keyword
MENU ▼
Read by QxMD icon Read
search

Kinematic alignment

keyword
https://www.readbyqxmd.com/read/28077396/the-effects-of-kinematically-aligned-total-knee-arthroplasty-on-stress-at-the-medial-tibia-a-case-study-for-varus-knee
#1
S Nakamura, Y Tian, Y Tanaka, S Kuriyama, H Ito, M Furu, S Matsuda
OBJECTIVES: Little biomechanical information is available about kinematically aligned (KA) total knee arthroplasty (TKA). The purpose of this study was to simulate the kinematics and kinetics after KA TKA and mechanically aligned (MA) TKA with four different limb alignments. MATERIALS AND METHODS: Bone models were constructed from one volunteer (normal) and three patients with three different knee deformities (slight, moderate and severe varus). A dynamic musculoskeletal modelling system was used to analyse the kinematics and the tibiofemoral contact force...
January 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28072630/bracing-of-the-reconstructed-and-osteoarthritic-knee-during-high-dynamic-load-tasks
#2
Harvi F Hart, Kay M Crossley, Natalie J Collins, David C Ackland
PURPOSE: Lateral compartment osteoarthritis accompanied by abnormal knee biomechanics are frequently reported in individuals with knee osteoarthritis after anterior cruciate ligament reconstruction (ACLR). The aim of this study was to evaluate changes in knee biomechanics produced by an adjusted and unadjusted varus knee brace during high dynamic loading activities in individuals with lateral knee osteoarthritis after ACLR and valgus malalignment. METHODS: Nineteen participants who had undergone ACLR 5 to 20 years previously and had symptomatic and radiographic lateral knee osteoarthritis with valgus malalignment were assessed...
January 9, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28060814/glenohumeral-joint-kinematics-following-clavicular-fracture-and-repairs
#3
Claudio Rosso, Michael Nasr, Kempland C Walley, Ethan R Harlow, Babak Haghpanah, Ashkan Vaziri, Arun J Ramappa, Ara Nazarian, Joseph P DeAngelis
BACKGROUND: The purpose of this biomechanical study was to determine the effect of shortened clavicle malunion on the center of rotation of the glenohumeral (GH) joint, and the capacity of repair to restore baseline kinematics. METHODS: Six shoulders underwent automated abduction (ABD) and abbreviated throwing motion (ATM) using a 7-DoF automated upper extremity testing system in combination with an infrared motion capture system to measure the center of rotation of the GH joint...
2017: PloS One
https://www.readbyqxmd.com/read/28057348/lower-extremity-control-during-turns-initiated-with-and-without-hip-external-rotation
#4
Antonia M Zaferiou, Henryk Flashner, Rand R Wilcox, Jill L McNitt-Gray
The pirouette turn is often initiated in neutral and externally rotated hip positions by dancers. This provides an opportunity to investigate how dancers satisfy the same mechanical objectives at the whole-body level when using different leg kinematics. The purpose of this study was to compare lower extremity control strategies during the turn initiation phase of pirouettes performed with and without hip external rotation. Skilled dancers (n=5) performed pirouette turns with and without hip external rotation...
December 29, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28049316/system-size-dependence-of-the-structure-and-rheology-in-a-sheared-lamellar-liquid-crystalline-medium
#5
S J Jaju, V Kumaran
The structural and rheological evolution of an initially disordered lamellar phase system under a shear flow is examined using a mesoscale model based on a free energy functional for the concentration field, which is the scaled difference in the concentration between the hydrophilic and hydrophobic components. The dimensionless numbers which affect the shear evolution are the Reynolds number (γ˙¯L(2)/ν), the Schmidt number (ν/D), a dimensionless parameter Σ=(Aλ(2)/ρν(2)), a parameter μr which represents the viscosity contrast between the hydrophilic and hydrophobic components, and (L/λ), the ratio of system size and layer spacing...
December 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28039023/determination-of-the-accuracy-of-navigated-kinematic-unicompartmental-knee-arthroplasty-a-2-year-follow-up
#6
Andrea L Grant, Kenji D Doma, Kaushik Hazratwala
BACKGROUND: Unicompartmental knee arthroplasty (UKA) lacks history of patient satisfaction and research addressing technique validity. The aim of this study was to determine minimally invasive navigated kinematic UKA accuracy by comparing postoperative limb alignment with preoperative stress values. METHODS: A single-center retrospective study was conducted on 53 consecutive patients (postoperative alignment: varus n = 51, valgus n = 2) who underwent computer navigation assisted UKA...
November 29, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28033053/the-effect-of-walking-speed-on-foot-kinematics-is-modified-when-increased-pronation-is-induced
#7
Joana F Hornestam, Thales R Souza, Paula Arantes, Juliana Ocarino, Paula L Silva
BACKGROUND: The relation between walking speed and foot kinematics during gait is not well established, and neither is it clear whether this relation is modified in the presence of factors expected to increase pronation (eg, abnormal foot alignment). Understanding how foot kinematics is affected by walking speed under varying conditions could contribute to our understanding of stresses to the musculoskeletal system during walking. We evaluated the effect of walking speed on foot kinematics in the frontal plane during gait and determined whether this effect is modified by using medially inclined insoles that force the foot into increased pronation...
November 2016: Journal of the American Podiatric Medical Association
https://www.readbyqxmd.com/read/28029800/patellofemoral-kinematics-and-tibial-tuberosity-trochlear-groove-distances-in-female-adolescents-with-patellofemoral-pain
#8
Victor R Carlson, Barry P Boden, Frances T Sheehan
BACKGROUND: Patellofemoral pain (PFP) is a prevalent disorder among female adolescents. Overuse is frequently cited as the cause of pain for this population. What is currently unclear, however, is if the patella demonstrates abnormal tracking patterns relative to the femoral trochlear groove in female adolescents with PFP. PURPOSE: The aim of this case-control study was to determine if abnormal patellar tracking patterns are present in female adolescents with PFP...
December 1, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28026778/proactive-selective-inhibition-targeted-at-the-neck-muscles-this-proximal-constraint-facilitates-learning-and-regulates-global-control
#9
Ian Loram, Brian Bate, Peter Harding, Ryan Cunningham, Alison Loram
While individual muscle function is known, the sensory and motor value of muscles within the whole-body sensorimotor network is complicated. Specifically, the relationship between neck muscle action and distal muscle synergies is unknown. This work demonstrates a causal relationship between regulation of the neck muscles and global motor control. Studying violinists performing unskilled and skilled manual tasks, we provided ultrasound feedback of the neck muscles with instruction to minimize neck muscle change during task performance and observed the indirect effect on whole-body movement...
December 21, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/27995304/patient-specific-instrumentation-versus-conventional-knee-arthroplasty-comparative-study
#10
Vlad Predescu, Catalin Prescura, Razvan Olaru, Liliana Savin, Paul Botez, Bogdan Deleanu
BACKGROUND: The key to a successful knee replacement is restoring normal kinematics with a neutral alignment, thus a hip-knee-ankle (HKA) angle of 180° (within 3° limits). Conventional TKR is proven to have excellent results but relies in extensive visual referencing of bony landmarks. Customised cutting blocks provide accurate bone cuts, also lowering the risk of fat embolism, blood loss and operating time. METHOD: We share our experience comparing two different TKA techniques using patient specific instrumentation (PSI) with the Visionaire knee and conventional instrumentation (CVI) from the same system (Genesis II Smith&Nephew)...
December 19, 2016: International Orthopaedics
https://www.readbyqxmd.com/read/27992350/alignment-free-self-calibrating-elbow-angles-measurement-using-inertial-sensors
#11
Philipp Muller, Marc-Andre Begin, Thomas Schauer, Thomas Seel
Due to their relative ease of handling and low cost, inertial measurement unit (IMU)-based joint angle measurements are used for a widespread range of applications. These include sports performance, gait analysis and rehabilitation (e.g. Parkinson's disease monitoring or post-stroke assessment). However, a major downside of current algorithms, recomposing human kinematics from IMU data, is that they require calibration motions and/or the careful alignment of the IMUs with respect to the body segments. In this article, we propose a new method, which is alignment-free and self-calibrating using arbitrary movements of the user and an initial zero reference arm pose...
December 14, 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/27989384/evaluation-of-predicted-knee-function-for-component-malrotation-in-total-knee-arthroplasty
#12
Valentine Vanheule, Hendrik Pieter Delport, Michael Skipper Andersen, Lennart Scheys, Roel Wirix-Speetjens, Ilse Jonkers, Jan Victor, Jos Vander Sloten
Soft-tissue balancing for total knee arthroplasty (TKA) remains subjective and highly dependent on surgical expertise. Pre-operative planning may support the clinician in taking decisions by integrating subject-specific computer models that predict functional outcome. However, validation of these models is essential before they can be applied in clinical practice. The aim of this study was to evaluate a knee modelling workflow by comparing experimental cadaveric measures to model-based kinematics and ligament length changes...
December 15, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27987299/an-improved-tibial-force-sensor-to-compute-contact-force-and-contact-location-in-vitro-after-total-knee-arthroplasty
#13
Joshua D Roth, Stephen M Howell, Maury L Hull
Contact force imbalance and contact kinematics (i.e. motion of the contact location in each compartment during flexion) of the tibiofemoral joint are both important predictors of a patient's outcome following total knee arthroplasty (TKA). Previous tibial force sensors (TFS) have limitations in that they either did not determine contact force and contact location independently in the medial and lateral compartments or only did so within restricted areas of the tibial insert, which prevented them from thoroughly evaluating contact force imbalance and contact kinematics in vitro...
December 17, 2016: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/27939351/prescribing-joint-co-ordinates-during-model-preparation-to-improve-inverse-kinematic-estimates-of-elbow-joint-angles
#14
D J M Wells, J A Alderson, J Dunne, B C Elliott, C J Donnelly
To appropriately use inverse kinematic (IK) modelling for the assessment of human motion, a musculoskeletal model must be prepared 1) to match participant segment lengths (scaling) and 2) to align the model׳s virtual markers positions with known, experimentally derived kinematic marker positions (marker registration). The purpose of this study was to investigate whether prescribing joint co-ordinates during the marker registration process (within the modelling framework OpenSim) will improve IK derived elbow kinematics during an overhead sporting task...
January 25, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/27923062/the-kinematics-of-plant-nutation-reveals-a-simple-relation-between-curvature-and-the-orientation-of-differential-growth
#15
Renaud Bastien, Yasmine Meroz
Nutation is an oscillatory movement that plants display during their development. Despite its ubiquity among plants movements, the relation between the observed movement and the underlying biological mechanisms remains unclear. Here we show that the kinematics of the full organ in 3D give a simple picture of plant nutation, where the orientation of the curvature along the main axis of the organ aligns with the direction of maximal differential growth. Within this framework we reexamine the validity of widely used experimental measurements of the apical tip as markers of growth dynamics...
December 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27923050/the-effect-of-alignment-changes-on-unilateral-transtibial-amputee-s-gait-a-systematic-review
#16
Niels Jonkergouw, Maarten R Prins, Arjan W P Buis, Peter van der Wurff
INTRODUCTION: Prosthetic alignment, positioning of a prosthetic foot relative to a socket, is an iterative process in which an amputee's gait is optimized through repetitive optical gait observation and induction of alignment adjustments when deviations are detected in spatiotemporal and kinematic gait parameters. An important limitation of the current prosthetic alignment approach is the subjectivity and the lack of standardized quantifiable baseline values. The purpose of this systematic review is to investigate if an optimal alignment criterion can be derived from published articles...
2016: PloS One
https://www.readbyqxmd.com/read/27918696/validation-of-inertial-measurement-units-for-upper-body-kinematics
#17
Melissa M B Morrow, Bethany Lowndes, Emma Fortune, Kenton R Kaufman, Susan Hallbeck
The purpose of this study was to validate a commercially available IMU system against a standard lab-based motion capture system for the measurement of shoulder elevation, elbow flexion, trunk flexion/extension and neck flexion/extension kinematics. The validation analyses were applied to six surgical faculty members performing a standard, simulated surgical training task that mimics minimally invasive surgery. Three-dimensional joint kinematics were simultaneously recorded by an optical motion capture system and an IMU system with six sensors placed on the head, chest, and bilateral upper and lower arms...
December 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27912154/limb-dominance-foot-orientation-and-functional-asymmetry-during-walking-gait
#18
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
#19
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
#20
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...
January 2017: Archives of Orthopaedic and Trauma Surgery
keyword
keyword
114854
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"