The Impact of Vertebroplasty on Sagittal Parameters in Traumatic Thoracic Vertebral Fractures

Objective: It is well-established that vertebroplasty has effects on sagittal parameters due to various pathologies of the spine. Our objective in the study was to reveal the impact of vertebroplasty that was applied to compression fractures due to trauma on sagittal parameters. Material and Method: Twenty patients were included in the study. Scoliosis radiographs were shot preoperatively and at first month during the postoperative period. Spinopelvic parameters of each patient including pelvic incidence (PI), sacral slope (SS), pelvic tilt (PT), lumbar lordosis (LL), thoracic kyphosis (TK), thoracolumbar kyphosis (TLK), cervical lordosis (CL), and sagittal vertical axis (SVA) were assessed. Visual Analogue Scale (VAS) and Oswestry Disability Index (ODI) assessments of the patients were performed as well. Results: Spinopelvic parameter values of the patients were assessed statistically through the analysis of the Paired sample T test before surgery and in the first month during the postoperative period. It was determined that the changes in the PT, SS and LL values of the patients between preoperative and first month postoperative were at the level of p=0.659, p=0.716, p=0.012; and the changes were not significant. It was determined that the changes in the TL, TK, CL, SVA, VAS and ODI values of the patients between preoperative and first month postoperative were at the level of p <0.001and the changes were significant. Conclusion: Vertebroplasty is an efficient technique for relieving pain in thoracic fractures that have a score of 4 and over, based on the thoracolumbar injury classification score and that are type A, based on the AO Spine thoracolumbar injury classification score. Elimination of pain in the acute period is effective in ameliorating the sagittal parameters of patients

Designing microcapsules to save energy in buildings

Buildings consume the major portıon of the world’s energy. Improvements in building elements have been proven to significantly reduce this consumption. Integrating phase change materials (PCM) into a building’s parts is an effective solution to reduce energy consumption. PCMs help to maintain thermal comfort, reduce heating, cooling loads as well as improve passive storage of solar energy in buildings. Previous studies have concentrated on impregnating PCMs into materials like concrete mixes, gypsum wall boards, plasters, textured finishes, as well as PCM trombe walls, PCM shutters, PCM building blocks, air-based heating systems, floor heating systems, suspended ceiling boards, etc.[1]. The current challenge is to find a suitable PCM that can be safe, thermally effective and at the same time not adversely effect the durability of a building. PCMs may be in microcapsulated form to meet these challenges. The most common PCM studied previously is paraffin, be it in bulk or microencapsulated. Leakage of paraffin from porous structures, the breaking of microcapsules and the low thermal capacities of microencapsulated PCMs are the main problems that have been observed [2]. The current challenge is to find a suitable PCM that can be safe, thermally effective and at the same time not adversely effect the durability of a building. PCMs may be in microcapsulated form to meet these challenges. The most common PCM studied previously is paraffin, be it in bulk or microencapsulated. Leakage of paraffin from porous structures, the breaking of microcapsules and the low thermal capacities of microencapsulated PCMs are the main problems that have been observed [2. Paraffin is a fossil fuel derivative; thus, it is unsustainable. This study focuses on bio-based fatty acid mixtures as PCMs. We developed microcapsules of fatty acid mixtures that were tried in concrete mixes. Our design approach involved the following steps: determining and characterizing PCMs with suitable thermal properties; developing a method to synthesize microencapsulated PCMs; and finally incorporate these materials in buildings for improving thermal comfort and energy conservation. Please click Additional Files below to see the full abstract

Unconventional experimental technologies used for phase change materials (PCM) characterization: part2 morphological and structural characterization, physico-chemical stability and mechanical properties

Due to the high interest of appropriate characterization of PCM and hybrid PCM composites, different research centres and universities are using several material characterization techniques not commonly used with PCM, to study the structure and morphology of these materials. Likewise, physico-chemical stability is a crucial parameter for the performance of latent storage materials during time and its evaluation has been done by using molecular spectroscopy, chemiluminiscence or calorimetric tests. Atomic force microscopy and nanoindentation are also reported to characterize hybrid PCM composites

Unconventional experimental technologies used for phase change materials (PCM) characterization: part 2 – morphological and structural characterization, physico-chemical stability and mechanical properties

Due to the high interest of appropriate characterization of PCM and hybrid PCM composites, different research centres and universities are using several material characterization techniques not commonly used with PCM, to study the structure and morphology of these materials. Likewise, physico-chemical stability is a crucial parameter for the performance of latent storage materials during time and its evaluation has been done by using molecular spectroscopy, chemiluminiscence or calorimetric tests. Atomic force microscopy and nanoindentation are also reported to characterize hybrid PCM composites. Other chemical aspects studied are related with the compatibility of the PCM and its container and also considered in this compilation of characterization work.The work is partially funded by the European Union (COST Action COST TU0802) and the Spanish government (ENE2011- 28269-C03-01, ENE2011-28269-C03-02 and ENE2011-22722). The authors would like to thank the Catalan Government for the quality accreditation given to their research group GREA (2014 SGR 123) and their research group DIOPMA (2014 SGR 1543). Aran Solé would like to thank the Departament d’Universitats, Recerca i Societat de la Informació de la Generalitat de Catalunya for her research fellowship

Can lumbar paraspinal muscle/fat ratio and spinopelvic parameters predict short-term outcomes after decompressive surgeries in lumbar disc herniation and lumbar spinal stenosis?

Background and Objectives: We aimed to investigate whether the lumbar paraspinal muscle/fat ratio influences the outcomes of patients who had simple decompressive surgeries for lumbar disc herniation (LDH) or lumbar spinal stenosis. We also wanted to see if the spinopelvic parameters change with surgery and whether this change influences the outcomes. Materials and Methods: This was a prospective study on patients with lumbar spinal stenosis (20 patients) and LDH (20 patients) who underwent simple discectomy or decompressive surgery between November 2021 and May 2022. Visual Analog Scale (VAS) for back and leg pain, Oswestry Disability Index, and Japanese Orthopedic Association (JOA) score were performed before and 3 months after surgery. Spinopelvic parameters were measured on whole spine radiographs before and 3 months after surgery. On axial magnetic resonance images, paraspinal muscle volume and muscle/fat ratios were calculated. All data were statistically analyzed with SPSS program. Results: There was a significant improvement in VAS, Oswestry, and JOA scores after surgery. We observed that more preoperative paraspinal muscle mass was positively correlated with lumbar lordosis (LL) and negatively correlated with sagittal vertical axis (SVA), VAS leg scores, and Oswestry scores. Furthermore, we observed a positive correlation between preoperative SVA and VAS leg scores. Conclusion: Despite limited number of patients, and shorter follow-ups, this prospective study demonstrates a correlation among the lumbar paraspinal muscle/fat ratio, preoperative/postoperative spinopelvic parameters, and surgical outcomes. Increased paraspinal muscle ratio was correlated with lower SVA values and increased LL; lower VAS leg scores; higher Oswestry scores which reflects better surgical outcomes

Return-to-work after interlaminar endoscopic sequestrectomy: case series

Abstract Background Considering the epidemiology of single-level lumbar disc herniations (LDH) in the young and active patients, the impact on working capacity is highly relevant. The timing of return-to-work after lumbar surgery through various modalities differs greatly. This may be partly due diverse disparate surgical approaches along with differences in patient and surgeon. The purpose of this paper is to provide evidence for a return-to-work policy after endoscopic sequestrectomy and discuss possible clues to a faster recovery of patients that did not receive a sick-leave report via a case series. Case presentation The sample comprises fourteen cases of single-level LDH that underwent endoscopic interlaminar sequestrectomy and did not receive a sick-leave report and were advised to return-to-work whenever they felt fit so. Time until return-to-work, pre- and post-operative leg VAS pain scores and amount of analgesic used post-operatively were retrospectively analyzed. Fourteen patients were operated on using the same technique and on average returned to work after 6.6 ± 1.8 days, used 3.7 ± 2.5 analgesic tablets before returning to work and had a postoperative leg VAS pain score of 1.4 ± 1.2. No patient requested a sick-leave report during the follow-up period of 1 month. Conclusions The patients in this case series had a remarkably short period of sick-leave and a low number of analgesic usage. These findings may be due to selection of patients who were operated on specifically for leg pain with the absence of lower back pain suggesting integrity of annulus fibrosus. We can postulate that intraoperative preservation of lamina, facet joint and annulus fibrosus along with reassurance of the surgeon suggesting to return-to-work whenever fell fit so were the key factors in the swifter recovery of the patients

Kyphosis After Thoracolumbar Spine Fractures: WFNS Spine Committee Recommendations

Thoracolumbar fractures change the biomechanics of the spine. Load distribution causes kyphosis by the time. Treatment of posttraumatic kyphosis is still controversial. We reviewed the literature between 2010 and 2020 using a search with keywords thoracolumbar fracture and kyphosis. We removed osteoporotic fractures, ankylosing spondylitis fractures, non-English language papers, case reports, and low-quality case series. Up-to-date information on posttraumatic kyphosis management was reviewed to reach an agreement in a consensus meeting of the World Federation of Neurosurgical Societies (WFNS) Spine Committee. The first meeting was conducted in Peshawar in December 2019 with WFNS Spine Committee members' presence and participation. The second meeting was a virtual meeting via the internet on June 12, 2020. We utilized the Delphi method to administer the questionnaire to preserve a high degree of validity. We summarized 42 papers on posttraumatic kyphosis. Surgical treatment of thoracolumbar kyphosis due to unstable burst fractures can be done via a posterior only approach. Less blood loss and reduced surgery time are the main advantages of posterior surgery. Kyphosis angle for surgical decision and fusion levels are controversial. However, global sagittal balance should be taken into consideration for the segment that has to be included. Adding an intermediate screw at the fractured level strengthens the construct