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Is Multilevel Anterior Lumbar Interbody Fusion (ALIF) Superior to Pedicle Subtraction Osteotomy (PSO) for Degenerative Lumbar Deformity? Clin Spine Surg 2020; 33:1-4. [PMID: 30932932 DOI: 10.1097/bsd.0000000000000817] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Pimentel CA, Souza JWDL, Santos FSFD, Sá MDD, Ferreira VP, Barreto GBDC, Rodrigues JFB, Sousa WJBD, Britto Filho CO, Sousa FKAD, Fook MVL. Sulfonated poly(ether ether ketone)/hydroxyapatite membrane as biomaterials: process evaluation. POLIMEROS 2019. [DOI: 10.1590/0104-1428.01018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Tsai TH, Wu DS, Su YF, Wu CH, Lin CL. A retrospective study to validate an intraoperative robotic classification system for assessing the accuracy of kirschner wire (K-wire) placements with postoperative computed tomography classification system for assessing the accuracy of pedicle screw placements. Medicine (Baltimore) 2016; 95:e4834. [PMID: 27661024 PMCID: PMC5044894 DOI: 10.1097/md.0000000000004834] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
This purpose of this retrospective study is validation of an intraoperative robotic grading classification system for assessing the accuracy of Kirschner-wire (K-wire) placements with the postoperative computed tomography (CT)-base classification system for assessing the accuracy of pedicle screw placements.We conducted a retrospective review of prospectively collected data from 35 consecutive patients who underwent 176 robotic assisted pedicle screws instrumentation at Kaohsiung Medical University Hospital from September 2014 to November 2015. During the operation, we used a robotic grading classification system for verifying the intraoperative accuracy of K-wire placements. Three months after surgery, we used the common CT-base classification system to assess the postoperative accuracy of pedicle screw placements. The distributions of accuracy between the intraoperative robot-assisted and various postoperative CT-based classification systems were compared using kappa statistics of agreement.The intraoperative accuracies of K-wire placements before and after repositioning were classified as excellent (131/176, 74.4% and 133/176, 75.6%, respectively), satisfactory (36/176, 20.5% and 41/176, 23.3%, respectively), and malpositioned (9/176, 5.1% and 2/176, 1.1%, respectively)In postoperative CT-base classification systems were evaluated. No screw placements were evaluated as unacceptable under any of these systems. Kappa statistics revealed no significant differences between the proposed system and the aforementioned classification systems (P <0.001).Our results revealed no significant differences between the intraoperative robotic grading system and various postoperative CT-based grading systems. The robotic grading classification system is a feasible method for evaluating the accuracy of K-wire placements. Using the intraoperative robot grading system to classify the accuracy of K-wire placements enables predicting the postoperative accuracy of pedicle screw placements.
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Affiliation(s)
- Tai-Hsin Tsai
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University
- Department of Neurosurgery, Kaohsiung Medical University Hospital
- Correspondence: Tai-Hsin Tsai, Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Division of Neurosurgery, Department of Neurosurgery, Kaohsiung Medical University Hospital, No. 100 Tzyou 1st Road, 80708 Kaohsiung, Taiwan (e-mail: )
| | - Dong-Syuan Wu
- Department of Neurosurgery, Kaohsiung Municipal Hsiao-Kang Hospital
| | - Yu-Feng Su
- Department of Neurosurgery, Kaohsiung Medical University Hospital
- Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chieh-Hsin Wu
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University
- Department of Neurosurgery, Kaohsiung Medical University Hospital
| | - Chih-Lung Lin
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University
- Department of Neurosurgery, Kaohsiung Medical University Hospital
- Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
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Roskies M, Jordan JO, Fang D, Abdallah MN, Hier MP, Mlynarek A, Tamimi F, Tran SD. Improving PEEK bioactivity for craniofacial reconstruction using a 3D printed scaffold embedded with mesenchymal stem cells. J Biomater Appl 2016; 31:132-9. [DOI: 10.1177/0885328216638636] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Objective Polyetheretherketone (PEEK) is a bioinert thermoplastic that has been investigated for its potential use in craniofacial reconstruction; however, its use in clinical practice is limited by a poor integration with adjacent bone upon implantation. To improve the bone–implant interface, two strategies have been employed: to modify its surface or to impregnate PEEK with bioactive materials. This study attempts to combine and improve upon the two approaches by modifying the internal structure into a trabecular network and to impregnate PEEK with mesenchymal stem cells. Furthermore, we compare the newly designed PEEK scaffolds' interactions with both bone-derived (BMSC) and adipose (ADSC) stem cells. Design Customized PEEK scaffolds were designed to incorporate a trabecular microstructure using a computer-aided design program and then printed via selective laser sintering (SLS), a 3D-printing process with exceptional accuracy. The scaffold structure was evaluated using microCT. Scanning electron microscopy (SEM) was used to evaluate scaffold morphology with and without mesenchymal stem cells (MSCs). Adipose and bone marrow mesenchymal cells were isolated from rats and cultured on scaffolds. Cell proliferation and differentiation were assessed using alamarBlue and alkaline phosphatase assays, respectively. Cell morphology after one week of co-culturing cells with PEEK scaffolds was evaluated using SEM. Results SLS 3D printing fabricated scaffolds with a porosity of 36.38% ± 6.66 and density of 1.309 g/cm2. Cell morphology resembled viable fibroblasts attaching to the surface and micropores of the scaffold. PEEK scaffolds maintained the viability of both ADSCs and BMSCs; however, ADSCs demonstrated higher osteodifferentiation than BMSCs ( p < 0.05). Conclusions This study demonstrates for the first time that SLS 3D printing can be used to fabricate customized porous PEEK scaffolds that maintain the viability of adipose and bone marrow-derived MSCs and induce the osteodifferentiation of the adipose-derived MSCs. The combination of 3D printed PEEK scaffolds with MSCs could overcome some of the limitations using PEEK biopolymers for load-bearing bone regeneration in craniofacial reconstruction.
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Affiliation(s)
- Michael Roskies
- Department of Otolaryngology – Head & Neck Surgery, McGill University, Montreal, QC, Canada
- Craniofacial Stem Cell and Tissue Engineering Laboratory, McGill University, Montreal, QC, CA
| | - Jack O Jordan
- Craniofacial Stem Cell and Tissue Engineering Laboratory, McGill University, Montreal, QC, CA
| | - Dongdong Fang
- Craniofacial Stem Cell and Tissue Engineering Laboratory, McGill University, Montreal, QC, CA
| | | | - Michael P Hier
- Department of Otolaryngology – Head & Neck Surgery, McGill University, Montreal, QC, Canada
| | - Alex Mlynarek
- Department of Otolaryngology – Head & Neck Surgery, McGill University, Montreal, QC, Canada
| | - Faleh Tamimi
- Faculty of Dentistry, McGill University, Montreal, QC, Canada
| | - Simon D Tran
- Craniofacial Stem Cell and Tissue Engineering Laboratory, McGill University, Montreal, QC, CA
- Faculty of Dentistry, McGill University, Montreal, QC, Canada
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