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Sagittal balance

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https://www.readbyqxmd.com/read/28918002/effect-of-natural-sagittal-trunk-lean-on-standing-balance-in-untreated-scoliotic-girls
#1
Sébastien Leteneur, Émilie Simoneau-Buessinger, Franck Barbier, Charles-Hilaire Rivard, Paul Allard
BACKGROUND: Generally, scoliotic girls have a tendency to lean further back than a comparable group of non-scoliotic girls. To date, no study has addressed how standing balance in untreated scoliotic girls is affected by a natural backwardly or forwardly inclined trunk. METHODS: 27 able-bodied young girls and 27 young girls with a right thoracic curve were classified as leaning forward or backward according to the median of their trunk sagittal inclination. Participants stood upright barefoot...
September 6, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28894683/beyond-pelvic-incidence-lumbar-lordosis-mismatch-the-importance-of-assessing-the-entire-spine-to-achieve-global-sagittal-alignment
#2
Robert K Merrill, Jun S Kim, Dante M Leven, Joung Heon Kim, Samuel K Cho
STUDY DESIGN: Retrospective case series. OBJECTIVE: To investigate which sagittal parameters contribute to a normal sagittal vertical axis (SVA) when there is a pelvic incidence-lumbar lordosis (PI-LL) mismatch >10° following adult spinal deformity (ASD) correction. METHODS: We performed a retrospective review of ASD patients with >5 levels fused. Sagittal measurements between cohorts of postoperative PI-LL >10° and PI-LL<10° were compared...
September 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28889983/analysing-the-change-of-sagittal-balance-in-patients-with-lenke-5-idiopathic-scoliosis
#3
Okan Ozkunt, Gökhan Karademir, Kerim Sariyilmaz, Halil Can Gemalmaz, Fatih Dikici, Unsal Domanic
OBJECTIVE: The aim of this study was to evaluate preoperative and postoperative spinopelvic parameters and the influence of lowest instrumented vertebrae on sagittal parameters in Lenke 5 Adolescent Idiopathic Scoliosis (AIS) patients. METHODS: A total of 42 patients (37 females, 5 males; mean age: 16.71 ± 3.46 years) were included in the study. Preoperative and postoperative last follow up lumbar lordosis (LL), thoracic kyphosis (TK), pelvic tilt (PT), pelvic incidence (PI) and sacral slope (SS) angles measured...
September 7, 2017: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/28885292/incidence-and-risk-factors-of-anterior-arch-fracture-of-the-atlas-following-c1-laminectomy-without-fusion
#4
Takayoshi Shimizu, Bungo Otsuki, Shunsuke Fujibayashi, Shinji Kumamoto, Yasukazu Hijikata, Yu Shimizu, Mitsuru Takemoto, Masato Ota, Hideo Ito, Shuichi Matsuda
STUDY DESIGN: A retrospective multi-center study OBJECTIVE.: To identify the incidence of anterior arch fracture (AAF) of the atlas following C1 (first cervical vertebra) laminectomy without fusion, and its risk factors. SUMMARY OF BACKGROUND DATA: C1 laminectomy without fusion is a widely accepted surgical procedure performed to decompress the spinal cord that is compromised at the C1/C2 level, but without instability. Several case series have reported spontaneous AAF following this procedure...
September 6, 2017: Spine
https://www.readbyqxmd.com/read/28881121/the-predictable-factors-of-the-postoperative-kyphotic-change-of-sagittal-alignment-of-the-cervical-spine-after-the-laminoplasty
#5
Jun Seok Lee, Dong Wuk Son, Su Hun Lee, Dong Ha Kim, Sang Weon Lee, Geun Sung Song
OBJECTIVE: Laminoplasty is an effective surgical method for treating cervical degenerative disease. However, postoperative complications such as kyphosis, restriction of neck motion, and instability are often reported. Despite sufficient preoperative lordosis, this procedure often aggravates the lordotic curve of the cervical spine and straightens cervical alignment. Hence, it is important to examine preoperative risk factors associated with postoperative kyphotic alignment changes. Our study aimed to investigate preoperative radiologic parameters associated with kyphotic deformity post laminoplasty...
September 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/28881119/evaluation-of-global-sagittal-balance-in-koreans-adults
#6
Yongjae Cho
OBJECTVIE: The global sagittal postural patterns as characterized by Roussouly classification have been previously described in various ethnicities, there were no studies investigated in Koreans. To analyze the distribution of the global sagittal postural patterns in Korean adults using Roussouly classification, the author prospectively studied. METHODS: 252 asymptomatic Korean adults was recruited. Data was obtained by reviewing the films for each subject. Spinopelvic parameters were measured and sagittal postural patterns were then determined according to Roussouly classification...
September 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/28874968/posterior-only-approach-with-pedicle-screws-for-the-correction-of-scheuermann-s-kyphosis
#7
Adem Cobden, Akif Albayrak, Yalkin Camurcu, Hakan Sofu, Temel Tacal, Mehmet Akif Kaygusuz
STUDY DESIGN: Retrospective study (level of evidence: level 3). PURPOSE: The purpose of this study was to evaluate the clinical and radiological results of the posterior-only approach with pedicle screws for the treatment of Scheuermann's kyphosis (SK). OVERVIEW OF LITERATURE: The correction of SK with instrumentation can be performed using posterior-only or combined anterior-posterior procedures. With the use of all-pedicle screw constructs in spine surgery, the posterior-only approach has become a popular option for the definitive treatment of SK...
August 2017: Asian Spine Journal
https://www.readbyqxmd.com/read/28869812/the-effects-of-prosthetic-foot-stiffness-on-transtibial-amputee-walking-mechanics-and-balance-control-during-turning
#8
Courtney E Shell, Ava D Segal, Glenn K Klute, Richard R Neptune
BACKGROUND: Little evidence exists regarding how prosthesis design characteristics affect performance in tasks that challenge mediolateral balance such as turning. This study assesses the influence of prosthetic foot stiffness on amputee walking mechanics and balance control during a continuous turning task. METHODS: Three-dimensional kinematic and kinetic data were collected from eight unilateral transtibial amputees as they walked overground at self-selected speed clockwise and counterclockwise around a 1-meter circle and along a straight line...
August 15, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28868660/in-vivo-whole-blood-t2-versus-hbo2-calibration-by-modulating-blood-oxygenation-level-in-the-femoral-vein-through-intermittent-cuff-occlusion
#9
Michael C Langham, Ana E Rodríguez-Soto, Nadav Schwartz, Felix W Wehrli
PURPOSE: To investigate the feasibility of estimating calibration constants (K and T2o ) in vivo for converting whole-blood T2 to blood hemoglobin oxygen saturation (HbO2 ) according to the Luz-Meiboom model, 1/T2=1/T2o+K(1-HbO2)2, where K and T2o are relaxivity and transverse relaxation time of fully saturated blood, respectively. METHODS: A range of HbO2 values was achieved in the superficial femoral vein with intermittent cuff occlusion in seven healthy adults (four males) to establish a calibration curve between blood T2 and HbO2 at 1...
September 3, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28861422/is-symmetric-gap-balancing-still-the-gold-standard-in-primary-total-knee-arthroplasty
#10
REVIEW
Salvatore Risitano, Pier Francesco Indelli
A rectangular and symmetrical gap in flexion as well as in extension is mandatory to achieve good outcomes and good long-term results in total knee arthroplasty (TKA) using classical designs. Recently, as showed in several fluoroscopic studies, different modern designs (medial congruent or sagittally stable implants) have been demonstrated to better reproduce the more physiological medial pivoting (MP) biomechanics of the normal knee when compared to classical postero-stabilized (PS) and cruciate-retaining (CR) designs...
August 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28842365/spinal-deformity-changes-in-children-with-long-term-vertical-expandable-prosthetic-titanium-rib-veptr-treatment
#11
Andrea S Gantner, Lena Braunschweig, Konstantinos Tsaknakis, Heiko M Lorenz, Anna K Hell
BACKGROUND CONTEXT: In several studies, vertical expandable prosthetic titanium rib (VEPTR) implants have shown good scoliosis control in children with the longest reported follow-up (f/u) of 3.6 years. For growing rods, recent studies suggest a decreased efficiency of correction starting just after that time. To our knowledge, no long-term results of children with VEPTR treatment are available. PURPOSE: To evaluate spinal deformity in scoliotic children and to investigate correction potential of VEPTR implants at several time points of treatment, particularly after long-term f/u...
August 22, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28835232/full-fusion-of-proximal-thoracic-curve-helps-to-prevent-postoperative-cervical-tilt-in-lenke-type-2-adolescent-idiopathic-scoliosis-patients-with-right-elevated-shoulder
#12
Jun Jiang, Bang-Ping Qian, Yong Qiu, Bin Wang, Yang Yu, Ze-Zhang Zhu
BACKGROUND: To date, no study had reported the phenomenon of deteriorated postoperative cervical tilt in Lenke type 2 adolescent idiopathic scoliosis patients. The purpose of this study is to evaluate the cervical tilt in Lenke type 2 adolescent idiopathic scoliosis patients with right-elevated shoulder treated by either full fusion or partial/non fusion of the proximal thoracic curve. METHODS: A total of 30 Lenke type 2 AIS patients with preoperative right-elevated shoulder underwent posterior spinal instrumentation from 2009 to 2011 were included in this study...
August 23, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28831392/pathoanatomic-risk-factors-for-instability-and-adjacent-segment-disease-in-lumbar-spine-how-to-use-topping-off
#13
REVIEW
J Bredow, L Löhrer, J Oppermann, M J Scheyerer, R Sobottke, P Eysel, J Siewe
PURPOSE: The goal of this review is to identify criteria indicating implantation of hybrid system into lumbar spine and to evaluate general benefits of use. METHODS: A systematic review of literature was performed using current randomized clinical trials, reviews, and meta-analyses. Data sources included relevant literature of human studies identified through searches of Medline Library until May 2015. RESULTS: Predisposing factors for Adjacent Segment Disease (ASDi) are discussed in literature: laminar horizontalization, insufficiency of fascia thoracolumbalis, facet tropism, and facet sagittalization...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28830044/postural-orientation-and-standing-postural-alignment-in-ambulant-children-with-bilateral-cerebral-palsy
#14
Małgorzata Domagalska-Szopa, Andrzej Szopa
BACKGROUND: Standing postural alignment in children with cerebral palsy is usually altered by central postural control disorders. The primary aim of this study is to describe body alignment in a quiet standing position in ambulatory children with bilateral cerebral palsy compared with children with typical development. METHODS: Fifty-eight children with bilateral cerebral palsy (aged 7-13years) and 45 age-matched children with typical development underwent a surface topography examination based on Moiré topography and were classified according to their sagittal postural profiles...
August 16, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28828753/reduction-of-intradiscal-pressure-by-the-use-of-polycarbonate-urethane-rods-as-compared-to-titanium-rods-in-posterior-thoracolumbar-spinal-fixation
#15
Eva Jacobs, Alex K Roth, Jacobus J Arts, Lodewijk W van Rhijn, Paul C Willems
Loss of sagittal alignment and balance in adult spinal deformity can cause severe pain, disability and progressive neurological deficit. When conservative treatment has failed, spinal fusion using rigid instrumentation is currently the salvage treatment to stop further curve progression. However, fusion surgery is associated with high revision rates due to instrumentation failure and proximal junctional failure, especially if patients also suffer from osteoporosis. To address these drawbacks, a less rigid rod construct is proposed, which is hypothesized to provide a more gradual transition of force and load distribution over spinal segments in comparison to stiff titanium rods...
August 21, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28826618/the-morphology-of-sagittal-alignment-in-asymptomatic-volunteers-of-east-china-a-novel-radiological-classification
#16
Mingyuan Yang, Honglei Guo, Xinrui Wang, Shibo Xia, Xiaodong Zhu, Changwei Yang, Ming Li
BACKGROUND: The morphology of sagittal alignment varies in normal population. Sagittal alignment was classified into four subgroups; however, this classification was performed based on senior authors' clinical experiences rather than scientific methods. The objective of this study is to classify the morphology of sagittal alignment in normal population and describe the characteristics of sagittal alignment in each subgroup. METHODS: Medical records of asymptomatic volunteers without known spinal diseases in our outpatient clinic from January 2015 to August 2015 were reviewed...
August 18, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28821443/the-effect-of-pelvic-motion-on-spino-pelvic-parameters
#17
Andrew M Hayden, Ann M Hayes, Jennifer L Brechbuhler, Heidi Israel, Howard M Place
BACKGROUND CONTEXT: To date, many studies have examined how pelvic position affects the spinal curvature and spino-pelvic parameters. However, these studies focus on a static relationship, comparing pelvis and spine in a relaxed or baseline position only. Indeed, the spino-pelvic connection is dynamic, as a subject can easily be taught to rotate their pelvis anteriorly or posteriorly on the femoral head, all while maintaining an erect posture. Therefore, for a true understanding of pelvic influence on the spinal column, it is necessary to examine spino-pelvic parameters in multiple pelvic positions within the same subject...
August 15, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28816947/kinematic-analysis-of-the-relationship-between-modic-changes-and-sagittal-balance-parameters-in-the-cervical-spine
#18
Zikun Ma, Peng Liu, Jingpei Liu, Jianhui Mou, Zhaolin Wang, Dong Sun, Jie Cheng, Dengwei Zhang, Jianlin Xiao
The aim of this study is to investigate the relationship between the Modic changes (MCs) and sagittal parameters of the cervical spine.We conducted a retrospective review of 100 outpatients with magnetic resonance imaging (MRI) scans of the cervical spine (50 male and 50 female). MRI parameters were measured, including neck tilt, T1 slope (T1 ), thoracic inlet angle (TIA), and cervical lordosis (CL: Cobb C2-7). Patients were divided into 4 groups according to the presence or absence of MC and T1s, respectively: MC(+) and MC(-) groups, as well as H-T1s (T1s ≥25°) and L-T1s subgroups (T1s <25°)...
August 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28815157/a-levering-technique-using-small-parallel-rods-for-open-reduction-of-high-grade-thoracolumbar-dislocation
#19
Shailesh Hadgaonkar, Kunal Shah, Ketan Khurjekar, Vibhu Krishnan, Ashok Shyam, Parag Sancheti
STUDY DESIGN: Technical report. OBJECTIVE: Dorsolumbar vertebral dislocations, with or without associated fractures, occur secondary to very high velocity trauma. The reduction procedures and techniques, which may be adopted in these situations, have been multifariously discussed in the literature. Our objective was to assess the outcome of a novel reduction maneuver, using parallel rods which we have employed in reduction of high-grade thoracolumbar fractures to achieve precise sagittal balance as well as accurate vertebral alignment with minimal soft tissue damage...
June 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28814050/segmental-contributions-to-sagittal-plane-whole-body-angular-momentum-when-using-powered-compared-to-passive-ankle-foot-prostheses-on-ramps
#20
Nathaniel T Pickle, Anne K Silverman, Jason M Wilken, Nicholas P Fey
Understanding the effects of an assistive device on dynamic balance is crucial, particularly for robotic leg prostheses. Analyses of dynamic balance commonly evaluate the range of whole-body angular momentum (H). However, the contributions of individual body segments to overall H throughout gait may yield futher insights, specifically for people with transtibial amputation using powered prostheses. We evaluated segment contributions to H using Statistical Parametric Mapping to assess the effects of prosthesis type (powered vs passive) and ramp angle on segmental coordination...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
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