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Carter M, Hua R, Pitt JB, Zeineddin S, Perez A, Sands L, Kujawa S, Lehane A, Stake C, Reynolds M, Abdullah F, Goldstein SD. Utility of White Light Scanning as an Alternative to Computed Tomography to Evaluate Severity of Pectus Excavatum Deformity. J Pediatr Surg 2024; 59:1694-1702. [PMID: 38772759 DOI: 10.1016/j.jpedsurg.2024.04.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 04/15/2024] [Accepted: 04/23/2024] [Indexed: 05/23/2024]
Abstract
BACKGROUND Pectus excavatum (PE) severity and surgical candidacy are determined by computed tomography (CT)-delineated Haller Index (HI) and Correction Index (CI). White light scanning (WLS) has been proposed as a non-ionizing alternative. The purpose of this retrospective study is to create models to determine PE severity using WLS as a non-ionizing alternative to CT. METHODS Between November 2015 and February 2023, CT and WLS were performed for children ≤18 years undergoing evaluation at a high-volume, chest-wall deformity clinic. Separate quadratic discriminate analysis models were developed to predict CT HI ≥ 3.25 and CT CI ≥ 28% indicating surgical candidacy. Two bootstrap forest models were trained on WLS measurements and patient demographics to predict CT HI and CT CI values then compared to actual index values by intraclass correlation coefficient (ICC). RESULTS In total, 242 patients were enrolled (86.4% male, mean [SD] age 15.2 [1.3] years). Quadratic discriminate analysis models predicted CT HI ≥ 3.25 with specificity = 91.7%, PPV = 97.7% (AUC = 0.91), and CT CI ≥ 28% with specificity = 92.3%, PPV = 93.5% (AUC = 0.84). Bootstrap forest model predicted CT HI with training dataset ICC (95% CI) = 0.91 (0.88-0.93, R2 = 0.85) and test dataset ICC (95% CI) = 0.86 (0.71-0.94, R2 = 0.77). For CT CI, training dataset ICC (95% CI) = 0.91 (0.81-0.93, R2 = 0.86) and test dataset ICC (95% CI) = 0.75 (0.50-0.88, R2 = 0.63). CONCLUSIONS Using noninvasive and nonionizing WLS imaging, we can predict PE severity at surgical threshold with high specificity obviating the need for CT. Furthermore, we can predict actual CT HI and CI with moderate-excellent reliability. We anticipate this point-of-care tool to obviate the need for most cross-sectional imaging during surgical evaluation of PE. LEVEL OF EVIDENCE Level III. STUDY TYPE Study of Diagnostic Test.
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Affiliation(s)
- Michela Carter
- Division of Pediatric Surgery, Department of Surgery, Northwestern University's Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, United States.
| | - Rui Hua
- Division of Pediatric Surgery, Department of Surgery, Northwestern University's Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, United States; Shirley Ryan AbilityLab, Chicago, IL, United States
| | - J Benjamin Pitt
- Division of Pediatric Surgery, Department of Surgery, Northwestern University's Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, United States
| | - Suhail Zeineddin
- Division of Pediatric Surgery, Department of Surgery, Northwestern University's Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, United States
| | - Amparo Perez
- Division of Pediatric Surgery, Department of Surgery, Northwestern University's Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, United States
| | - Laurie Sands
- Division of Pediatric Surgery, Department of Surgery, Northwestern University's Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, United States
| | - Suzanne Kujawa
- Division of Pediatric Surgery, Department of Surgery, Northwestern University's Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, United States
| | - Alison Lehane
- Division of Pediatric Surgery, Department of Surgery, Northwestern University's Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, United States
| | - Christine Stake
- Division of Pediatric Surgery, Department of Surgery, Northwestern University's Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, United States
| | - Marleta Reynolds
- Division of Pediatric Surgery, Department of Surgery, Northwestern University's Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, United States
| | - Fizan Abdullah
- Division of Pediatric Surgery, Department of Surgery, Northwestern University's Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, United States
| | - Seth D Goldstein
- Division of Pediatric Surgery, Department of Surgery, Northwestern University's Feinberg School of Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, United States
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Solitro GF, Welborn MC, Mehta AI, Amirouche F. How to Optimize Pedicle Screw Parameters for the Thoracic Spine? A Biomechanical and Finite Element Method Study. Global Spine J 2024; 14:187-194. [PMID: 35499547 PMCID: PMC10676166 DOI: 10.1177/21925682221099470] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
STUDY DESIGN Pedicle screw study. OBJECTIVE The selection of pedicle screw parameters usually involves the surgeon's analysis of preoperative CT imaging along with anatomical landmarks and tactile examination. However, there is minimal consensus on a standardized guideline for selection methods on pedicle screws. We aimed to determine the effects of thoracic screw diameter to pedicle width on pullout strength determined by cortical bone purchase. METHODS Biomechanical study performed with human cadaveric thoracic vertebrae and experimentally validated three-dimensional finite element model instrumented with pedicle screws of various diameters. We used a variable (SD/PW) ratio to express the screw selection. We hypothesized a positive correlation between the pullout load determined by the bone purchase and the SD/PW. This relationship was first investigated in a validated finite element model considering bone purchase related to the strength of an upper thoracic vertebra. Then, the correlation to the entire spine is evaluated. RESULTS The failure load ranged from 371.3 to 1601.0 N, respectively, for 3 and 6 mm screws. The determinant coefficient was increased to R2=.421 when a linear relationship between pullout load and the SD/PW ratio was used. The peak loads of 1216 and 1288N were found for an SD/PW ratio of .83. CONCLUSION We have found that the screw pullout load is more correlated to SD/PW than other pedicle measures for a maximized SD/PW ratio of .83. This particular value should be considered the upper limit of the indicated SD/PW ratio and a means to determine the optimal screw diameter to enhance pullout strength.
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Affiliation(s)
| | - Michelle C. Welborn
- Department of Neurosurgery, University of Illinois at Chicago, Chicago, Il, USA
| | - Ankit I. Mehta
- Department of Orthopaedic Surgery, NorthShore University HealthSystem, Evanston, Il, USA
| | - Farid Amirouche
- Department of Orthopaedics, Louisiana State University, Chicago, Il, USA
- College of Medicine, University of Illinois at Chicago, Chicago, Il, USA
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Sakaran R, Alias A, Woon CK, Ku Mohd Noor KM, Zaidun NH, Zulkiflee NDI, Lin NW, Chung E. Sex estimation on thoracic vertebrae: A systematic review. TRANSLATIONAL RESEARCH IN ANATOMY 2023. [DOI: 10.1016/j.tria.2023.100243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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Pivazyan G, Sandhu FA, Beaufort AR, Cunningham BW. Basis for error in stereotactic and computer-assisted surgery in neurosurgical applications: literature review. Neurosurg Rev 2022; 46:20. [PMID: 36536143 DOI: 10.1007/s10143-022-01928-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 11/29/2022] [Accepted: 12/07/2022] [Indexed: 12/24/2022]
Abstract
Technological advancements in optoelectronic motion capture systems have allowed for the development of high-precision computer-assisted surgery (CAS) used in cranial and spinal surgical procedures. Errors generated sequentially throughout the chain of components of CAS may have cumulative effect on the accuracy of implant and instrumentation placement - potentially affecting patient outcomes. Navigational integrity and maintenance of fidelity of optoelectronic data is the cornerstone of CAS. Error reporting measures vary between studies. Understanding error generation, mechanisms of propagation, and how they relate to workflow can assist clinicians in error mitigation and improve accuracy during navigation in neurosurgical procedures. Diligence in planning, fiducial positioning, system registration, and intra-operative workflow have the potential to improve accuracy and decrease disparity between planned and final instrumentation and implant position. This study reviews the potential errors associated with each step in computer-assisted surgery and provides a basis for disparity in intrinsic accuracy versus achieved accuracy in the clinical operative environment.
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Affiliation(s)
- Gnel Pivazyan
- Department of Neurosurgery, MedStar Georgetown University Hospital, Washington, District of Columbia, USA.
- Musculoskeletal Education Center, Department of Orthopaedic Surgery, MedStar Union Memorial Hospital, Baltimore, MD, USA.
| | - Faheem A Sandhu
- Department of Neurosurgery, MedStar Georgetown University Hospital, Washington, District of Columbia, USA
| | | | - Bryan W Cunningham
- Musculoskeletal Education Center, Department of Orthopaedic Surgery, MedStar Union Memorial Hospital, Baltimore, MD, USA
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Sato T, Nojiri H, Okuda T, Miyagawa K, Kobayashi N, Takahashi R, Shimura A, Tamagawa S, Ohara Y, Hara T, Ishijima M. Three-dimensional morphological analysis of the thoracic pedicle and related radiographic factors in adolescent idiopathic scoliosis. BMC Musculoskelet Disord 2022; 23:847. [PMID: 36068555 PMCID: PMC9450434 DOI: 10.1186/s12891-022-05799-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 09/02/2022] [Indexed: 11/10/2022] Open
Abstract
Background This study aimed to investigate the laterality of the pedicle morphology at the apical vertebra (AV) level and identify the radiographic factors associated with the laterality ratio of the pedicle morphology at the AV level in patients with adolescent idiopathic scoliosis (AIS). Methods Overall, 684 pedicles in 57 AIS patients aged 10–20 years, who underwent preoperative computed tomography (CT) and had Lenke type 1 or 2 with right convex main thoracic curves (MTC), were evaluated. Pedicle diameters of the MTC were assessed. We defined and compared the region containing two vertebrae adjacent to the AV (APEX±1) and the region containing two vertebrae adjacent to the neutral vertebra. We analyzed the pedicle diameter and laterality ratio of APEX±1 and performed multiple linear regression analysis to identify the radiographic factors associated with the laterality of the pedicle diameter. Results On the concave side of APEX±1, the pedicles of 15 patients (26.3%) did not accept a 4-mm-diameter pedicle screw (PS), even with 25% cortical bone width expansion. Laterality ratio differences in the pedicle diameters of the cortical bone width in APEX±1 were large in patients with more proximal AV level (p < 0.001) and smaller apical vertebral rotation (AVR) (p = 0.029). Conclusions Preoperative planning to accurately select and insert the PS in AIS should be based on the anatomical limitations in APEX±1, AV level, and AVR degree. In APEX±1, the correlation between AVR and the laterality ratio of the pedicle diameter may be useful for pathoetiological interpretation of the AIS deformity. Supplementary Information The online version contains supplementary material available at 10.1186/s12891-022-05799-4.
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Affiliation(s)
- Tatsuya Sato
- Department of Orthopedic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyoku, Tokyo, Japan
| | - Hidetoshi Nojiri
- Department of Orthopedic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyoku, Tokyo, Japan.
| | - Takatoshi Okuda
- Department of Orthopedic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyoku, Tokyo, Japan
| | - Kei Miyagawa
- Department of Orthopedic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyoku, Tokyo, Japan
| | - Nozomu Kobayashi
- Department of Orthopedic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyoku, Tokyo, Japan
| | - Ryosuke Takahashi
- Department of Orthopedic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyoku, Tokyo, Japan
| | - Arihisa Shimura
- Department of Orthopedic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyoku, Tokyo, Japan
| | - Shota Tamagawa
- Department of Orthopedic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyoku, Tokyo, Japan
| | - Yukoh Ohara
- Department of Neurosurgery, Juntendo University, Tokyo, Japan
| | - Takeshi Hara
- Department of Neurosurgery, Juntendo University, Tokyo, Japan
| | - Muneaki Ishijima
- Department of Orthopedic Surgery, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyoku, Tokyo, Japan
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Cunningham BW, Brooks DM. Comparative Analysis of Optoelectronic Accuracy in the Laboratory Setting Versus Clinical Operative Environment: A Systematic Review. Global Spine J 2022; 12:59S-74S. [PMID: 35393881 PMCID: PMC8998481 DOI: 10.1177/21925682211035083] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
STUDY DESIGN Systematic review. OBJECTIVES The optoelectronic camera source and data interpolation process serve as the foundation for navigational integrity in robotic-assisted surgical platforms. The current systematic review serves to provide a basis for the numerical disparity observed when comparing the intrinsic accuracy of optoelectronic cameras versus accuracy in the laboratory setting and clinical operative environments. METHODS Review of the PubMed and Cochrane Library research databases was performed. The exhaustive literature compilation obtained was then vetted to reduce redundancies and categorized into topics of intrinsic accuracy, registration accuracy, musculoskeletal kinematic platforms, and clinical operative platforms. RESULTS A total of 465 references were vetted and 137 comprise the basis for the current analysis. Regardless of application, the common denominators affecting overall optoelectronic accuracy are intrinsic accuracy, registration accuracy, and application accuracy. Intrinsic accuracy equaled or was less than 0.1 mm translation and 0.1 degrees rotation per fiducial. Controlled laboratory platforms reported 0.1 to 0.5 mm translation and 0.1 to 1.0 degrees rotation per array. Accuracy in robotic-assisted spinal surgery reported 1.5 to 6.0 mm translation and 1.5 to 5.0 degrees rotation when comparing planned to final implant position. CONCLUSIONS Navigational integrity and maintenance of fidelity of optoelectronic data is the cornerstone of robotic-assisted spinal surgery. Transitioning from controlled laboratory to clinical operative environments requires an increased number of steps in the optoelectronic kinematic chain and error potential. Diligence in planning, fiducial positioning, system registration and intra-operative workflow have the potential to improve accuracy and decrease disparity between planned and final implant position.
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Affiliation(s)
- Bryan W. Cunningham
- Department of Orthopaedic Surgery, Musculoskeletal Research and Innovation Institute, MedStar Union Memorial Hospital, Baltimore, MD, USA
- Department of Orthopaedic Surgery, Georgetown University School of Medicine, Washington, DC, USA
| | - Daina M. Brooks
- Department of Orthopaedic Surgery, Musculoskeletal Research and Innovation Institute, MedStar Union Memorial Hospital, Baltimore, MD, USA
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Cunningham BW, Brooks DM, McAfee PC. Accuracy of Robotic-Assisted Spinal Surgery-Comparison to TJR Robotics, da Vinci Robotics, and Optoelectronic Laboratory Robotics. Int J Spine Surg 2021; 15:S38-S55. [PMID: 34607917 PMCID: PMC8532535 DOI: 10.14444/8139] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND The optoelectronic camera source and data interpolation serve as the foundation for navigational integrity in the robotic-assisted surgical platform. The objective of the current systematic review serves to provide a basis for the numerical disparity that exists when comparing the intrinsic accuracy of optoelectronic cameras: accuracy observed in the laboratory setting versus accuracy in the clinical operative environment. It is postulated that there exists a greater number of connections in the optoelectronic kinematic chain when analyzing the clinical operative environment to the laboratory setting. This increase in data interpolation, coupled with intraoperative workflow challenges, reduces the degree of accuracy based on surgical application and to that observed in controlled musculoskeletal kinematic laboratory investigations. METHODS Review of the PubMed and Cochrane Library research databases was performed. The exhaustive literature compilation obtained was then vetted to reduce redundancies and categorized into topics of intrinsic optoelectronic accuracy, registration accuracy, musculoskeletal kinematic platforms, and clinical operative platforms. RESULTS A total of 147 references make up the basis for the current analysis. Regardless of application, the common denominators affecting overall optoelectronic accuracy are intrinsic accuracy, registration accuracy, and application accuracy. Intrinsic accuracy of optoelectronic tracking equaled or was less than 0.1 mm of translation and 0.1° of rotation per fiducial. Controlled laboratory platforms reported 0.1 to 0.5 mm of translation and 0.1°-1.0° of rotation per array. There is a huge falloff in clinical applications: accuracy in robotic-assisted spinal surgery reported 1.5 to 6.0 mm of translation and 1.5° to 5.0° of rotation when comparing planned to final implant position. Total Joint Robotics and da Vinci urologic robotics computed accuracy, as predicted, lies between these two extremes-1.02 mm for da Vinci and 2 mm for MAKO. CONCLUSIONS Navigational integrity and maintenance of fidelity of optoelectronic data is the cornerstone of robotic-assisted spinal surgery. Transitioning from controlled laboratory to clinical operative environments requires an increased number of steps in the optoelectronic kinematic chain and error potential. Diligence in planning, fiducial positioning, system registration, and intraoperative workflow have the potential to improve accuracy and decrease disparity between planned and final implant position. The key determining factors limiting navigation resolution accuracy are highlighted by this Cochrane research analysis.
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Affiliation(s)
- Bryan W. Cunningham
- Musculoskeletal Education Center, Department of Orthopaedic Surgery, MedStar Union Memorial Hospital, Baltimore, Maryland
- Department of Orthopaedic Surgery, Georgetown University School of Medicine, Washington, D.C
| | - Daina M. Brooks
- Musculoskeletal Education Center, Department of Orthopaedic Surgery, MedStar Union Memorial Hospital, Baltimore, Maryland
| | - Paul C. McAfee
- Musculoskeletal Education Center, Department of Orthopaedic Surgery, MedStar Union Memorial Hospital, Baltimore, Maryland
- Department of Orthopaedic Surgery, Georgetown University School of Medicine, Washington, D.C
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How I do it: tapered rod placement across the cervicothoracic junction for augmented posterior constructs. Acta Neurochir (Wien) 2019; 161:2429-2431. [PMID: 31696301 DOI: 10.1007/s00701-019-04081-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 09/17/2019] [Indexed: 10/25/2022]
Abstract
BACKGROUND Posterior instrumentation techniques are commonly employed for cervicothoracic fixation. The pedicles of the upper thoracic vertebrae can typically accommodate larger diameter screws than the subaxial cervical vertebrae. In many construct systems, this requires the use of a tapered rod, which can be technically challenging to place. METHOD Using a three-dimensionally printed biomimetic spine simulator, we illustrate the stepwise process of instrumentation and tapered rod placement across the cervicothoracic junction (CTJ). CONCLUSION Tapered rod systems can augment the biomechanical stability of cervicothoracic constructs. Ease of rod placement across the CTJ hinges upon a systematic method of instrumentation.
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Kwan MK, Chiu CK, Chan CYW, Zamani R, Hansen-Algenstaedt N. The use of fluoroscopic guided percutaneous pedicle screws in the upper thoracic spine (T1-T6): Is it safe? J Orthop Surg (Hong Kong) 2018; 25:2309499017722438. [PMID: 28748740 DOI: 10.1177/2309499017722438] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
PURPOSE This study analysed the accuracy and safety of the fluoroscopic guided percutaneous screws in the upper thoracic vertebrae (T1-T6). METHODS Computed tomography scans from 74 patients were retrospectively evaluated between January 2008 and December 2012. Pedicle perforations were classified by two types of grading systems. For medial, lateral, superior and inferior perforations: grade 0 - no violation; grade 1 - <2 mm; grade 2 - 2-4 mm and grade 3 - >4 mm. For anterior perforations: grade 0 - no violation; grade 1 - <4 mm; grade 2 - 4-6 mm and grade 3 - >6 mm. RESULTS There were 35 (47.3%) male and 39 (52.7%) female patients with a total 260 thoracic pedicle screws (T1-T6) analysed. There were 32 screw perforations which account to a perforation rate of 12.3% (11.2% grade 1, 0.7% grade 2 and 0.4% grade 3). None led to pedicle screw-related complications. The perforation rate was highest at T1 (33.3%, all grade 1 perforations), followed by T6 (14.5%) and T4 (14.0%). CONCLUSION Fluoroscopic guided percutaneous pedicle screws of the upper thoracic spine (T1-T6) are technically more demanding and carry potential risks of serious complications. Extra precautions need to be taken when fluoroscopic guided percutaneous pedicle screws are placed at T1 and T2 levels, due to high medial pedicular angulation and obstruction of lateral fluoroscopic images by the shoulder girdle and at T4-T6 levels, due to smaller pedicular width.
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Affiliation(s)
- Mun Keong Kwan
- 1 Department of Orthopaedic Surgery (NOCERAL), University of Malaya, Kuala Lumpur, Malaysia
| | - Chee Kidd Chiu
- 1 Department of Orthopaedic Surgery (NOCERAL), University of Malaya, Kuala Lumpur, Malaysia
| | - Chris Yin Wei Chan
- 1 Department of Orthopaedic Surgery (NOCERAL), University of Malaya, Kuala Lumpur, Malaysia
| | - Reza Zamani
- 2 Department of Spine Surgery, Orthocentrum Hamburg, Parkklinik Manhagen, Hansastrasse, Hamburg, Germany
| | - Nils Hansen-Algenstaedt
- 2 Department of Spine Surgery, Orthocentrum Hamburg, Parkklinik Manhagen, Hansastrasse, Hamburg, Germany.,3 Department of Orthopaedics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Gao B, Gao W, Chen C, Wang Q, Lin S, Xu C, Huang D, Su P. What is the Difference in Morphologic Features of the Thoracic Pedicle Between Patients With Adolescent Idiopathic Scoliosis and Healthy Subjects? A CT-based Case-control Study. Clin Orthop Relat Res 2017; 475:2765-2774. [PMID: 28766159 PMCID: PMC5638737 DOI: 10.1007/s11999-017-5448-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 07/11/2017] [Indexed: 01/31/2023]
Abstract
BACKGROUND Describing the morphologic features of the thoracic pedicle in patients with adolescent idiopathic scoliosis is necessary for placement of pedicle screws. Previous studies showed inadequate reliability owing to small sample size and heterogeneity of the patients surveyed. QUESTIONS/PURPOSES To use CT scans (1) to describe the morphologic features of 2718 thoracic pedicles from 60 female patients with Lenke Type 1 adolescent idiopathic scoliosis and 60 age-, sex-, and height-matched controls; and (2) to classify the pedicles in three types based on pedicle width and analyze the distribution of each type. METHODS A total of 2718 pedicles from 60 female patients with Lenke Type 1 adolescent idiopathic scoliosis and 60 matched female controls were analyzed via CT. All patients surveyed were diagnosed with adolescent idiopathic scoliosis, Lenke Type 1, at the First Affiliated Hospital of Sun Yat-sen University, and all underwent pedicle screw fixation between January 2008 and December 2013 with preoperative radiographs and CT images on file. We routinely obtained CT scans before these procedures; all patients who underwent surgery during that period had CT scans, and all were available for analysis here. Control subjects had CT scans for other clinical indications and had no abnormal findings of the spine. The control subjects were chosen to match patients in terms of age (15 ± 2.6 years versus 15 ± 2.6 years) and sex. Height of the two groups also was matched (154 ± 9 cm versus 155 ± 10 cm; mean difference, -1.06 cm; 95% CI, -1.24 to -0.81 cm; p < 0.001). Pedicle width and length were measured from T1 to T12. The thoracic spine was classified in four regions: apical vertebra in the structural curve (AV-SC), nonapical vertebra in the structural curve (NAV-SC), apical vertebra in the nonstructural curve (AV-NSC), and nonapical vertebra in the nonstructural curve (NAV-NSC). Pedicles were classified in three types: pedicle width less than 2 mm as Type I, 2 mm to 4 mm as Type II, and greater than 4 mm as Type III. Types I and II were defined as dysplastic pedicles. Paired t test, independent samples t test, one-way ANOVA, followed by Bonferroni's post hoc test and chi-square or Fisher's exact tests were used for statistical comparisons between patients and controls, as appropriate. RESULTS No difference was found between pedicle width on the convex side (PWv) and in controls (PWn), but pedicle width on the concave side (PWc) (4.99 ± 1.87 mm) was found to be narrower than PWv (6 ± 1.66 mm) and PWn (6 ± 1.45 mm). The variation degree of pedicle width (VDPW) was greatest in the AV-SC region (34% ± 37%), in comparison to AV-NSC (20% ± 25%) (mean difference, 14%; 95% CI, 1.15%-27%; p = 0.025), NAV-SC (17% ± 30%) (mean difference, 17%; 95% CI, 7%-27%; p < 0.001), and NAV-NSC (11% ± 24%) (mean difference, 24%; 95% CI, 13%-34%; p < 0.001). Dysplastic pedicles appeared more in patients with adolescent idiopathic scoliosis (22%; 293 of 1322) compared with controls (13%; 178 of 1396) (odds ratio [OR] = 0.51; 95% CI, 0.42-0.63; p < 0.001). In patients with adolescent idiopathic scoliosis, they commonly occurred on the concave side 34% (228 of 661) and on the AV-SC region (32%; 43 of 136). CONCLUSIONS Pedicle width on the concave side was narrower than pedicle width on the convex side and pedicle width in healthy control subjects. The apical vertebra in the structural curve was the most variegated region of the curve with the highest prevalence of dysplastic pedicles. CLINICAL RELEVANCE Our study can help surgeons perform preoperative assessments in females with adolescent idiopathic scoliosis, and with preoperative and intraoperative management for difficult pedicle screw placement. In particular, our results suggest that surgeons should exercise increased vigilance when selecting pedicle screw dimensions, especially in the concave aspect of the mid-thoracic curve, to avoid cortical breeches. Future studies should evaluate other Lenke types of adolescent idiopathic scoliosis, and males with adolescent idiopathic scoliosis.
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Affiliation(s)
- Bo Gao
- Department of Orthopaedics, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, China
| | - Wenjie Gao
- Department of Orthopaedics, The First Affiliated Hospital of Sun Yat-sen University, #58 Zhongshan Road II, Guangzhou, 510080 Guangdong China ,Department of Spine Surgery, Xi’an Honghui Hospital, Xi’an Jiaotong University, Xi’an, China
| | - Chong Chen
- Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Qinghua Wang
- Department of Orthopaedics, The First Affiliated Hospital of Sun Yat-sen University, #58 Zhongshan Road II, Guangzhou, 510080 Guangdong China
| | - Shaochun Lin
- Department of Radiology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Caixia Xu
- Research Centre for Translational Medicine, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Dongsheng Huang
- Department of Orthopaedics, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, China
| | - Peiqiang Su
- Department of Orthopaedics, The First Affiliated Hospital of Sun Yat-sen University, #58 Zhongshan Road II, Guangzhou, 510080 Guangdong China ,Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, 510080 China
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Xu W, Zhang X, Ke T, Cai H, Gao X. 3D printing-assisted preoperative plan of pedicle screw placement for middle-upper thoracic trauma: a cohort study. BMC Musculoskelet Disord 2017; 18:348. [PMID: 28800768 PMCID: PMC5553797 DOI: 10.1186/s12891-017-1703-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 07/31/2017] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND This study aimed to evaluate the application of 3D printing in assisting preoperative plan of pedicle screw placement for treating middle-upper thoracic trauma. METHODS A preoperative plan was implemented in seven patients suffering from middle-upper thoracic (T3-T7) trauma between March 2013 and February 2016. In the 3D printing models, entry points of 56 pedicle screws (Magerl method) and 4 important parameters of the pedicle screws were measured, including optimal diameter (ϕ, mm), length (L, mm), inclined angle (α), head-tilting angle (+β), and tail-tilting angle (-β). In the surgery, bare-hands fixation of pedicle screws was performed using 3D printing models and the measured parameters as guidance. RESULTS A total of seven patients were enrolled, including five men and two women, with the age of 21-62 years (mean age of 37.7 years). The position of the pedicle screw was evaluated postoperatively using a computerized tomography scan. Totally, 56 pedicle screws were placed, including 33 pieces of level 0, 18 pieces of level 1, 4 pieces of level 2 (pierced lateral wall), and 1 piece of level 3 (pierced lateral wall, no adverse consequences), with a fine rate of 91.0%. CONCLUSIONS 3D printing technique is an intuitive and effective assistive technology to pedicle screw fixation for treating middle-upper thoracic vertebrae, which improve the accuracy of bare-hands screw placement and reduce empirical errors. TRIAL REGISTRATION The trial was approved by the Ethics Committee of the Fujian Provincial Hospital. It was registered on March 1st, 2013, and the registration number was K2013-03-001.
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Affiliation(s)
- Wei Xu
- Department of Emergency & Trauma Surgery, Fujian Provincial Hospital, Fuzhou, Fujian Province, 350001, China. .,Department of Trauma, Institute of Emergency Medicine, Fujian Provincial Hospital, Fuzhou, Fujian Province, 350001, China. .,Clinical Institute of Provincial Hospital, Fujian Medical University, Fuzhou, Fujian Province, 350001, China.
| | - Xuming Zhang
- Department of Emergency & Trauma Surgery, Fujian Provincial Hospital, Fuzhou, Fujian Province, 350001, China.,Department of Trauma, Institute of Emergency Medicine, Fujian Provincial Hospital, Fuzhou, Fujian Province, 350001, China.,Clinical Institute of Provincial Hospital, Fujian Medical University, Fuzhou, Fujian Province, 350001, China
| | - Tie Ke
- Department of Emergency & Trauma Surgery, Fujian Provincial Hospital, Fuzhou, Fujian Province, 350001, China.,Department of Trauma, Institute of Emergency Medicine, Fujian Provincial Hospital, Fuzhou, Fujian Province, 350001, China.,Clinical Institute of Provincial Hospital, Fujian Medical University, Fuzhou, Fujian Province, 350001, China
| | - Hongru Cai
- Department of Emergency & Trauma Surgery, Fujian Provincial Hospital, Fuzhou, Fujian Province, 350001, China.,Department of Trauma, Institute of Emergency Medicine, Fujian Provincial Hospital, Fuzhou, Fujian Province, 350001, China.,Clinical Institute of Provincial Hospital, Fujian Medical University, Fuzhou, Fujian Province, 350001, China
| | - Xiang Gao
- Department of Emergency & Trauma Surgery, Fujian Provincial Hospital, Fuzhou, Fujian Province, 350001, China.,Department of Trauma, Institute of Emergency Medicine, Fujian Provincial Hospital, Fuzhou, Fujian Province, 350001, China.,Clinical Institute of Provincial Hospital, Fujian Medical University, Fuzhou, Fujian Province, 350001, China
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Knez D, Likar B, Pernus F, Vrtovec T. Computer-Assisted Screw Size and Insertion Trajectory Planning for Pedicle Screw Placement Surgery. IEEE TRANSACTIONS ON MEDICAL IMAGING 2016; 35:1420-1430. [PMID: 26742125 DOI: 10.1109/tmi.2016.2514530] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Pathological conditions that cause instability of the spine are commonly treated by vertebral fixation involving pedicle screw placement surgery. However, existing methods for preoperative planning are based only on geometrical properties of vertebral structures (i.e., shape) without taking into account their structural properties (i.e., appearance). We propose a novel automated method for computer-assisted preoperative planning of the thoracic pedicle screw size and insertion trajectory. The proposed method extracts geometrical properties of vertebral structures by parametric modeling of vertebral bodies and pedicles in three dimensions (3D), and combines them with structural properties, evaluated through underlying image intensities in computed tomography (CT) images while considering the guidelines for pedicle screw design. The method was evaluated on 81 pedicles, obtained from 3D CT images of 11 patients that were appointed for pedicle screw placement surgery. In terms of mean absolute difference (MAD) and corresponding standard deviation (SD), the resulting high modeling accuracy of 0.39±0.31 mm for 3D vertebral body models and 0.31±0.25 mm for 3D pedicle models created an adequate anatomical frame for 3D pedicle screw models. When comparing the automatically obtained and manually defined plans for pedicle screw placement, a relatively high agreement was observed, with MAD ±SD of 0.4±0.4 mm for the screw diameter, 5.8±4.2 mm for the screw length, 2.0±1.4 mm for the pedicle crossing point and 7.6±5.8(°) for screw insertion angles. However, a statistically significant increase of 48±26% in the screw fastening strength in favor of the proposed automated method was observed in 99% of the cases.
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Pedicle Morphometry of Lumbar Vertebrae: Male, Taller, and Heavier Specimens Have Bigger Pedicles. Spine (Phila Pa 1976) 2015; 40:1639-46. [PMID: 26244405 DOI: 10.1097/brs.0000000000001086] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN An anatomic study of pedicle dimensions was performed for lumbar vertebrae from American subjects. OBJECTIVE To quantify the dimensions of the lumbar pedicles and to better define the demographic factors that could ultimately govern the caliber selection of pedicle screws. SUMMARY OF BACKGROUND DATA Transpedicular screw fixation allows for segmental instrumentation into multiple vertebrae across multilevel fusion area, offering considerable biomechanical advantage over the conventional hook and lateral mass fixation. Large variations in morphology from previous studies may be related to differences in demographics, sample size, and methodology. METHODS For this study, L1-L5 vertebrae from 503 American human cadavers were directly measured with a digital caliper. Examiner measured each vertebra to determine medial-lateral pedicle width (PW) and cranial-caudal pedicle height (PH). Demographic information regarding age, sex, and race, as well as body height and weight, was available for all 503 subjects. RESULTS PH decreased in size caudally down the lumbar spine, but PW increased in size. The largest PH was at the L1 level with a mean of 15.75 mm. The widest PW was at the L5 level with a mean of 18.33 mm. Males have larger pedicles than females for all lumbar levels. The tallest and heaviest groups generally had larger pedicles than the shorter and lighter groups, respectively. Age and race did not consistently affect pedicle dimension in a statistically significant manner. CONCLUSION Our large-scale study of American specimens characterized the relationship between pedicle dimensions and a variety of demographic factors such as age, sex, body height, and weight. With substantial statistical power, the current study showed that male, taller, and heavier individuals had larger lumbar pedicles. LEVEL OF EVIDENCE 3.
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Accuracy and safety of fluoroscopic guided percutaneous pedicle screws in thoracic and lumbosacral spine: a review of 2000 screws. Spine (Phila Pa 1976) 2015; 40:E954-63. [PMID: 25929207 DOI: 10.1097/brs.0000000000000958] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Retrospective study. OBJECTIVE To investigate the accuracy and safety of percutaneous pedicle screws placed using fluoroscopic guidance in the thoracic and lumbosacral spine. SUMMARY OF BACKGROUND DATA Several studies had examined the accuracy and safety of percutaneous pedicle screws but provided large variations in their results with small number of patients or few number of pedicle screws evaluated. METHODS Computerized tomography of patients who had surgery with fluoroscopic guided percutaneous pedicle screws were chosen from 2 centers: (1) European patients from University Medical Center Hamburg-Eppendorf, Germany and (2) Asian patients from University Malaya Medical Centre, Malaysia. Screw perforations were classified into Grade 0, Grade 1 (<2 mm), Grade 2 (2-4 mm), and Grade 3 (>4 mm). RESULTS In total, 2000 percutaneous pedicle screws from 273 patients were analyzed: 1290 screws from 183 European patients and 710 screws from 90 Asian patients. The mean age was 59.1 ± 15.6. There were 140 male patients and 133 female patients. The total perforation rate was 9.4% with 151 (7.5%) Grade 1, 31 (1.6%) Grade 2, and 5 (0.3%) Grade 3 perforations. The total perforation rates among Europeans were 9.4% and among Asians were 9.3%. There was no difference between the 2 groups (P > 0.05). There were 3 distinct peaks in perforation rates (trimodal distribution) at T1, midthoracic region (T4-T7), and lumbosacral junction (L5 and S1). The highest perforation rates were at T1 (33.3%), S1 (19.4%), and T4 (18.6%). CONCLUSION Implantation of percutaneous pedicle screws insertion using fluoroscopic guidance is safe and has the accuracy comparable to open techniques of pedicle screws insertion. LEVEL OF EVIDENCE 4.
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Kwan MK, Chiu CK, Chan CYW, Zamani R, Hansen-Algenstaedt N. A comparison of feasibility and safety of percutaneous fluoroscopic guided thoracic pedicle screws between Europeans and Asians: is there any difference? EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2015. [PMID: 26223743 DOI: 10.1007/s00586-015-4150-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE To directly compare the safety of fluoroscopic guided percutaneous thoracic pedicle screw placement between Caucasians and Asians. METHODS This was a retrospective computerized tomography (CT) evaluation study of 880 fluoroscopic guided percutaneous pedicle screws. 440 screws were inserted in 73 European patients and 440 screws were inserted in 75 Asian patients. Screw perforations were classified into Grade 0: no violation; Grade 1: <2 mm perforation; Grade 2: 2-4 mm perforation; and Grade 3: >4 mm perforation. For anterior perforations, the pedicle perforations were classified into Grade 0: no violation, Grade 1: <4 mm perforation; Grade 2: 4-6 mm perforation; and Grade 3: >6 mm perforation. RESULTS The inter-rater reliability was adequate with a kappa value of 0.83. The mean age of the study group was 58.3 ± 15.6 years. The indications for surgery were tumor (70.3 %), infection (18.2 %), trauma (6.8 %), osteoporotic fracture (2.7 %) and degenerative diseases (2.0 %). The overall screw perforation rate was 9.7 %, in Europeans 9.1 % and in Asians 10.2 % (p > 0.05). Grade 1 perforation rate was 8.4 %, Grade 2 was 1.2 % and Grade 3 was 0.1 % with no difference in the grade of perforations between Europeans and Asians (p > 0.05). The perforation rate was the highest in T1 (33.3 %), followed by T6 (14.5 %) and T4 (14.0 %). Majority of perforations occurred medially (43.5 %), followed by laterally (25.9 %), and anteriorly (23.5 %). There was no statistical significant difference (p > 0.05) in the perforation rates between right-sided pedicle screws and left-sided pedicle screws (R: 10.0 %, L: 9.3 %). CONCLUSIONS There were no statistical significant differences in the overall perforation rates, grades of perforations, direction of perforations for implantation of percutaneous thoracic pedicle screws insertion using fluoroscopic guidance between Europeans and Asians. The safety profile for this technique was comparable to the current reported perforation rates for conventional open pedicle screw technique.
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Affiliation(s)
- Mun Keong Kwan
- Department of Orthopaedic Surgery, Faculty of Medicine, National Orthopaedic Centre of Excellence for Research and Learning (NOCERAL), University Malaya, 50603, Kuala Lumpur, Malaysia
| | - Chee Kidd Chiu
- Department of Orthopaedic Surgery, Faculty of Medicine, National Orthopaedic Centre of Excellence for Research and Learning (NOCERAL), University Malaya, 50603, Kuala Lumpur, Malaysia.
| | - Chris Yin Wei Chan
- Department of Orthopaedic Surgery, Faculty of Medicine, National Orthopaedic Centre of Excellence for Research and Learning (NOCERAL), University Malaya, 50603, Kuala Lumpur, Malaysia
| | - Reza Zamani
- Orthocentrum Hamburg, Department of Spine Surgery, Parkklinik Manhagen, Hansastrasse, Hamburg, Germany
| | - Nils Hansen-Algenstaedt
- Orthocentrum Hamburg, Department of Spine Surgery, Parkklinik Manhagen, Hansastrasse, Hamburg, Germany.,Department of Orthopaedics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Abstract
STUDY DESIGN An anatomic study of pedicle dimensions was performed for lower thoracic vertebrae from American human subjects. OBJECTIVE To quantify the dimensions of the lower thoracic pedicles and to better define the demographic factors that could ultimately govern the caliber selection of pedicle screws. SUMMARY OF BACKGROUND DATA Transpedicular screw fixation allows for segmental instrumentation into multiple vertebrae across multilevel fusion area, offering considerable biomechanical advantage over the conventional hook and lateral mass fixation. Large variations in morphology from previous studies may be related to differences in demographics, sample size, and methodology. METHODS For this study, T7-T12 vertebrae from 503 American human cadavers were directly measured with a digital caliper. Examiner measured each vertebra to determine medial-lateral pedicle width and cranial-caudal pedicle height. Demographic information regarding age, sex, and race, as well as body height and weight, was available for all 503 subjects. RESULTS Both pedicle height and pedicle width generally increased in size caudally down the lower thoracic spine. The highest pedicle height was at the T12 level with a mean of 17.08 mm. The widest pedicle width was at the T11 level with a mean of 9.31 mm. Males have larger pedicles than females for all upper thoracic levels. The tallest and heaviest groups had larger pedicles than the shorter and lighter groups, respectively. Age and race did not consistently affect pedicle dimension in a statistically significant manner. CONCLUSION Our large-scale study of American specimens characterized the relationship between pedicle dimensions and a variety of demographic factors such as age, sex, body height and weight. With substantial statistical power, this study showed that male, taller, and heavier individuals had larger pedicles. LEVEL OF EVIDENCE N/A.
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Re: Yu CC, Bajwa NS, Toy JO, et al. Pedicle morphometry of upper thoracic vertebrae: an anatomic study of 503 cadaveric specimens. Spine (Phila Pa 1976) 2014;39:E1201-9. Spine (Phila Pa 1976) 2014; 39:E1494. [PMID: 25271502 DOI: 10.1097/brs.0000000000000619] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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