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https://www.readbyqxmd.com/read/29770162/effects-of-spine-motion-on-foot-slip-in-quadruped-bounding
#1
Dongliang Chen, Ningjie Li, Guifang Liu, Lei Chen, Yongyuan Wang, Chong Liu, Bo Zhuang
Translation and bend of the spine in the sagittal plane during high-speed quadruped running were investigated. The effect of the two spine motions on slip between the foot and the ground was also explored. First, three simplified sagittal plane models of quadruped mammals were studied in symmetric bounding. The first model's trunk allowed no relative motion, the second model allowed only trunk bend, and the third model allowed both bend and translation. Next, torque was introduced to equivalently replace spine motion and the possibility of foot slip of the three models was analyzed theoretically...
2018: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/29767314/minimally-invasive-reduction-and-percutaneous-posterior-fixation-of-one-level-traumatic-thoraco-lumbar-and-lumbar-spine-fractures
#2
Marco Tinelli, Friederike Töpfer, Michael Kreinest, Stefan Matschke, Paul A Grützner, Arnold J Suda
INTRODUCTION: Although open procedures are the gold standard, the alternative approach of minimal invasive reduction using percutaneous screws for thoracic and lumbar spine fractures is under discussion. Aim of this study was to investigate the results of reduction and the accuracy of screw placement in minimally invasive percutaneous posterior instrumentation for these fractures. MATERIALS AND METHODS: One hundred and twenty-seven patients with thoraco-lumbar and lumbar burst fractures and minimal invasive dorsal instrumentation were analyzed retrospectively in terms of the accuracy of pedicle screw placement and results of fracture reduction...
May 16, 2018: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/29761298/lumbar-muscle-atrophy-caused-by-harness-replacement-in-a-chronic-calf-model-of-total-artificial-heart-implantation
#3
Jamshid H Karimov, Kimberly A Such, Raymond Dessoffy, Kiyotaka Fukamachi
The postoperative care of animals implanted with mechanical circulatory support devices is complex. The standard of care requires continuous monitoring of hemodynamic parameters post implant, wound care, and maintenance of the animal's well-being, but also includes controlling the animal's biomechanics under conditions of continuous restraint and harnessing. In such studies, a harness provides secure fixation of the exteriorized device driveline and pressure lines and aids animal handling (lifting, position adjustment, and assistance with standing up)...
May 14, 2018: Journal of Artificial Organs: the Official Journal of the Japanese Society for Artificial Organs
https://www.readbyqxmd.com/read/29753275/cervical-spine-fracture-through-a-cervical-disc-replacement
#4
M Flanagan, D T Cawley, N Cassidy
INTRODUCTION: We report a rare case of cervical spine trauma through a cervical disc replacement and adjacent multilevel disc fusions. Cervical disc replacement (CDR) is a viable option for the surgical treatment of degenerative disc disease however long term follow up data regarding this operative technique is poor specifically relating to traumatic complications. We know of no previous reports of bilateral cervical pedicle fractures occurring adjacent to CDR and anterior cervical spine instrumentation...
March 29, 2018: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/29750754/the-barrow-biomimetic-spine-fluoroscopic-analysis-of-a-synthetic-spine-model-made-of-variable-3d-printed-materials-and-print-parameters
#5
Michael A Bohl, Michael A Mooney, Garrett J Repp, Peter Nakaji, Steve W Chang, Jay D Turner, U Kumar Kakarla
STUDY DESIGN: Objective and subjective fluoroscopic assessments of a new synthetic spine model. OBJECTIVE: To analyze the fluoroscopic performance and fidelity to human tissue of a new synthetic spine model. SUMMARY OF BACKGROUND DATA: The [blinded for review] Biomimetic Spine project aims to develop a 3-dimensional (3D) printed, synthetic spine model that will one day replace cadaveric tissue in spine biomechanical research. A crucial component to any biomimetic spine model is that it performs similarly to cadaveric tissue on standard diagnostic imaging modalities...
May 10, 2018: Spine
https://www.readbyqxmd.com/read/29720511/prednisolone-is-associated-with-a-worse-bone-mineral-density-in-primary-adrenal-insufficiency
#6
Kathrin Frey, Tina Kienitz, Julia Schulz, Manfred Ventz, Kathrin Zopf, Marcus Quinkler
CONTEXT: Patients with primary adrenal insufficiency (PAI) or congenital adrenal hyperplasia (CAH) receive life-long glucocorticoid (GC) therapy. Daily GC doses are often above the physiological cortisol production rate and can cause long-term morbidities such as osteoporosis. No prospective trial has investigated long-term effect of different GC-therapies on bone mineral density (BMD) in those patients. OBJECTIVES: To determine if patients on hydrocortisone (HC) or prednisolone show changes in BMD after follow-up of 5...
May 2, 2018: Endocrine Connections
https://www.readbyqxmd.com/read/29715139/bone-mineral-density-as-a-potential-predictive-factor-for-luminal-type-breast-cancer-in-postmenopausal-women
#7
Franco Lumachi, Stefano M M Basso, Valentina Camozzi, Roberto Spaziante, Paolo Ubiali, Mario Ermani
BACKGROUND/AIM: We performed a case-control study to evaluate whether bone mineral density (BMD) can be considered a potential predictive factor for luminal-type breast cancer (BC), that could be useful in constructing a predictive risk model. MATERIALS AND METHODS: The medical records of 297 postmenopausal women with luminal-type node-negative BC who underwent lumbar-spine dual-energy X-ray absorptiometry (DXA) with BMD measurement before surgery, were analyzed and compared with those of 297 age-matched randomly selected healthy controls...
May 2018: Anticancer Research
https://www.readbyqxmd.com/read/29713415/spinopelvic-alignment-and-low-back-pain-after-total-hip-replacement-arthroplasty-in-patients-with-severe-hip-osteoarthritis
#8
Yawara Eguchi, Satoshi Iida, Chiho Suzuki, Yoshiyuki Shinada, Tomoko Shoji, Kazuhisa Takahashi, Seiji Ohtori
Study Design: Retrospective observational study. Purpose: We examined change in lumbrosacral spine alignment and low back pain (LBP) following total hip arthroplasty (THA) in patients with severe hip osteoarthritis (OA). Overview of Literature: Severe hip osteoarthritis has been reported to cause spine alignment abnormalities and low back pain, and it has been reported that low back pain is improved following THA. Methods: Our target population included 30 patients (29 female, mean age 63...
April 2018: Asian Spine Journal
https://www.readbyqxmd.com/read/29707551/minimally-invasive-surgery-for-thoracolumbar-spinal-trauma
#9
REVIEW
Corey T Walker, David S Xu, Jakub Godzik, Jay D Turner, Juan S Uribe, William D Smith
The indications for operative intervention after thoracolumbar spine trauma have been well described. Advances in minimally invasive techniques, including percutaneous pedicle screw fixation and mini-open anterolateral retractor-based approaches can improve surgical outcomes when appropriately applied by reducing blood loss, operative duration and post-operative pain. Moreover, they allow for theoretical advantages by preservation of muscular and skeletal blood supply and innervation that is typically lost during the muscular dissection of open approaches...
March 2018: Annals of Translational Medicine
https://www.readbyqxmd.com/read/29696556/long-term-effect-of-testosterone-replacement-therapy-on-bone-in-hypogonadal-men-with-klinefelter-syndrome
#10
N Tahani, L Nieddu, G Prossomariti, M Spaziani, S Granato, F Carlomagno, A Anzuini, A Lenzi, A F Radicioni, E Romagnoli
PURPOSE: To assess different aspects of bone damage in untreated adult patients with Klinefelter Syndrome (KS) before and during testosterone replacement therapy (TRT). METHODS: Fifteen untreated hypogonadal men with KS and 26 control subjects (C) matched for age and BMI were recruited. Sex hormone levels were measured in all subjects. Lumbar spine (LS) and femoral (neck: FN and total hip: TH) bone mineral density (BMD), trabecular bone score (TBS), hip structure analysis (HSA) and fat measures (percentage of fat mass, android/gynoid ratio and visceral adipose tissue) were evaluated by DEXA...
April 25, 2018: Endocrine
https://www.readbyqxmd.com/read/29692935/percutaneous-injection-of-strontium-containing-hydroxyapatite-versus-polymethacrylate-plus-short-segment-pedicle-screw-fixation-for-traumatic-a2-and-a3-ao-type-fractures-in-adults
#11
Panagiotis Korovessis, Eva Mpountogianni, Vasileios Syrimpeis, Andreas Baikousis, Vasileios Tsekouras
Introduction: Polymethacrylate (PMMA) is commonly used in vertebroplasty and balloon kyphoplasty, but its use has been associated with complications. This study tests three hypotheses: (1) whether strontium hydroxyapatite (Sr-HA) is equivalent to PMMA for restoring thoracolumbar vertebral body fractures, (2) whether the incidence of PMMA leakage is similar to that of Sr-HA leakage, and (3) whether Sr-HAis is resorbed and substituted by new vertebral bone. Materials and Methods: Two age- and sex-matched groups received short percutaneous pedicle screw fixation plus PEEK implant (Kiva, VCF Treatment System, Benvenue Medical, Santa Clara, CA, USA) filled with either Sr-HA (Group A) or PMMA (Group B) after A2- and A3/AO-type thoracolumbar vertebral body fractures...
2018: Advances in Orthopedics
https://www.readbyqxmd.com/read/29680264/temporary-inhibition-of-the-plasminogen-activator-inhibits-periosteal-chondrogenesis-and-promotes-periosteal-osteogenesis-during-appendicular-bone-fracture-healing
#12
D Bravo, A M Josephson, V Bradaschia-Correa, M Z Wong, N L Yim, S S Neibart, S N Lee, J Huo, T Coughlin, M M Mizrahi, P Leucht
INTRODUCTION: Aminocaproic acid is approved as an anti-fibrinolytic for use in joint replacement and spinal fusion surgeries to limit perioperative blood loss. Previous animal studies have demonstrated a pro-osteogenic effect of aminocaproic acid in spine fusion models. Here, we tested if aminocaproic acid enhances appendicular bone healing and we sought to uncover the effect of aminocaproic acid on osteoprogenitor cells (OPCs) during bone regeneration. METHODS: We employed a well-established murine femur fracture model in adult C57BL/6J mice after receiving two peri-operative injections of aminocaproic acid...
April 19, 2018: Bone
https://www.readbyqxmd.com/read/29672421/human-versus-robot-a-propensity-matched-analysis-of-the-accuracy-of-free-hand-versus-robotic-guidance-for-placement-of-s2-alar-iliac-s2ai-screws
#13
Jamal N Shillingford, Joseph L Laratta, Paul J Park, Joseph M Lombardi, Alexander Tuchman, Comron S Saifi, Ronald A Lehman, Lawrence G Lenke
STUDY DESIGN: Retrospective matched cohort analysis. OBJECTIVE: To compare the accuracy of S2 alar-iliac (S2AI) screw placement by robotic guidance versus free hand technique. SUMMARY OF BACKGROUND DATA: Spinopelvic fixation utilizing S2AI screws provides optimal fixation across the lumbosacral junction allowing for solid fusion, especially in long segment fusion constructs. Traditionally, S2AI screw placement has required fluoroscopic guidance for accurate screw placement...
April 18, 2018: Spine
https://www.readbyqxmd.com/read/29671017/-degenerative-cervical-spine-diseases-fusion-vs-total-disc-replacement-what-can-be-done-when
#14
REVIEW
T Pitzen, J Drumm, C Berthold, G Ostrowski, U Heiler, M Ruf
Motion preserving surgery within the cervical spine may be performed by special implants, for example, c spine disc prosthesis or total disc replacement (cTDR), or by simple decompression of the cervical nerve roots. However, also fusion surgery may be performed with good results. Here, we summarize indications as well as contraindications for motion preserving techniques and indications for fusion surgery. cTDR is indicated in special cases of soft disc herniation, especially in younger individuals without signs of myelopathy...
April 18, 2018: Der Orthopäde
https://www.readbyqxmd.com/read/29668575/comparison-of-the-adverse-events-of-anterior-cervical-disc-replacement-versus-anterior-cervical-discectomy-and-fusion-a-protocol-for-a-systematic-review-and-meta-analysis-of-prospective-randomized-controlled-trials
#15
He Zhao, Li-Jun Duan, Yu-Shan Gao, Yong-Dong Yang, Xiang-Sheng Tang, Ding-Yan Zhao, Yang Xiong, Zhen-Guo Hu, Chuan-Hong Li, Si-Xue Chen, Tao Liu, Xing Yu
BACKGROUND: In the current surgical therapeutic regimen for symptomatic cervical degenerative disc disease, both anterior cervical discectomy and fusion (ACDF) and anterior cervical disc replacement (ACDR) are still widely accepted. However, many complications exist in both surgeries. Therefore, this study aims to compare the adverse events between ACDR and ACDF, and provide vital evidence-based guidance for spine surgeons and designers to evaluation of prognosis and improvement of dynamic devices...
April 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29667228/the-anterior-longitudinal-ligament-in-diffuse-idiopathic-skeletal-hyperostosis-ossified-or-displaced
#16
Jonneke S Kuperus, Esther Jm Smit, Behdad Pouran, Robbert W van Hamersvelt, Marijn van Stralen, Peter R Seevinck, Constantinus F Buckens, Ronald Law Bleys, Harrie H Weinans, F Cumhur Oner, Pim A de Jong, Jorrit-Jan Verlaan
Diffuse idiopathic skeletal hyperostosis (DISH) is often theorized to be an ossification of the anterior longitudinal ligament (ALL). Using computed tomography (CT) imaging and cryomacrotome sectioning we investigated the spatial relationship between the ALL and newly formed bone in DISH to test this hypothesis. In the current study, four human cadaveric spines diagnosed with DISH using CT imaging were frozen and sectioned using a cryomacrotome. Photographs were obtained of the specimen at 125µm intervals...
April 17, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29663509/patients-with-a-previous-total-hip-replacement-experience-less-reduction-of-back-pain-following-lumbar-back-surgery
#17
Ted Eneqvist, Erik Bülow, Szilárd Nemes, Helena Brisby, Göran Garellick, Peter Fritzell, Ola Rolfson
The coexistence of degenerative disorders from the hip joint and the lumbar spine, known as "the hip-spine syndrome", is a common encounter in clinical practice. These degenerative conditions may cause similar symptoms which often entail diagnostic challenges in determining the origin of pain. Low back surgery (LBS) with fusion and/or decompression, and total hip replacement (THR) are both often successful interventions. However, the knowledge is limited about the post-operative patient-reported outcome (PRO) following LBS in the presence of a prior THR...
April 16, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29662742/total-disc-replacement-versus-anterior-posterior-interbody-fusion-in-the-lumbar-spine-and-lumbosacral-junction-a-cost-analysis
#18
Timo Stubig, Malik Ahmed, Amir Ghasemi, Luigi Aurelio Nasto, Michael Grevitt
Study Design: Prospective observational cohort study. Objectives: To analyze clinical and economic results in patients with degenerative disc disease in the lumbar area for patients who received combined anterior and posterior fusion or total disc replacement (TDR). Methods: The study included 75 patients, 38 in the fusion group and 37 in the TDR group, who received either anterior/posterior fusion or TDR for lumbar disc disease from January 2005 to December 2008 with a minimum follow-up of 24 months...
April 2018: Global Spine Journal
https://www.readbyqxmd.com/read/29658148/biochemical-and-biomechanical-characterization-of-equine-cervical-facet-joint-cartilage
#19
S A O'Leary, J L White, J C Hu, K A Athanasiou
BACKGROUND: The equine cervical facet joint is a site of significant pathology. Located bilaterally on the dorsal spine, these diarthrodial joints work in conjunction with the intervertebral disc to facilitate appropriate spinal motion. Despite the high prevalence of pathology in this joint, the facet joint is understudied and thus lacking in viable treatment options. OBJECTIVE: The goal of this study was to characterise equine facet joint cartilage and provide a comprehensive database describing the morphological, histological, biochemical, and biomechanical properties of this tissue...
April 15, 2018: Equine Veterinary Journal
https://www.readbyqxmd.com/read/29657844/spine-hip-relations-in-patients-with-hip-osteoarthritis
#20
Charles Rivière, Stefan Lazic, Louis Dagneaux, Catherine Van Der Straeten, Justin Cobb, Sarah Muirhead-Allwood
Patients with hip osteoarthritis often have an abnormal spine-hip relation (SHR), meaning the presence of a clinically deleterious spine-hip and/or hip-spine syndrome.Definition of the individual SHR is ideally done using the EOS® imaging system or, if not available, with conventional lumbopelvic lateral radiographs.By pre-operatively screening patients with abnormal SHR, it is possible to refine total hip replacement (THR) surgical planning, which may improve outcomes.An important component of the concept of kinematically aligned total hip arthroplasty (KA THA) consists of defining the optimal acetabular cup design and orientation based on the assessment of an individual's SHR, and use of the transverse acetabular ligament to adjust the cup positioning...
February 2018: EFORT Open Reviews
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