Computer Assisted Surgery最新文献

{"title":"Early postoperative efficacy of a fully automated orthopedic robotic system-assisted percutaneous pedicle screw fixation for isthmic spondylolisthesis.","authors":"Li Zongze,Cheng Yongquan,Zeng Guanjie,Zhu Yongjian,Cui Yuhui,Jiang Hui,Chen Jianting","doi":"10.1080/24699322.2024.2399502","DOIUrl":"https://doi.org/10.1080/24699322.2024.2399502","url":null,"abstract":"To assess the feasibility of percutaneous pedicle screw fixation assisted by a fully automated orthopedic robotic system for the treatment of isthmic spondylolisthesis and evaluate its early postoperative outcome. Totally 20 patients with isthmic spondylolisthesis who underwent surgical procedure by the same medical group from March 2020 to March 2023 were retrospectively analyzed, including 10 patients in the robot-assisted group (RA group) and the other 10 patients in the conventional free-hand technique group (FH group). Accuracy of screw insertion was determined using the Gertzbein-Robbins Scale. The accuracy of the novel robotic system was evaluated by comparing the screw position in the preoperative planning and measuring the entry point deviation distance and the trajectory rotation. The differences in operative time, intraoperative blood loss, radiographic fluoroscopy time and fluoroscopic dosage, and length of hospital stay were compared between the two groups. The lumbar visual analog scale scores before and 7 days after operation were analyzed to evaluate the improvement of low back pain as the early postoperative outcome. A total of 84 pedicle screws were placed. In the RA group, 97.5% of screws were Grade A, and 2.5% were Grade B. In the FH group, 88.6% of screws were Grade A, 9.1% were Grade B, and 2.3% were Grade C. No statistical difference was found in the operation time between two groups. The RA group showed a significant reduction in intraoperative blood loss, radiographic fluoroscopy time and fluoroscopic dosage, and length of hospital stay compared to the FH group. The low back pain in both groups was significantly improved after the operation. The novel orthopedic robotic system-assisted percutaneous pedicle screw fixation, with accurate intraoperative screw placement, less surgical damage, less fluoroscopy and shorter length of hospital stay, can be safe and effective for the surgical treatment of isthmic spondylolisthesis.","PeriodicalId":56051,"journal":{"name":"Computer Assisted Surgery","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Virtual surgical planning in craniomaxillofacial surgery: a structured review.","authors":"Kaye Velarde, Rentor Cafino, Armando Isla, Karen Mae Ty, Xavier-Lewis Palmer, Lucas Potter, Larry Nadorra, Luchin Valrian Pueblos, Lemuel Clark Velasco","doi":"10.1080/24699322.2023.2271160","DOIUrl":"10.1080/24699322.2023.2271160","url":null,"abstract":"<p><p>Craniomaxillofacial (CMF) surgery is a challenging and very demanding field that involves the treatment of congenital and acquired conditions of the face and head. Due to the complexity of the head and facial region, various tools and techniques were developed and utilized to aid surgical procedures and optimize results. Virtual Surgical Planning (VSP) has revolutionized the way craniomaxillofacial surgeries are planned and executed. It uses 3D imaging computer software to visualize and simulate a surgical procedure. Numerous studies were published on the usage of VSP in craniomaxillofacial surgery. However, the researchers found inconsistency in the previous literature which prompted the development of this review. This paper aims to provide a comprehensive review of the findings of the studies by conducting an integrated approach to synthesize the literature related to the use of VSP in craniomaxillofacial surgery. Twenty-nine related articles were selected as a sample and synthesized thoroughly. These papers were grouped assigning to the four subdisciplines of craniomaxillofacial surgery: orthognathic surgery, reconstructive surgery, trauma surgery and implant surgery. The following variables - treatment time, the accuracy of VSP, clinical outcome, cost, and cost-effectiveness - were also examined. Results revealed that VSP offers advantages in craniomaxillofacial surgery over the traditional method in terms of duration, predictability and clinical outcomes. However, the cost aspect was not discussed in most papers. This structured literature review will thus provide current findings and trends and recommendations for future research on the usage of VSP in craniomaxillofacial surgery.</p>","PeriodicalId":56051,"journal":{"name":"Computer Assisted Surgery","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49685405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance assessment of surgical tracking systems based on statistical process control and longitudinal QA.","authors":"I Butz, M Fernandez, A Uneri, N Theodore, W S Anderson, J H Siewerdsen","doi":"10.1080/24699322.2023.2275522","DOIUrl":"10.1080/24699322.2023.2275522","url":null,"abstract":"<p><p>A system for performance assessment and quality assurance (QA) of surgical trackers is reported based on principles of geometric accuracy and statistical process control (SPC) for routine longitudinal testing. A simple QA test phantom was designed, where the number and distribution of registration fiducials was determined drawing from analytical models for target registration error (TRE). A tracker testbed was configured with open-source software for measurement of a TRE-based accuracy metric <math><mi>ε</mi></math> and Jitter (<math><mi>J</mi></math>). Six trackers were tested: 2 electromagnetic (EM - Aurora); and 4 infrared (IR - 1 Spectra, 1 Vega, and 2 Vicra) - all NDI (Waterloo, ON). Phase I SPC analysis of Shewhart mean (<math><mrow><mrow><mrow><mover><mrow><mi>x</mi></mrow><mo>¯</mo></mover></mrow></mrow></mrow></math>) and standard deviation (<math><mi>s</mi></math>) determined system control limits. Phase II involved weekly QA of each system for up to 32 weeks and identified Pass, Note, Alert, and Failure action rules. The process permitted QA in <1 min. Phase I control limits were established for all trackers: EM trackers exhibited higher upper control limits than IR trackers in <math><mi>ε</mi></math> (EM: <math><mrow><msub><mrow><mrow><mrow><mrow><mover><mrow><mi>x</mi></mrow><mo>¯</mo></mover></mrow></mrow></mrow></mrow><mrow><mi>ε</mi></mrow></msub></mrow><mi> </mi><mo>∼</mo></math>2.8-3.3 mm, IR: <math><mrow><msub><mrow><mrow><mrow><mrow><mover><mrow><mi>x</mi></mrow><mo>¯</mo></mover></mrow></mrow></mrow></mrow><mrow><mi>ε</mi></mrow></msub></mrow><mi> </mi><mo>∼</mo></math>1.6-2.0 mm) and Jitter (EM: <math><mrow><msub><mrow><mrow><mrow><mrow><mover><mrow><mi>x</mi></mrow><mo>¯</mo></mover></mrow></mrow></mrow></mrow><mrow><mi>jitter</mi></mrow></msub></mrow><mi> </mi><mo>∼</mo></math>0.30-0.33 mm, IR: <math><mrow><msub><mrow><mrow><mrow><mrow><mover><mrow><mi>x</mi></mrow><mo>¯</mo></mover></mrow></mrow></mrow></mrow><mrow><mi>jitter</mi></mrow></msub></mrow><mi> </mi><mo>∼</mo></math>0.08-0.10 mm), and older trackers showed evidence of degradation - e.g. higher Jitter for the older Vicra (<i>p</i>-value < .05). Phase II longitudinal tests yielded 676 outcomes in which a total of 4 Failures were noted - 3 resolved by intervention (metal interference for EM trackers) - and 1 owing to restrictive control limits for a new system (Vega). Weekly tests also yielded 40 Notes and 16 Alerts - each spontaneously resolved in subsequent monitoring.</p>","PeriodicalId":56051,"journal":{"name":"Computer Assisted Surgery","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71523503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on augmented reality navigation of in vitro fenestration of stent-graft based on deep learning and virtual-real registration.","authors":"Fengfeng He, Xiaoyu Qi, Qingmin Feng, Qiang Zhang, Ning Pan, Chao Yang, Shenglin Liu","doi":"10.1080/24699322.2023.2289339","DOIUrl":"10.1080/24699322.2023.2289339","url":null,"abstract":"<p><strong>Objectives: </strong><i>In vitro</i> fenestration of stent-graft (IVFS) demands high-precision navigation methods to achieve optimal surgical outcomes. This study aims to propose an augmented reality (AR) navigation method for IVFS, which can provide <i>in situ</i> overlay display to locate fenestration positions.</p><p><strong>Methods: </strong>We propose an AR navigation method to assist doctors in performing IVFS. A deep learning-based aorta segmentation algorithm is used to achieve automatic and rapid aorta segmentation. The Vuforia-based virtual-real registration and marker recognition algorithm are integrated to ensure accurate <i>in situ</i> AR image.</p><p><strong>Results: </strong>The proposed method can provide three-dimensional <i>in situ</i> AR image, and the fiducial registration error after virtual-real registration is 2.070 mm. The aorta segmentation experiment obtains dice similarity coefficient of 91.12% and Hausdorff distance of 2.59, better than conventional algorithms before improvement.</p><p><strong>Conclusions: </strong>The proposed method can intuitively and accurately locate fenestration positions, and therefore can assist doctors in performing IVFS.</p>","PeriodicalId":56051,"journal":{"name":"Computer Assisted Surgery","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138500344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving alignment in total knee arthroplasty: a cadaveric assessment of a surgical navigation tool with computed tomography imaging.","authors":"Kelly A Foley,&nbsp;Ran Schwarzkopf,&nbsp;Brian M Culp,&nbsp;Michael P Bradley,&nbsp;Jeffrey M Muir,&nbsp;Emily I McIntosh","doi":"10.1080/24699322.2023.2267749","DOIUrl":"10.1080/24699322.2023.2267749","url":null,"abstract":"<p><strong>Purpose: </strong>To investigate the accuracy of an imageless, optical surgical navigation tool to assist with femoral and tibial bone cuts performed during TKA.</p><p><strong>Patients and methods: </strong>Six board-certified orthopedic surgeons participated in a laboratory cadaver investigation, performing femoral and tibial bone cuts with the assistance of a computer navigation tool. Femoral and tibial varus/valgus, tibial slope, femoral flexion, and both femoral and tibial rotation measurements from the device were compared with angular measurements calculated from computed tomography (CT) images of the knees.</p><p><strong>Results: </strong>Measurements with the navigation tool were highly correlated with those obtained from CT scans in all three axes. For the distal femoral cut, the absolute mean difference in varus/valgus was 0.83° (SD 0.46°, <i>r</i> = 0.76), femoral flexion was 1.91° (SD 1.16°, <i>r</i> = 0.85), and femoral rotation was 1.29° (SD 1.01°, <i>r</i> = 0.88) relative to Whiteside's line and 0.97° (SD 0.56°, <i>r</i> = 0.81) relative to the posterior condylar axis. For the tibia, the absolute mean difference in varus/valgus was 1.08° (SD 0.64°, <i>r</i> = 0.85), posterior slope was 2.78° (SD 1.40°, <i>r</i> = 0.60), and rotation relative to the anteroposterior axis (posterior cruciate ligament to the medial third of the tibial tuberosity) was 2.98° (SD 2.54°, <i>r</i> = 0.79).</p><p><strong>Conclusion: </strong>Utilization of an imageless navigation tool may aid surgeons in accurately performing and monitoring femoral and tibial bone cuts, and implant rotation in TKA and thus, more accurately align TKA components.</p>","PeriodicalId":56051,"journal":{"name":"Computer Assisted Surgery","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41241695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biomechanical behavior of the three-dimensionally printed surgical plates for mandibular defect reconstruction: a finite element analysis.","authors":"Chao-Fei Wang, Shuo Liu, Lei-Hao Hu, Yao Yu, Xin Peng, Wen-Bo Zhang","doi":"10.1080/24699322.2023.2286181","DOIUrl":"10.1080/24699322.2023.2286181","url":null,"abstract":"<p><p>The aim of the study was to investigate the biomechanical behavior of three-dimensionally (3D)-printed surgical plates used for mandibular defect reconstruction, compare them with conventional surgical plates, and provide experimental evidence for their clinical application. Three-dimensional models were created for the normal mandible and for mandibular body defects reconstructed using free fibula and deep circumflex iliac artery flaps. Three-dimensional finite element models of reconstructed mandibles fixed using 3D-printed and conventional surgical plates were established. Vertical occlusal forces were applied to the remaining teeth and the displacement and Von Mises stress distributions were studied using finite element analysis. The normal and reconstructed mandibles had similar biomechanical behaviors. The displacement distributions for the surgical plates were similar, and the maximum total deformation occurred at the screw hole of the anterior segment of the surgical plates. However, there were differences in the Von Mises stress distributions for the surgical plates. In reconstructed mandibles fixed using 3D-printed surgical plates, the maximum equivalent Von Mises stress occurred at the screw hole of the posterior segment, while in those fixed using conventional surgical plates, the maximum equivalent Von Mises stress was at the screw hole of the anterior segment. In the mandible models reconstructed with the same free flap but fixed with different surgical plates, the plates had similar biomechanical behaviors. The biomechanical behavior of 3D-printed surgical plates was similar to conventional surgical plates, suggesting that 3D-printed surgical plates used to reconstruct mandibular body defects with vascularized autogenous bone grafts could lead to secure and stable fixation.</p>","PeriodicalId":56051,"journal":{"name":"Computer Assisted Surgery","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138447210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A trial to visualize perforators images from CTA with a tablet device: experience of operating on minipigs.","authors":"Hisato Konoeda,&nbsp;Miyuki Uematsu,&nbsp;Nie Jumxiao,&nbsp;Ken Masamune,&nbsp;Hiroyuki Sakurai","doi":"10.1080/24699322.2022.2104172","DOIUrl":"https://doi.org/10.1080/24699322.2022.2104172","url":null,"abstract":"<p><p>A reliable method for precise perforator mapping can be extremely valuable in perforator flap surgery. In this study, we attempted to map perforator location using 3-dimensional computed tomography angiography (CTA), a newly developed application, and a tablet device. Preliminary examinations to test the device were conducted in mini-pigs. We used 5 female mini-pigs. Preoperative imaging of the vasculature was undertaken with CTA in the prone position, following Iopamidol (200 ml) injection via the internal jugular vein. Prior to the examination, we placed round markers on the backs of the mini-pigs. To assess accuracy, we compared the perforator positions acquired with an optical position measurement device with the perforator positions acquired with the tablet device. Furthermore, we compared the perforator positions with the tablet navigation device, which we measured directly. We measured 12 perforators with the optical position measurement device. The mean difference was 10 mm (minimum, 2 mm; maximum, 20 mm). We measured these perforators with the tablet navigation device. The mean difference was 5.4 mm (minimum, 0 mm; maximum, 20 mm). The perforator flaps were elevated safely. The perforator flaps could be elevated safely using our device, as the mean difference was only 10 mm, which is acceptable for navigating perforator flap operations. Pig backs are triangular in shape; therefore, we were unable to place markers on the contralateral side. Thus, for clinical applications of the device, we should determine the ideal marker locations.</p>","PeriodicalId":56051,"journal":{"name":"Computer Assisted Surgery","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40587311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Review of research on path planning and control methods of flexible steerable needle puncture robot.","authors":"Kaiyu Wu,&nbsp;Bing Li,&nbsp;Yongde Zhang,&nbsp;Xuesong Dai","doi":"10.1080/24699322.2021.2023647","DOIUrl":"https://doi.org/10.1080/24699322.2021.2023647","url":null,"abstract":"<p><p>In the field of minimally invasive interventional therapy, the related research on the soft tissue puncture robot and its technology based on the flexible steerable needle as a research hot topic at present, and it has been developed rapidly in the past ten years. In order to better understand the development status of the flexible steerable needle puncture (FSNP) robot and provide reference for its design and improvement in subsequent research, it is necessary to introduce in two aspects of FSNP robot: the puncture path planning and the control methods. First, this article introduced the concept of the FSNP technology, and the necessity of the application of FSNP soft tissue robot in minimally invasive interventional surgery. Second, this article mainly introduced the principle of FSNP, the path planning of FSNP, the navigation and positioning control of the needle tip of the flexible steerable needle, the control method of FSNP system, and the controllable flexible needle. Finally, combined with the above analysis and introduction, it was pointed out that FSNP soft tissue robot and its related technology would be an important development direction in the field of minimally invasive interventional therapy in the future, and the current existing problems were pointed out. Meanwhile, the development trend of FSNP robot control technology was summarized and prospected.</p>","PeriodicalId":56051,"journal":{"name":"Computer Assisted Surgery","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40344714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surgical declarative knowledge learning: concept and acceptability study.","authors":"A Huaulmé,&nbsp;G Dardenne,&nbsp;B Labbe,&nbsp;M Gelin,&nbsp;C Chesneau,&nbsp;J M Diverrez,&nbsp;L Riffaud,&nbsp;P Jannin","doi":"10.1080/24699322.2022.2086484","DOIUrl":"https://doi.org/10.1080/24699322.2022.2086484","url":null,"abstract":"<p><p>Improving surgical training by means of technology assistance is an important challenge that aims to directly impact surgical quality. Surgical training includes the acquisition of two categories of knowledge: declarative knowledge (i.e. 'knowing what') and procedural knowledge (i.e. 'knowing how'). It is essential to acquire both before performing any particular surgery. There are currently many tools for acquiring procedural knowledge, such as simulators. However, few approaches or tools allow a trainer to formalize and record surgical declarative knowledge, and a trainee to have easy access to it. In this paper, we propose an approach for structuring surgical declarative knowledge according to procedural knowledge and based on surgical process modeling. A dedicated software application has been implemented. We evaluated the concept and the software usability on two procedures with different medical populations: endoscopic third ventriculostomy involving 6 neurosurgeons and preparation of a surgical table for craniotomy involving 4 scrub nurses. The results of both studies show that surgical process models could be a well-adapted approach for structuring and visualizing surgical declarative knowledge. The software application was perceived by neurosurgeons and scrub nurses as an innovative tool for managing and presenting surgical knowledge. The preliminary results show that the feasibility of the proposed approach and the acceptability and usability of the corresponding software. Future experiments will study impact of such an approach on knowledge acquisition.</p>","PeriodicalId":56051,"journal":{"name":"Computer Assisted Surgery","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40122558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The design and application of an individualized 3D printing assisted guide plates in assisting sacroiliac screws insertion.","authors":"Mu-Rong You,&nbsp;Zhi-Qiang Fan,&nbsp;Hai-Min Ye,&nbsp;Zhe Wang,&nbsp;Chun-Hua Zou,&nbsp;Xie-Ping Dong","doi":"10.1080/24699322.2022.2102542","DOIUrl":"https://doi.org/10.1080/24699322.2022.2102542","url":null,"abstract":"<p><strong>Objective: </strong>Currently, the sacroiliac screws insertion still faces several challenges in the fixation of pelvic and acetabular injuries. This study was aimed to design a personalized three-dimensional (3D) printing assisted guide plates to assist sacroiliac screws insertion, so as to provide a reference for further clinical applications.</p><p><strong>Methods: </strong>Eight pelvic specimens (5 males and 3 females) of normal adults were used to simulate actual operation. After thin-layer CT scanning, the 3D models of pelvis were established based on the images data. Furthermore, in Mimics 17.0 software, the screw entry points and screw channels of sacroiliac screws were further simulated and designed, and the appropriate range of the posterior superior iliac spine was selected to establish and print the virtual guide plates. Then, the simulated screws insertion was performed <i>in vitro</i>, the pelvic specimens after screws insertion were scanned again by CT, and the effect of screws insertion was further evaluated.</p><p><strong>Results: </strong>A total of 16 sacroiliac screw guide plates were designed and printed, and 48 screws were inserted on both sides. Therein, 45 screws were completely located in the sacral vertebra, which was determined as grade 0, with an accuracy rate of 93.2%. The other 3 screws penetrated the anterior cortex or sacral canal of sacral vertebra, including 2 screws in Grade 1 (4.1%) and 1 screw in Grade 2 (2.1%). Compared with the simulated screw channels, the anterior and posterior offset angles of the cross section were (0.912 ± 0.625) ° and (0.802 ± 0.681) ° respectively, with no significant difference (<i>p</i> > 0.05). The upper and lower offset angles of coronal plane were (1.158 ± 0.823) ° and (1.034 ± 0.908) ° respectively, and there was no significant difference (<i>p</i> > 0.05).</p><p><strong>Conclusions: </strong>3 D printing guide plates assisted sacroiliac screws insertion can enhance the stability of pelvic posterior ring fixation and assist surgeons to reduce the difficulty of operation.</p>","PeriodicalId":56051,"journal":{"name":"Computer Assisted Surgery","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40617360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}