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Kinematic alignment

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https://www.readbyqxmd.com/read/27912154/limb-dominance-foot-orientation-and-functional-asymmetry-during-walking-gait
#1
John D Polk, Rebecca M Stumpf, Karl S Rosengren
While healthy gait is often characterized as, or assumed to be symmetric, consistent asymmetries often exist. In this study, we test the hypotheses that asymmetries in lower limb function, as measured by ground reaction force characteristics, may be explained by differences in foot orientation or limb dominance. Peak ground reaction force (GRF) measurements, and impulses were obtained for thirty-six healthy subjects with simultaneous kinematic estimates of foot posture. Three gait tasks were performed: subjects walked i) with normal foot orientation, ii) with feet laterally rotated (outward), and iii) with feet aligned in the direction of movement (straight)...
November 18, 2016: Gait & Posture
https://www.readbyqxmd.com/read/27902635/correlation-between-transverse-plan-kinematics-and-foot-progression-angle-in-children-with-spastic-diplegia
#2
Ana Presedo, Anne-Laure Simon, Cindy Mallet, Brice Ilharreborde, Keyvan Mazda, Georges-François Pennecot
In diplegic patients, the orientation of foot progression depends on multiple factors. We investigated the relationship between foot progression alignment, hip and pelvic rotations during gait, femoral anteversion, and tibial torsion. Kinematic and clinical parameters were evaluated for 114 children who walked independently and had not undergone previous surgery. Causes of intoeing presented combined in 72% of cases. Internal foot progression correlated with internal hip rotation and showed an inverse correlation with tibial torsion...
November 29, 2016: Journal of Pediatric Orthopedics. Part B
https://www.readbyqxmd.com/read/27900510/does-a-positioning-rod-or-a-patient-specific-guide-result-in-more-natural-femoral-flexion-in-the-concept-of-kinematically-aligned-total-knee-arthroplasty
#3
Max Ettinger, Tilman Calliess, Stephen M Howell
PURPOSE: Flexion of the femoral component in 5° increments downsizes the femoral component, decreases the proximal reach and surface area of the trochlea, delays the engagement of the patella during flexion, and is associated with a higher risk of patellar-femoral instability after kinematically aligned TKA. The present study evaluated flexion of the femoral component after use of two kinematic alignment instrumentation systems. We determined whether a distal cutting block attached to a positioning rod inserted perpendicular to the distal femoral joint line in the axial plane and 8-10 cm into the distal femur anterior and posterior to the distal cortex of the femur in the sagittal plane or a femoral patient-specific cutting guide sets the femoral component in more natural flexion...
November 29, 2016: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/27895518/single-leg-squats-can-predict-leg-alignment-in-dancers-performing-ballet-movements-in-turnout
#4
Luke S Hopper, Nahoko Sato, Andries L Weidemann
The physical assessments used in dance injury surveillance programs are often adapted from the sports and exercise domain. Bespoke physical assessments may be required for dance, particularly when ballet movements involve "turning out" or external rotation of the legs beyond that typically used in sports. This study evaluated the ability of the traditional single-leg squat to predict the leg alignment of dancers performing ballet movements with turnout. Three-dimensional kinematic data of dancers performing the single-leg squat and five ballet movements were recorded and analyzed...
2016: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/27895052/evidence-toads-may-modulate-landing-preparation-without-predicting-impact-time
#5
S M Cox, Gary Gillis
Within anurans (frogs and toads), cane toads (Bufo marinus) perform particularly controlled landings in which the forelimbs are exclusively used to decelerate and stabilize the body after impact. Here we explore how toads achieve dynamic stability across a wide range of landing conditions. Specifically, we suggest that torques during landing could be reduced by aligning forelimbs with the body's instantaneous velocity vector at impact (impact angle). To test whether toad forelimb orientation varies with landing conditions, we used high-speed video to collect forelimb and body kinematic data from six animals hopping off platforms of different heights (0, 5 and 9 cm)...
November 28, 2016: Biology Open
https://www.readbyqxmd.com/read/27884141/normal-patellofemoral-kinematic-patterns-during-daily-activities-in-dogs
#6
Erica J Moore, Stanley E Kim, Scott A Banks, Antonio Pozzi, Jason D Coggeshall, Stephen C Jones
BACKGROUND: Patellar abnormalities are a common cause of pain and lameness in dogs; however, in vivo the relative motion between the femur and patella in dogs is not well described. The objective of this study was to define normal in vivo sagittal plane patellofemoral kinematics in three axes of motion using non-invasive methods. We hypothesized patellofemoral alignment in the sagittal plane would tightly correlate with the femorotibial flexion angle. Six healthy dogs without orthopedic disease underwent computed tomography (CT) of their hind limbs to create 3-D models of the patella and femur...
November 25, 2016: BMC Veterinary Research
https://www.readbyqxmd.com/read/27884055/the-association-of-forefoot-varus-deformity-with-patellofemoral-cartilage-damage-in-older-adult-cadavers
#7
Rebecca S Lufler, Joshua J Stefanik, Jingbo Niu, F Kip Sawyer, Todd M Hoagland, K Douglas Gross
INTRODUCTION: Forefoot alignment may contribute to patellofemoral joint (PFJ) osteoarthritis (OA) via its influence on the closed chain kinematics of the lower limb. The purpose of this cadaveric study was to investigate the relationship between forefoot varus and ipsilateral cartilage damage in the medial and lateral PFJ. MATERIALS AND METHODS: Forefoot alignment measurements were obtained from the feet of 25 cadavers (n=50). Cartilage damage in the medial and lateral PFJ of each knee was scored using the Outerbridge scale...
November 24, 2016: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/27877028/efficacy-of-a-trunk-orthosis-with-joints-providing-resistive-force-on-low-back-load-during-level-walking-in-elderly-persons
#8
Junji Katsuhira, Ko Matsudaira, Hiroyuki Oka, Shinno Iijima, Akihiro Ito, Tadashi Yasui, Arito Yozu
PURPOSE: The effects of lumbosacral and spinal orthoses on low back pain and gait are not exactly clear. We previously developed a trunk orthosis with joints providing resistive force on low back load to decrease such load, and confirmed its positive effects during level walking in healthy young adults. Therefore, we aimed to determine the efficacy of this trunk orthosis during level walking in healthy elderly subjects. METHODS: Fifteen community-dwelling elderly subjects performed level walking at a self-selected speed without an orthosis, with our orthosis, and with a lumbosacral orthosis...
2016: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/27861541/accuracy-and-reliability-of-the-kinect-version-2-for-clinical-measurement-of-motor-function
#9
Karen Otte, Bastian Kayser, Sebastian Mansow-Model, Julius Verrel, Friedemann Paul, Alexander U Brandt, Tanja Schmitz-Hübsch
BACKGROUND: The introduction of low cost optical 3D motion tracking sensors provides new options for effective quantification of motor dysfunction. OBJECTIVE: The present study aimed to evaluate the Kinect V2 sensor against a gold standard motion capture system with respect to accuracy of tracked landmark movements and accuracy and repeatability of derived clinical parameters. METHODS: Nineteen healthy subjects were concurrently recorded with a Kinect V2 sensor and an optical motion tracking system (Vicon)...
2016: PloS One
https://www.readbyqxmd.com/read/27857485/kinematic-alignment-in-total-knee-arthroplasty-does-it-really-matter
#10
EDITORIAL
Raju Karuppal
No abstract text is available yet for this article.
December 2016: Journal of Orthopaedics
https://www.readbyqxmd.com/read/27832413/editor-s-spotlight-take-5-the-chitranjan-s-ranawat-award-no-difference-in-2-year-functional-outcomes-using-kinematic-versus-mechanical-alignment-in-tka-a-randomized-controlled-clinical-trial
#11
EDITORIAL
https://www.readbyqxmd.com/read/27825214/experimental-testing-of-ab-initio-potential-energy-surfaces-stereodynamics-of-no-a-2-%C3%AE-ne-inelastic-scattering-at-multiple-collision-energies
#12
Thomas F M Luxford, Thomas R Sharples, Kenneth G McKendrick, Matthew L Costen
We present a crossed molecular beam velocity-map ion imaging study of state-to-state rotational energy transfer of NO(A(2)Σ(+), v = 0, N = 0, j = 0.5) in collisions with Ne atoms. From these measurements, we report differential cross sections and angle-resolved rotational angular momentum alignment moments for product states N' = 3 and 5-10 for collisions at an average energy of 523 cm(-1), and N' = 3 and 5-14 for collisions at an average energy of 1309 cm(-1), respectively. The experimental results are compared to the results of close-coupled quantum scattering calculations on two literature ab initio potential energy surfaces (PESs) [Pajón-Suárez et al...
November 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27810436/different-optimal-alignment-but-equivalent-functional-outcomes-in-medial-and-lateral-unicompartmental-knee-arthroplasty
#13
Jelle P van der List, Harshvardhan Chawla, Jordan C Villa, Andrew D Pearle
INTRODUCTION: Several differences in kinematics, functional outcomes and alignment exist between medial and lateral unicompartmental knee arthroplasty (UKA). Therefore, the purpose of this study was (1) to compare functional outcomes between both procedures with the hypothesis that both have equivalent outcomes and (2) to assess the role of preoperative and postoperative alignment on functional outcomes in both procedures. METHODS: Patients who underwent UKA were included when overall function - using Western Ontario and McMaster Universities Arthritis (WOMAC) score - and joint awareness - using Forgotten Joint Score (FJS) - were available preoperatively and at minimum two-year follow-up...
October 31, 2016: Knee
https://www.readbyqxmd.com/read/27797530/theory-and-simulation-of-cholesteric-film-formation-flows-of-dilute-collagen-solutions
#14
O F Aguilar Gutierrez, Alejandro D Rey
Dilute isotropic collagen solutions are usually flow processed into monodomain chiral nematic thin films for obtaining highly ordered materials by a multistep process that starts with complex inhomogeneous flow kinematics. Here we present rigorous theory and simulation of the initial precursors during flow steps in cholesteric collagen film formation. We first extract the molecular shape parameter and rotational diffusivity from previously reported simple shear data of dilute collagen solutions, where the former leads the reactive parameter (tumbling function) which determines the net effect of vorticity and strain rate on the average orientation and where the latter establishes the intensity of strain required for flow-birefringence, both crucial quantities for controlled film formation flow...
October 31, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27792950/hallux-valgus-surgery-affects-kinematic-parameters-during-gait
#15
Jitka Klugarova, Miroslav Janura, Zdenek Svoboda, Zdenek Sos, Nicholas Stergiou, Miloslav Klugar
BACKGROUND: The aim of our study was to compare spatiotemporal parameters and lower limb and pelvis kinematics during the walking in patients with hallux valgus before and after surgery and in relation to a control group. METHODS: Seventeen females with hallux valgus, who underwent first metatarsal osteotomy, constituted our experimental group. The control group consisted of thirteen females. Kinematic data during walking were obtained using the Vicon MX system...
October 6, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27769514/characterizing-fluoroscopy-based-kinematic-accuracy-as-a-function-of-pulse-width-and-velocity
#16
Arin M Ellingson, Joseph D Mozingo, Dixon J Magnuson, Mark W Pagnano, Kristin D Zhao
Fluoroscopic imaging has become increasingly popular to investigate total knee arthroplasty kinematics non-invasively - 3D implant models are aligned with 2D image projections, and optimized via an edge-contour alignment technique. Previous studies have quantified the accuracy of this approach, however they do not always adequately address the impact of image collection parameters. A particularly sensitive parameter is the pulse width, or exposure time per frame. At longer pulse widths, more motion is captured in a single frame; this can lead to image blur and subsequent degradation to image edge quality...
October 11, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27727048/inter-segmental-motions-of-the-foot-in-healthy-adults-gender-difference
#17
Dong Yeon Lee, Sang Gyo Seo, Eo Jin Kim, Sung Ju Kim, Kyoung Min Lee, In Ho Choi
BACKGROUND: Multi-segment Foot Models (MFM) have increased in use for both clinical and research applications; however, little is known about the gender differences of inter-segmental motions within the foot and ankle during gait. The objectives of this study were to analyze the gender differences of inter-segmental foot motion during gait in healthy young adults using a MFM with a 15-marker set. METHODS: One hundred healthy adults (50 males, 50 females) between 20 and 35 years of age who had normal function and no radiographic abnormality, were evaluated...
October 7, 2016: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/27722471/flow-of-wormlike-micellar-solutions-around-confined-microfluidic-cylinders
#18
Ya Zhao, Amy Q Shen, Simon J Haward
Wormlike micellar (WLM) solutions are frequently used in enhanced oil and gas recovery applications in porous rock beds where complex microscopic geometries result in mixed flow kinematics with strong shear and extensional components. Experiments with WLM solutions through model microfluidic porous media have revealed a variety of complex flow phenomena, including the formation of stable gel-like structures known as a Flow-Induced Structured Phase (FISP), which undoubtedly play an important role in applications of WLM fluids, but are still poorly understood...
September 23, 2016: Soft Matter
https://www.readbyqxmd.com/read/27714451/kinematic-femoral-alignment-with-gap-balancing-and-patient-specific-instrumentation-in-total-knee-arthroplasty-a-randomized-clinical-trial
#19
Hagen Hommel, Matthew P Abdel, Carsten Perka
While patient-specific instrumentation (PSI) in total knee arthroplasty (TKA) allows for transfer of the preoperative plan onto bony landmarks, the soft tissue balancing is not affected. The goals of this randomized clinical trial were to compare PSI and the measured resection technique (conventional) with PSI and the gap balancing technique. Fifty patients were randomized to TKA with conventional PSI (PSI-S) (n = 25) or to PSI with additional gap balancing (PSI-GB) (n = 25). All patients were clinically examined at 3 and 12 months postoperatively...
October 6, 2016: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/27714437/dynamic-knee-behaviour-does-the-knee-deformity-change-as-it-is-flexed-an-assessment-and-classification-with-computer-navigation
#20
Kamal Deep, Frederic Picard, Joseph Baines
PURPOSE: The aim of this study was to assess the kinematics of arthritic knees prior to TKA. The hypothesis was that the arthritic knee follows distinct patterns with regard to deformity in coronal plane as it flexes from extended position. METHOD: Data from 585 consecutive arthritic knees that had undergone TKA using two non-image-based navigation systems were included in the study. Coronal plane alignment given by the femoro-tibial mechanical angle (FTMA) was recorded in extension, 30°, 60°, 90° and maximum flexion prior to making any bony cuts or ligamentous releases...
October 6, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
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