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https://www.readbyqxmd.com/read/28712802/efficacy-of-a-pelvic-lateral-positioner-with-a-mechanical-cup-navigator-based-on-the-anatomical-pelvic-plane-in-total-hip-arthroplasty
#1
Kentaro Iwakiri, Akio Kobayashi, Yoichi Ohta, Yukihide Minoda, Kunio Takaoka, Hiroaki Nakamura
BACKGROUND: The acetabular component orientation in total hip arthroplasty (THA) is of critical importance to the good clinical results. However, traditional widely used cup alignment guides for cup placement are reported to be relatively unreliable. The present study aims at comparing a novel cup alignment guide, which can be attached to our anatomical pelvic plane (APP) pelvic lateral positioner for reducing discrepancies in sagittal pelvic tilt and indicate a targeted cup angle based on the APP, with a conventional cup alignment guide...
June 27, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28712801/the-effect-of-pelvic-tilt-and-femoral-head-size-on-hip-range-of-motion-to-impingement
#2
Thomas F McCarthy, Jim Nevelos, Randa K Elmallah, Morad Chughtai, Anton Khlopas, Vincent Alipit, Timothy C Wagner, Michael A Mont
BACKGROUND: About 50%-70% of dislocators have cups placed within so-called "safe zones." It has been postulated that factors such as femoral head size and pelvic tilt, obliquity, or rotation may influence postoperative stability. Therefore, we assessed varying degrees of pelvic tilt and head sizes on the range of motion (ROM) to impingement. METHODS: A hip simulator was used to import models of 10 subjects who performed object pickup, squatting, and low-chair rising...
June 15, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28709947/combination-of-whole-spine-lateral-radiograph-and-lateral-scanogram-in-the-assessment-of-global-sagittal-balance
#3
Chang-Hoon Jeon, Kyu-Sung Kwack, Sunghoon Park, Han-Dong Lee, Nam-Su Chung
BACKGROUND CONTEXT: Global balance of human standing is analyzed as the geometric sum of the individual alignments extending from the spinal column to the pelvis, and to the lower limbs. The innovative EOS system has opened new perspectives for the global analysis of whole body alignment, but its use is very limited due to its high cost. An alternative may be to combine the whole spine lateral radiograph and the lateral scanogram in the global sagittal analysis of whole body alignment...
July 11, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28707133/changes-of-spinopelvic-parameters-in-different-positions
#4
Soo-An Park, Dai-Soon Kwak, Ho-Jung Cho, Dong-Uk Min
INTRODUCTION: To observe changes of spinopelvic parameters and the presence of pelvic incidence (PI) variation in different positions, and the accuracy of PI compared with CT scan. MATERIALS AND METHODS: Patients with standing whole-spine radiograph, CT scan of the pelvic bone, and MRI of the lumbar spine done within a few days were included. The pelvic [pelvic tilt (PT), sacral slope (SS), and PI] and spinal [lumbar lordosis (LL)] parameters were measured by two different observers...
July 13, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28698940/radiological-outcome-of-postoperative-sagittal-balance-on-standing-radiographs-in-comparison-to-intraoperative-radiographs-in-prone-position-when-performing-lumbar-spinal-fusion
#5
Felix Greimel, Stefanie Wolkerstorfer, Jan-Frederik Spörrer, Florian Zeman, Patrick Hoffstetter, Joachim Grifka, Achim Benditz
PURPOSE: Aim of this study is to show the outcome of postoperatively measured lumbar lordosis in upright position in comparison to the intraoperatively estimated lumbar lordosis in prone position, as the lumbar lordosis is one of the most important factors for the clinical outcome after spinal fusion. MATERIALS AND METHODS: Eighty-two patients, receiving lumbar fusion were included in this retrospective study. Intraoperative radiographs were scanned. Then radiographs of the whole spine pre- and postoperatively, as well as 1 year after surgery were measured by a spine surgeon and a radiologist...
July 11, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28697862/acetabular-and-femoral-anteversions-in-standing-position-are-outside-the-proposed-safe-zone-after-total-hip-arthroplasty
#6
Jean Y Lazennec, Frederic Thauron, Christopher B Robbins, Aidin E Pour
BACKGROUND: Although most hip dislocations occur in either standing or sitting position, the safe zone for implant position is defined for the supine position. Our goal was to determine preoperative and postoperative pelvis and hip orientations and whether the safe zone defined in supine position can be used to assess standing radiographs. METHODS: Preoperative and postoperative three-dimensional EOS images were assessed in 66 total hip arthroplasty patients. None of the patients had dislocation within the follow-up period (12-36 months)...
June 20, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28697529/correction-of-pelvic-tilt-and-pelvic-rotation-in-cup-measurement-after-tha-an-experimental-study
#7
Timo Julian Schwarz, Markus Weber, Christian Dornia, Michael Worlicek, Tobias Renkawitz, Joachim Grifka, Benjamin Craiovan
Purpose Accurate assessment of cup orientation on postoperative pelvic radiographs is essential for evaluating outcome after THA. Here, we present a novel method for correcting measurement inaccuracies due to pelvic tilt and rotation. Method In an experimental setting, a cup was implanted into a dummy pelvis, and its final position was verified via CT. To show the effect of pelvic tilt and rotation on cup position, the dummy was fixed to a rack to achieve a tilt between + 15° anterior and -15° posterior and 0° to 20° rotation to the contralateral side...
July 11, 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/28694216/an-analysis-of-radiographic-parameters-comparison-between-lumbar-spine-latericumbent-and-full-length-lateral-standing-radiographs
#8
Zhiwei Yang, Fang Xie, Jianxin Zhang, Zhuowen Liang, Zhe Wang, Xueyu Hu, Zhuojing Luo
BACKGROUND CONTEXT: The lumbar spine latericumbent and full-length lateral standing radiographs are most commonly used to assess lumbar disorder. However, there are few literatures regarding the difference and correlation of the sagittal parameters between the two shooting positions. PURPOSE: To investigate the difference of sagittal parameters in spine lateral radiographs between latericumbent and upright positions, identify the correlation and establish a preliminary linear fitting formula...
July 7, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28684212/validation-of-a-new-2-d-technique-for-radiographic-wear-measurement-of-cemented-highly-cross-linked-polyethylene-acetabular-cups
#9
Brian Derbyshire, Bilal Barkatali
A new 2-D radiographic wear measurement system has been developed which enables the low wear of highly cross-linked polyethylene acetabular cups to be accurately and precisely measured from standard, pelvis radiographs. The software was validated using radiographic images of a measurement jig which could vary the cup orientation and simulate the effect of pelvic tilt/rotation. Wear was simulated using accurately measured plastic shims to vary the position of the femoral head relative to the cup. The effects of varying "wear" penetration, "wear" direction, cup orientation and X-ray focus position were assessed...
July 3, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28683419/deviating-running-kinematics-and-hamstring-injury-susceptibility-in-male-soccer-players-cause-or-consequence
#10
Joke Schuermans, Damien Van Tiggelen, Tanneke Palmans, Lieven Danneels, Erik Witvrouw
BACKGROUND: Although the vast majority of hamstring injuries in male soccer are sustained during high speed running, the association between sprinting kinematics and hamstring injury vulnerability has never been investigated prospectively in a cohort at risk. PURPOSE: This study aimed to objectify the importance of lower limb and trunk kinematics during full sprint in hamstring injury susceptibility. STUDY DESIGN: Cohort study; level of evidence, 2...
June 27, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28671286/structural-characterization-of-the-nap-the-major-adhesion-complex-of-the-human-pathogen-mycoplasma-genitalium
#11
Margot P Scheffer, Luis Gonzalez-Gonzalez, Anja Seybert, Mercè Ratera, Michael Kunz, José M Valpuesta, Ignacio Fita, Enrique Querol, Jaume Piñol, Jaime Martín-Benito, Achilleas S Frangakis
Mycoplasma genitalium, the causative agent of non-gonococcal urethritis and pelvic inflammatory disease in humans, is a small eubacterium that lacks a peptidoglycan cell wall. On the surface of its plasma membrane is the major surface adhesion complex, known as NAP, that is essential for adhesion and gliding motility of the organism. Here, we have performed cryo-electron tomography of intact cells and detergent permeabilized M. genitalium cell aggregates, providing sub-tomogram averages of free and cell-attached NAPs respectively, revealing a tetrameric complex with two-fold rotational (C2) symmetry...
July 3, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28669858/pelvic-incidence-a-fixed-value-or-can-you-change-it
#12
Howard M Place, Ann M Hayes, Stephen B Huebner, Andy M Hayden, Heidi Israel, Jennifer L Brechbuhler
BACKGROUND CONTEXT: There has been renewed interest in the pelvic vertebrae by spinal surgeons recently. Those involved in working with patients with adult spinal deformity, focus on the position of the fused spine as it relates to the pelvis, and determine success or failure by specific numbers for given pelvic parameters. The pelvic parameters that are commonly measured for these patients are pelvic tilt, sacral slope, and pelvic incidence. Out of the three, pelvic incidence has always been considered to be the fixed measurement, while pelvic tilt and sacral slope have the capacity to change in relation to external forces...
June 29, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28658032/assessment-of-the-change-in-alignment-of-fixed-segment-after-adult-spinal-deformity-surgery
#13
Tomohiro Banno, Tomohiko Hasegawa, Yu Yamato, Sho Kobayashi, Daisuke Togawa, Go Yoshida, Tatsuya Yasuda, Shin Oe, Yuki Mihara, Hiroki Ushirozako, Yukihiro Matsuyama
STUDY DESIGN: Retrospective study OBJECTIVE.: To determine the prevalence of loss in fixed segment alignment after surgical correction of adult spinal deformity (ASD) and identify associated risk factors. SUMMARY OF BACKGROUND DATA: Altered fixed segment alignment influences global spinal alignment; however, associated risk factors have not been determined. METHODS: Data of 63 patients with ASD (55 women; mean age, 68.0 years), who underwent corrective fusion from the lower thoracic spine to the pelvis and completed the 2-year follow-up, were retrospectively analyzed...
June 27, 2017: Spine
https://www.readbyqxmd.com/read/28650879/novel-angular-measures-of-cervical-deformity-account-for-upper-cervical-compensation-and-sagittal-alignment
#14
Themistocles S Protopsaltis, Renaud Lafage, Shaleen Vira, Daniel Sciubba, Alex Soroceanu, Kojo Hamilton, Justin Smith, Peter G Passias, Gregory Mundis, Robert Hart, Frank Schwab, Eric Klineberg, Christopher Shaffrey, Virginie Lafage, Christopher Ames
STUDY DESIGN: This is a retrospective review of a prospective multicenter database. OBJECTIVE: This study introduces 2 new cervical alignment measures accounting for both cervical deformity (CD) and upper cervical compensation. SUMMARY OF BACKGROUND DATA: Current descriptions of CD like the C2-C7 sagittal vertical axis (cSVA) do not account for compensatory mechanisms such as C0-C2 lordosis and pelvic tilt, which makes surgical planning difficult...
June 23, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28641201/pelvic-and-hip-kinematics-during-single-leg-drop-landing-are-altered-in-sports-participants-with-long-standing-groin-pain-a-cross-sectional-study
#15
L Janse van Rensburg, M Dare, Q Louw, L Crous, J Cockroft, L Williams, B Olivier
OBJECTIVES: The aim of this study was to determine the differences in three-dimensional pelvic and hip kinematics during a single-leg drop-landing task in active sports participants with long-standing groin pain compared to healthy matched controls. DESIGN: This was a descriptive study incorporating a cross-sectional design. SETTING: The study was conducted at the Unit for Human Movement Analysis, Stellenbosch University, South Africa. PARTICIPANTS: The study sample was comprised of 20 male club level soccer, rugby, running and cycling participants between the ages of 18 and 55 years...
July 2017: Physical Therapy in Sport
https://www.readbyqxmd.com/read/28632553/lumbar-retrolisthesis-in-aging-spine-what-are-the-associated-factors
#16
Feng Zhu, Hongda Bao, Zhen Liu, Zezhang Zhu, Shouyu He, Yong Qiu
STUDY DESIGN: A retrospective radiographic study. OBJECTIVE: The aim of this study is to demonstrate that lumbar retrolisthesis serves as an important compensatory mechanism and to identify the possible factor related to lumbar retrolisthesis. SUMMARY OF BACKGROUND DATA: Lumbar instability is one of the common degenerative changes, which presents as 2 radiologic features: anterolisthesis and retrolisthesis. Compared with the extensive studies on anterolisthesis, limit data are available on the characteristics and clinical relevance of lumbar retrolisthesis...
July 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28622902/a-critical-analysis-of-sagittal-plane-deformity-correction-with-minimally-invasive-adult-spinal-deformity-surgery-a-2-year-follow-up-study
#17
Gregory M Mundis, Jay D Turner, Vedat Deverin, Juan S Uribe, Pierce Nunley, Praveen Mummaneni, Neel Anand, Paul Park, David O Okonkwo, Michael Y Wang, Shay Bess, Adam S Kanter, Richard Fessler, Stacie Nguyen, Behrooz A Akbarnia
INTRODUCTION: Sagittal plane realignment is important to achieve desirable clinical outcomes after adult spinal deformity (ASD) surgery. This study evaluates the impact of minimally invasive (MIS) techniques on sagittal plane alignment and clinical outcomes in ASD patients. METHODS: A retrospective, multi-center review of ASD patients (age ≥18 years, and with one of the following: coronal Cobb ≥20°, sagittal vertical axis [SVA] >5 cm, and/or pelvic tilt >25°), MIS surgery, and four or more levels instrumented...
July 2017: Spine Deformity
https://www.readbyqxmd.com/read/28622901/tridimensional-analysis-of-rotatory-subluxation-and-sagittal-spinopelvic-alignment-in-the-setting-of-adult-spinal-deformity
#18
Emmanuelle Ferrero, Renaud Lafage, Bassel G Diebo, Vincent Challier, Brice Illharreborde, Frank Schwab, Wafa Skalli, Pierre Guigui, Virginie Lafage
STUDY DESIGN: Retrospective single-center. OBJECTIVE: To investigate rotatory subluxation (RS) in adult spinal deformity (ASD) with three-dimensional (3D) stereoradiographic images and analyze relationships between RS, transverse plane parameters, spinopelvic parameters, and clinical outcomes. BACKGROUND: Recent research has demonstrated that sagittal plane malalignment and listhesis correlate with ASD patient-reported outcomes. However, there is still a lack of knowledge regarding the clinical impact of 3D evaluation and rotatory subluxation...
July 2017: Spine Deformity
https://www.readbyqxmd.com/read/28622899/a-novel-method-for-estimating-three-dimensional-apical-vertebral-rotation-using-two-dimensional-coronal-cobb-angle-and-thoracic-kyphosis
#19
T Barrett Sullivan, Tracey Bastrom, Fredrick Reighard, Megan Jeffords, Peter O Newton
STUDY DESIGN: Retrospective cohort analysis. OBJECTIVES: To use a large cohort of three-dimensional (3D) spinal reconstructions to create a simple mathematical formula capable of estimating 3D apical vertebral rotation (AVR) based on the correlation with routinely obtained two-dimensional (2D) measurements of scoliosis. SUMMARY OF BACKGROUND DATA: Quantification of vertebral rotation in AIS using 2-dimensional (2D) imaging is inherently challenging as the axial plane cannot be directly visualized...
July 2017: Spine Deformity
https://www.readbyqxmd.com/read/28622188/differences-in-fundamental-sagittal-pelvic-parameters-based-on-age-sex-and-race
#20
Robert K Merrill, Jun S Kim, Dante M Leven, Joung Heon Kim, Joshua J Meaike, Rachel S Bronheim, Kelly I Suchman, Doug Nowacki, Sunder S Gidumal, Samuel K Cho
STUDY DESIGN: This is a retrospective cohort study. OBJECTIVE: To determine whether age, sex, and race have independent effects on sagittal pelvic parameters. SUMMARY OF BACKGROUND DATA: Pelvic parameters and sagittal balance correlate with health-related quality of life and are important for patient assessment and surgical planning. Age, sex, and race are 3 unalterable patient factors that may influence pelvic morphology. METHODS: We conducted a retrospective review of consecutive adult patients who presented to our radiology practice between 2010 and 2015 and had a standing, lateral lumbosacral radiograph...
June 15, 2017: Clinical Spine Surgery
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