28.18 min vs 150.00±34.64 min,P=0.024)was significantly reduced,and the screw accuracy(91.18%vs 96.15%,P=0.475)was slightly improved after the surgeon completed 17 RA surgeries.CONCLUSION After completing 17 to 18 cases of RA PSFs,surgeons can pass the learning phase of RA technology.The operation time is reduced afterward,and the screw accuracy shows a trend of improvement.

Treatment of Anderson Type II Odontoid Fracture in Elderly Patients by Posterior Pedicle Screw Fixation Combined with Iliac Bone Grafting

Objectives: To explore the treatment and related prognosis of elderly patients with Anderson II odontoid fracture with posterior pedicle screw fixation combined with iliac bone grafting. Methods: Retrospective analysis of 17 cases of elderly patients with Anderson II odontoid fracture who underwent posterior pedicle screw fixation combined with iliac bone grafting from January 2013 to December 2016. 17 patients had a history of trauma before surgery, and they all have varying degrees of atlantoaxial instability or subluxation and varying degrees of neck occipital pain and limited mobility. Result: No spinal cord or vertebral artery injury occurred during surgery. Follow-up information is complete. The follow-up period was 6 to 48 months (mean 27.4 ± 12.4 months). Postoperative imaging review prompted a good reduction of cervical spine, stable sequence;no pedicle screw loosening, fracture, iliac bone graft at the location of the situation, odontoid fracture and bone healing at the good, the patient after cervical rotation are limited to varying degrees. Conclusion: Posterior pedicle screw fixation combined with iliac bone grafting in elderly patients with Anderson II odontoid fracture can achieve good stability, and the prognosis is good, but long-term cervical rotation function may be affected to varying degrees.

Evaluation of Percutaneous Pedicle Screw Fixation in Patients with Pyogenic Spondylitis of the Thoracolumbar Spine

Background: Basic principle for the treatment of pyogenic spondylitis (PS) is conservative care, but surgical intervention is often required when conservative treatment may fail. We have experienced many conservative cases of various complications due to long-term bed rest and poor pain control. Recently we have adopted percutaneous pedicle screw (PPS) fixation for the treatment of PS as a minimally invasive spine stabilization (MISt) fusion to reduce such morbidity of the conservative care. Objective: To evaluate the impact of PPS fixation in patients with PS. Study Design: A retrospective analysis of the medical records. Subjects, Methods: We reviewed 54 consecutive patients who underwent treatment in our hospital for PS during 2005-2018 and observed for more than 12 months. Of those we excluded cases showing effectiveness to initial treatment (it was defined fever relief or C-reactive protein (CRP) inversion in 3 weeks of antibiotics) so that this study is a retrospective study in cases showing initial treatment resistance. Finally, this study included 29 cases. Medical records of these 29 cases were reviewed for baseline, organism isolated and its detection rate, the clinical outcome in 12 months (Discharge, Transfer, Death), the period from the first visit to our hospital to fever relief, CRP inversion, ambulation, and Discharge or Transfer. Results: These cases were divided into two groups, the conservative group (C-group): 17 cases, and the PPS group (P-group): 12 cases. There is no statistically significant difference in fever relief (p = 0.051) and CRP inversion (p = 0.208). The period to ambulation and discharge or transfer was significantly shorter in group P (p = 0.020, p = 0.031). 1-Year survival rate was 92% in the P-group, and 71% in the C-group. There is no statistically significant difference (p = 0.354) between the two groups. The rate of Discharge to home and care facility is 58% in P-group, and 47% in C-group. And the rate of Transfer is 34% in P-group, and 35% in C-group. Conclusion: PPS fixation was effective to achieve shortening the period to ambulation and discharge or transfer. But it was not effective in infection control. This suggests that PPS fixation should be aggressively administered to patients who can expect pain relief and early ambulation by PPS fixation in the patient of PS showing resistance to initial treatment.

Unilateral pedicle screw fixation combined with lumbar interbody fusion for the treatment of lumbar degenerative diseases

Objective To explore the feasibility and efficiency of the treatment of lumbar degenerative diseases after transforaminal lumbar interbody fusion (TLIF) and posterolateral fusion (PLF) procedures in which unilateral pedicle screw fixation was used.

Safety factors for anterior pedicle screw fixation tunnel in axis

Objective To investigate feasibility and safety of anterior pedicle screw fixation tunnel in the axis so as to provide theoretic evidence for further clinical application.Methods Thirty-two dry axis specimens were used foranterior

Atlantoaxial pedicle screw fixation for old odontoid fracture combined with atlantoaxial instability

Objective To explore the clinical effect of the trans-atlantoaxial pedicle screw-rod internal fixation and fusion in treatment of old odontoid fracture combined with atlantoaxial instability. Methods The study involved 48 patients with

Free-hand cervical pedicle screw fixation for upper cervical fracture and instability

Objective To evaluate the clinical effect of the free-hand cervical pedicle screw fixation in treatment of the upper cervical fracture and instability. Methods A retrospective review was performed on 15 patients

The application of C1-C2 pedicle screw internal fixation on the upper cervical diseases of children

Objective To report five cases of puerile (【9 years) atlantoaxial instability which underwent C1-C2 pedicle screw internal fixation by posterior approach,and to introduce the surgical technique and the key point

Clinical application of improved 2D computer-assisted fluoroscopic navigation through simulating a 3D vertebrae image to guide pedicle screw internal fixation

Objective To study the effect of using improved 2D computer-assisted fluoroscopic navigation through simulating 3D vertebrae image to guide pedicle screw internal fixation.Methods Posterior pedicle screw internal fixation,distraction

Effect of vertebroplasty combined with pedicle internal fixation on senile osteoporotic vertebral compression fracture

Objective:To investigate the effect of vertebroplasty combined with pedicle screw fixation in the treatment of senile osteoporotic vertebral compression fractures.Methods:Eighty-one patients with senile osteoporotic vertebral compression fractures were enrolled in our hospital from January 2015 to January 2019.They were randomly divided into a single group(40 cases)and a combined group(41 cases).),a single group was treated with pedicle screw internal fixation,and the combined group was treated with vertebroplasty.The recovery,pain and dysfunction index of the injured vertebrae before and after operation were compared between the two groups.The serum neurological function related indexes before and after operation were compared and the incidence of postoperative adverse events were recorded.Results:There was no significant difference in the recovery of the injured vertebrae between the two groups(P>0.05).The compression ratio,spinal stenosis rate and Cobb angle of the combined group were significantly lower than the single group(P<0.05).On the 3rd postoperative day,there were no significant differences between the two groups in Visual Analogue Scale/Score(VAS)and Oswestry Dability Index(ODI)scores(P>0.05).The VAS and ODI scores of the group were significantly lower than those of the single group(P<0.05).On the 3rd day after surgery,the neuron-specific enolase(NSE)and brain derived neurotrophic factor(brain-derived neurotrophic factor)were used.The levels of BDNF,S100βand Nerve growth factor(NGF)were not significantly different(P>0.05).At 3 months after operation,the level of BDNF in the combined group was significantly higher than that in the single group.The levels of NSE,S100βand NGF were significantly lower than that of the single group.The group(P<0.05);the incidence of adverse events in the combined group was significantly lower than that in the single group(P<0.05).Conclusions:Vertebroplasty combined with pedicle screw fixation for the treatment of senile osteoporotic vertebral compression fracture can effectively improve the recovery of postoperative vertebral body structure,postoperative pain and dysfunction in Jianing patients,improve postoperative neurological function To reduce the incidence of adverse events,with clinical promotion significance.

Posterior Selective Thoracic Fusion in Adolescent Idiopathic Scoliosis Patients:a Comparison of All Pedicle Screws versus Hybrid Instrumentation

Objective To analyze the influence of segmental pedicle screws versus hybrid instrumentation on the correction results in adolescent idiopathic scoliosis patients undergoing posterior selective thoracic fusion. Methods By reviewing the medical records and roentgenograms of adolescent idiopathic scoliosis patients who underwent selective thoracic fusion from February 2000 to January 2007 in our hospital, the patients were divided into 2 groups according to different instrumentation fashions： Group A was hook-screw-rod （hybrid） internal fixation type, Group B was screw-rod （all pedicle screws） internal fixation type, and the screws were used in every segment on the concave side of the thoracic curve. The parameters of the scoliosis were measured and the correction results were analyzed. Results Totally, 48 patients （7 males, 41 females） were included, with an average age of 14.4 years old and a mean follow-up time of 12.3 months. Thirty and 18 patients were assigned to group A and group B, respectively. The mean preoperative coronal Cobb angles of the thoracic curve were 48.8° and 47.4°, respectively. After surgery, they were corrected to 13.7° and 6.8°, respectively. At final follow-up, they were 17.0° and 9.5°, with an average correction rate of 64.6% and 79.0%, respectively, and the correction rate of group B was significantly higher than that of group A （P=0.003）. The mean preoperative coronal Cobb angles of the lumbar curve were 32.6° and 35.2°, respectively. After surgery, they were corrected to 8.6° and 8.3°, respectively. At final follow-up, they were 10.3° and 11.1°, with an average correction rate of 66.8% and 69.9%, respectively, and the correction rate of group B was significantly higher than that of group A （P=0.003）. The correction loss of the thoracic curve and lumbar curve in the 2 groups were 3.1° and 1.8°, 2.4° and 2.4°, respectively. No significant difference was noted （both P〉0.05）. The decompensation rate at final follow-up in these 2 groups were 4% （1/25） and 7.1% （1/14） respectively, with no significant difference （P〉0.05）.

Study on clinical effects of pedicle screw combined with immobilized implantation bone by wirerope and hallow compression screw immobilization in treating spondylolysis of lumbar vertebra of multiple segments of adults

Objective:To observe clinical effects of pedicle screw fixation combined with cable wires and bone graft and cannulated compression screws on adult multi-segment lumbar spondylolysis.Methods:70 cases of patients with multi-segment lumbar spondylolysis were selected in our hospital.According to different surgical schemes,these patients were divided into the observation group(35 cases)and the control group(35 cases).The observation group received pedicle screw fixation combined with cable wires and bone graft and the control group received cannulated compression screw fixation.Macnab criteria were adopted to implement a therapeutic evaluation of two groups of patients to make an observation and comparison of the excellent and good rate of surgery and a series of indicators including perioperative clinical effects,intraoperative blood loss,duration of surgery,hospital length of stay(HLOS),visual analogue scale(VAS),Oswestry disability index and Japanese Orthopaedic Association(JOA)score.Results:The excellent and good rate of the observation group was 97.14%,and that of the control group was 82.86%,the difference between two groups was statistically significant(χ^(2)=6.248,p=0.012).The differences in intraoperative blood loss,duration of surgery and HLOS between two groups were statistically significant(t=-4.55,t=-4.55,t=-4.55;p<0.05).Oswestry index,VAS score and JOA score of the observation group were(2.4±0.9),(28.5±6.4)and(27.1±3.1)respectively,and these of the control group were(3.5±1.2),(37.1±7.8)and(21.3±2.7)respectively,the differences between two groups were statistically significant(t=4.338,t=5.043,t=8.347,p<0.05).Conclusions:Pedicle screw combined with immobilized implantation bone by wirerope has an excellent clinical effect on the treatment of adult multi-segment lumbar spondylolysis,and it has a series of advantages such as fast postoperative recovery,small surgical trauma and so on.In addition,this technique can also restore the stability of spinal segments and relieve pains to a greater degree.

术中CT辅助椎弓根螺钉内固定治疗寰枢椎不稳疗效分析

目的探讨椎弓根螺钉内固定联合术中CT扫描治疗寰枢椎不稳的临床疗效。方法对该院2015年7月~2019年11月采用术中CT辅助后路经寰枢椎椎弓根螺钉内固定结合术治疗的25例寰枢椎不稳患者进行回顾分析,其中22例为寰枢椎不稳或脱位,3例为新鲜的齿状突骨折、脱位;16例患者合并颈脊髓受压症状。22例术中行寰枢椎固定后植骨融合术,3例仅行内固定而未植骨融合。结果25例患者均成功完成手术,寰枢椎各50枚螺钉,术中CT扫描后修正定位针10枚,调整后植入螺钉,术中CT扫描、术后CT重建示螺钉位置均良好;术中、术后均未发现椎动脉、脊髓、神经根损伤等严重并发症发生。术后6个月复查示植骨融合满意,未植骨融合的3例患者均于术后10个月确认骨折愈合后取出内固定物。术后CT重建显示,螺钉位置Gertzbein分级为0级96枚、1级4枚;经Kappa一致性检验,术中CT扫描和术后CT重建显示的螺钉位置Gertzbein分级结果具有非常好的一致性(Kappa=1)。16例合并颈脊髓症状患者的术前JOA评分为(11.3±0.9)分,术后6个月改善为(14.6±0.8)分,术后1年为(15.3±0.8)分,差异有统计学意义(P<0.05)。结论术中CT辅助椎弓根螺钉治疗寰枢椎不稳可以提高置钉的精准性和手术安全性,可以更好地判断寰枢椎复位,取得良好的临床疗效。

经椎旁肌间隙入路与经皮入路椎弓根螺钉内固定治疗无神经症状胸腰椎骨折的疗效比较

目的比较经椎旁肌间隙入路与经皮入路椎弓根螺钉内固定术治疗无神经症状胸腰椎骨折的临床疗效。方法收集2017年2月至2018年10月期间苏州大学附属第一医院收治的59例无神经症状的单节段胸腰椎骨折病人的临床资料,进行回顾性分析,其中男51例,女8例,平均年龄为46.8岁(19~67岁)。均采用椎弓根螺钉内固定手术,24例采用经椎旁肌间隙入路的病人纳入经肌间隙入路组,35例采用经皮入路的病人纳入经皮入路组。比较两组病人的手术相关指标(术中出血量、手术时间、切口总长度、住院总时间、术后下床时间),术前、术后1周及术后6个月的疼痛视觉模拟量表(VAS)评分,术前及术后椎体前缘高度百分比、Cobb角以及螺钉置入精确度。结果病人获得(16.1±4.2)月(12~28个月)随访。经肌间隙入路组的手术时间显著少于经皮入路组[(114.00±48.56)min vs.(153.29±52.46)min],住院总时间显著多于经皮入路组[(12.92±4.97)d vs.(10.40±4.14)d],差异有统计学意义(P<0.05)。两组术后的VAS评分均较术前显著降低,椎体前缘高度百分比均较术前明显增加,术后Cobb角均较术前明显减小,但两组间比较,差异均无统计学意义(P>0.05)。术后经肌间隙入路组的螺钉置入精确度:Ⅰ级128钉,Ⅱ级13钉,Ⅲ级3钉;经皮入路组为:Ⅰ级177钉,Ⅱ级22钉,Ⅲ级1钉,组间差异无统计学意义(P>0.05)。结论经椎旁肌间隙入路与经皮入路椎弓根螺钉内固定术治疗无神经症状的胸腰椎骨折均具有较好的临床疗效,前者在手术时间更有优势,后者在住院总时间更有优势。

椎旁肌间隙入路椎弓根螺钉内固定结合伤椎置钉方案对脊柱骨折患者伤椎恢复及疼痛的影响

目的探究椎旁肌间隙入路椎弓根螺钉内固定结合伤椎置钉方案对脊柱骨折患者伤椎恢复及疼痛的影响。方法选取首都医科大学附属北京安贞医院2021年5月至2023年5月收治的50例脊柱骨折患者。采用抽签法将患者分为对照组和观察组,各25例。对照组采用棘突旁入路椎弓根螺钉内固定联合伤椎置钉治疗;观察组采用椎旁肌间隙入路椎弓根螺钉内固定结合伤椎置钉治疗。比较2组围手术期指标、疼痛度、椎体前缘高度改善状况、Cobb′s角、血清骨代谢指标水平、创伤因子水平。结果观察组术中出血量、手术时间、术后卧床时间、术后引流量、术后住院时间均少于/短于对照组,术后3 d疼痛视觉模拟量表评分低于对照组(均P<0.001)。术后3 d、3个月,观察组椎体前缘高度[(14.0±1.3)cm比(11.7±1.2)cm、(15.4±1.7)cm比(12.8±1.3)cm]、Ⅰ型前胶原氨基端前肽水平均高于对照组,Cobb′s角均小于对照组、Ⅰ型胶原羧基末端肽水平均低于对照组(均P<0.001)。术后3 d,观察组肌红蛋白、乳酸脱氢酶、肌酸激酶水平均低于对照组(均P<0.05)。结论椎弓根螺钉内固定结合伤椎置钉方案中使用椎旁肌间隙入路临床疗效更佳,具有手术切口小、时间短和恢复快的特征,且有助于患者伤椎恢复,减少疼痛,促进骨愈合。

经Wiltse肌间入路长节段内固定联合椎板间有限减压治疗胸腰段爆裂骨折的临床疗效

目的对比经Wiltse肌间入路长节段内固定联合椎板间有限减压与传统入路固定减压治疗胸腰段爆裂骨折的临床疗效。方法选择42例单节段胸腰段爆裂骨折手术患者,依据入路的不同将患者分为经Wiltse肌间入路组(n=20)及传统组(n=22),记录并比较两组患者手术时间、术中出血量等围术期指标;手术前后伤椎椎体前缘高度比和矢状位Cobb角的变化;术前及术后3个月神经功能恢复情况。结果经Wiltse肌间入路组患者的手术时间、术中出血量、术后引流量、术后住院时间、术后VAS评分均优于对照组(P均<0.05)。两组患者术后矢状位Cobb角及伤椎椎体前缘高度均较术前改善(P均<0.05)。两组患者术后3个月Frankel分级比较,差异无统计学意义(P>0.05)。结论在采取长节段椎弓根钉内固定减压治疗胸腰段爆裂骨折的患者中,与传统入路相比,经Wiltse肌间入路置钉联合有限减压具有手术时间短、出血少、保护椎旁肌、最大限度保留后方稳定结构的优势。