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Kinematic alignment

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https://www.readbyqxmd.com/read/28516043/quantification-of-regional-deformation-of-the-lungs-by-non-rigid-registration-of-three-dimensional-contrast-enhanced-magnetic-resonance-imaging
#1
Jiaxin Shao, Peng Hu
BACKGROUND: Assessment of lung function is vital for the diagnosis of a variety of pathological conditions. Research has been proposed to study pulmonary mechanics and kinematics using two-dimensional (2D) magnetic resonance imaging (MRI). This allows estimation of regional lung tissue mechanics but is limited to 2D information. An approach based on three-dimensional (3D) contrast-enhanced MR angiogram of pulmonary blood vessels and a non-rigid image registration technique is proposed for quantification of lung regional deformations, which can potentially be used for assessment of pulmonary parenchymal mechanics and regional ventilation for disease diagnosis without ionizing radiation...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28493211/what-mechanisms-are-associated-with-tibial-component-failure-after-kinematically-aligned-total-knee-arthroplasty
#2
Alexander J Nedopil, Stephen M Howell, Maury L Hull
PURPOSE: Eight patients treated with kinematically-aligned (KA) total knee arthroplasty (TKA) presented with tibial component failure. We determined whether radiographic measurements and clinical characteristics are different between patients with and without tibial component failure to identify mechanisms of failure and strategies to reduce the risk. METHODS: Out of 3,212 primary TKAs (2,725 TKAs with a two-year minimum follow up), of which all were performed with KA, eight patients presented with tibial component failure...
May 11, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28484791/varus-femoral-and-tibial-coronal-alignments-result-in-different-kinematics-and-kinetics-after-total-knee-arthroplasty
#3
Mutsumi Watanabe, Shinichi Kuriyama, Shinichiro Nakamura, Yoshihisa Tanaka, Kohei Nishitani, Moritoshi Furu, Hiromu Ito, Shuichi Matsuda
PURPOSE: Abnormal knee motion under various conditions has been described after total knee arthroplasty (TKA). However, differences in kinematics and kinetics of knees with varus femoral versus varus tibial alignment have not been evaluated. It was hypothesized that varus femoral and tibial alignments have the same impact on knee motion. METHODS: A musculoskeletal computer simulation was used. Femoral and tibial alignment in the coronal plane was each varied from neutral to 5° of varus in 1° increments...
May 8, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28477279/temporal-clustering-of-surgical-activities-in-robot-assisted-surgery
#4
Aneeq Zia, Chi Zhang, Xiaobin Xiong, Anthony M Jarc
PURPOSE: Most evaluations of surgical workflow or surgeon skill use simple, descriptive statistics (e.g., time) across whole procedures, thereby deemphasizing critical steps and potentially obscuring critical inefficiencies or skill deficiencies. In this work, we examine off-line, temporal clustering methods that chunk training procedures into clinically relevant surgical tasks or steps during robot-assisted surgery. METHODS: We collected system kinematics and events data from nine surgeons performing five different surgical tasks on a porcine model using the da Vinci Si surgical system...
May 5, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28460408/does-kinematic-alignment-improve-short-term-functional-outcomes-after-total-knee-arthroplasty-compared-with-mechanical-alignment-a-systematic-review-and-meta-analysis
#5
Yanhong Li, Shuanke Wang, Yuliang Wang, Mingxuan Yang
This meta-analysis was conducted to study whether kinematically aligned total knee arthroplasty (TKA) improves short-term functional outcomes compared with mechanical alignment without changing the hip-knee-ankle angle. Prospective cohort studies were searched from electronic literature databases, including PubMed, Web of Science, Embase (Ovid interface), and Cochrane Library (Ovid interface). Total 1,159 records were identified. Six trials involving 561 patients were eligible for data extraction and meta-analysis...
May 1, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28456677/kinematic-evaluation-of-cervical-sagittal-balance-and-thoracic-inlet-alignment-in-degenerative-cervical-spondylolisthesis-using-kmri
#6
Permsak Pahpolak, Alexander Nazareth, Patrick C Hsieh, Zorica Buser, Jeffrey C Wang
BACKGROUND CONTEXT: T1 slope is a novel thoracic parameter used to assess cervical spine sagittal balance. Thoracic Index (TI) parameters including T1 slope and cervical sagittal alignment parameters may play an important role in degenerative cervical spondylolisthesis (DCS). Current literature regarding the relationship between TI and cervical sagittal alignment parameters in patients with DCS is limited. PURPOSE: (1) To evaluate the T1 slope, cervical sagittal alignment, and Thoracic Inlet parameter in patients with DCS using kMRI, and (2) To find a correlation between the T1 slope, TI and other cervical sagittal parameters in DCS patients...
April 26, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28455730/knee-abduction-affects-greater-magnitude-of-change-in-acl-and-mcl-strains-than-matched-internal-tibial-rotation-in-vitro
#7
Nathaniel A Bates, Rebecca J Nesbitt, Jason T Shearn, Gregory D Myer, Timothy E Hewett
BACKGROUND: Anterior cruciate ligament (ACL) injures incur over USD 2 billion in annual medical costs and prevention has become a topic of interest in biomechanics. However, literature conflicts persist over how knee rotations contribute to ACL strain and ligament injury. To maximize the efficacy of ACL injury prevention, the effects of underlying mechanics need to be better understood. QUESTIONS/PURPOSES: We applied robotically controlled, in vivo-derived kinematic stimuli to the knee to assess ligament biomechanics in a cadaver model...
April 28, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28455473/radiological-and-clinical-comparison-of-kinematically-versus-mechanically-aligned-total-knee-arthroplasty
#8
T Matsumoto, K Takayama, K Ishida, S Hayashi, S Hashimoto, R Kuroda
AIMS: The aim of this study was to compare the post-operative radiographic and clinical outcomes between kinematically and mechanically aligned total knee arthroplasties (TKAs). PATIENTS AND METHODS: A total of 60 TKAs (30 kinematically and 30 mechanically aligned) were performed in 60 patients with varus osteoarthritis of the knee using a navigation system. The angles of orientation of the joint line in relation to the floor, the conventional and true mechanical axis (tMA) (the line from the centre of the hip to the lowest point of the calcaneus) were compared, one year post-operatively, on single-leg and double-leg standing long leg radiographs between the groups...
May 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28439637/tibiofemoral-rotational-alignment-affects-flexion-angles-in-navigated-posterior-stabilized-total-knee-arthroplasty
#9
Kazunari Ishida, Nao Shibanuma, Tomoyuki Matsumoto, Akihiko Toda, Shinya Oka, Kazuki Kodato, Koji Takayama, Masahiro Kurosaka, Ryosuke Kuroda
PURPOSE: To investigate the tibiofemoral rotational profiles during navigated posterior-stabilized (PS) total knee arthroplasty (TKA) and investigate the effect on post-operative maximum flexion angles. METHODS: Twenty-five subjects, treated with navigated PS TKA, were enrolled, and the effect of posterior cruciate ligament (PCL) resection and component implantation on tibiofemoral rotational kinematics was statistically evaluated. Then, the effect of rotational alignment changes on the post-operative maximum angles was retrospectively examined in 96 subjects using the multiple regression analysis...
April 24, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28439636/kinematic-alignment-is-a-possible-alternative-to-mechanical-alignment-in-total-knee-arthroplasty
#10
Yong Seuk Lee, Stephen M Howell, Ye-Yeon Won, O-Sung Lee, Seung Hoon Lee, Hamed Vahedi, Seow Hui Teo
PURPOSE: A systematic review was conducted to answer the following questions: (1) Does kinematically aligned (KA) total knee arthroplasty (TKA) achieve clinical outcomes comparable to those of mechanically aligned (MA) TKA? (2) How do the limb, knee, and component alignments differ between KA and MA TKA? (3) How is joint line orientation angle (JLOA) changed from the native knee in KA TKA compared to that in MA TKA? METHODS: Nine full-text articles in English that reported the clinical and radiological outcomes of KA TKA were included...
April 24, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28437676/superior-inferior-position-of-patellar-component-affects-patellofemoral-kinematics-and-contact-forces-in-computer-simulation
#11
Shinichiro Nakamura, Yoshihisa Tanaka, Shinichi Kuriyama, Kohei Nishitani, Hiromu Ito, Moritoshi Furu, Shuichi Matsuda
BACKGROUND: Anterior knee pain has been reported as a major postoperative complication after total knee arthroplasty, which may lead to patient dissatisfaction. Rotational alignment and the medial-lateral position correlate with patellar maltracking, which can cause knee pain postoperatively. However, the superior-inferior position of the patellar component has not been investigated. The purpose of the current study was to investigate the effects of the patellar superior-inferior position on patellofemoral kinematics and kinetics...
June 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28437130/lower-limb-and-trunk-biomechanics-after-fatigue-in-competitive-female-irish-dancers
#12
Catherine Y Wild, Avril Grealish, Diana Hopper
CONTEXT:   Because of the increasing popularity of participation in Irish dance, the incidence of lower limb injuries is high among this competitive population. OBJECTIVE:   To investigate the effects of fatigue on the peak lower limb and trunk angles as well as the peak lower limb joint forces and moments of competitive female Irish dancers during the performance of a dance-specific single-limb landing. DESIGN:   Cross-sectional study...
April 24, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28434698/influence-of-component-rotation-in-total-knee-arthroplasty-on-tibiofemoral-kinematics-a-cadaveric-investigation
#13
Guenther Maderbacher, Armin Keshmiri, Hans R Springorum, Hermann Maderbacher, Joachim Grifka, Clemens Baier
BACKGROUND: Physiological tibiofemoral kinematics have been shown to be important for good knee function after total knee arthroplasty (TKA). The purpose of the present study was to investigate the influence of component rotation on tibiofemoral kinematics during knee flexion. We asked which axial component alignment best reconstructs physiological tibiofemoral kinematics and which combinations should be avoided. METHODS: Ten healthy cadaveric knees were examined...
April 1, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28434534/comparative-analysis-of-trabecular-bone-structure-and-orientation-in-south-african-hominin-tali
#14
Anne Su, Kristian J Carlson
Tali of several hominin taxa are preserved in the fossil record and studies of the external morphology of these often show a mosaic of human-like and ape-like features. This has contributed to a growing recognition of variability characterizing locomotor kinematics of Australopithecus. In contrast, locomotor kinematics of another Plio-Pleistocene hominin, Paranthropus, are substantially less well-documented, in part, because of the paucity of postcranial fossils securely attributed to the genus. Since the talus transmits locomotor-based loads through the ankle and its internal structure is hypothesized to reflect accommodation to such loads, it is a cornerstone structure for reconstructing locomotor kinematics...
May 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28410594/physical-human-robot-interaction-of-an-active-pelvis-orthosis-toward-ergonomic-assessment-of-wearable-robots
#15
Nicolò d'Elia, Federica Vanetti, Marco Cempini, Guido Pasquini, Andrea Parri, Marco Rabuffetti, Maurizio Ferrarin, Raffaele Molino Lova, Nicola Vitiello
BACKGROUND: In human-centered robotics, exoskeletons are becoming relevant for addressing needs in the healthcare and industrial domains. Owing to their close interaction with the user, the safety and ergonomics of these systems are critical design features that require systematic evaluation methodologies. Proper transfer of mechanical power requires optimal tuning of the kinematic coupling between the robotic and anatomical joint rotation axes. We present the methods and results of an experimental evaluation of the physical interaction with an active pelvis orthosis (APO)...
April 14, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28407572/synthesis-and-viscoelastic-characterization-of-microstructurally-aligned-silk-fibroin-sponges
#16
Debojyoti Panda, Subhajit Konar, Saumendra K Bajpai, A Arockiarajan
Silk fibroin (SF) is a model candidate for use in tissue engineering and regenerative medicine owing to its bio-compatible mechanochemical properties. Despite numerous advances made in the fabrication of various biomimetic substrates using SF, relatively few clinical applications have been designed, primarily due to the lack of complete understanding of its constitutive properties. Here we fabricate microstructurally aligned SF sponge using the unidirectional freezing technique wherein a novel solvent-processing technique involving Acetic acid is employed, which obviates the post-treatment of the sponges to induce their water-stability...
March 28, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28384608/segmental-kinematic-analysis-of-planovalgus-feet-during-walking-in-children-with-cerebral-palsy
#17
Karen M Kruger, Katherine A Konop, Joseph J Krzak, Adam Graf, Haluk Altiok, Peter A Smith, Gerald F Harris
Pes planovalgus (flatfoot) is a common deformity among children with cerebral palsy. The Milwaukee Foot Model (MFM), a multi-segmental kinematic foot model, which uses radiography to align the underlying bony anatomy with reflective surface markers, was used to evaluate 20 pediatric participants (30feet) with planovalgus secondary to cerebral palsy prior to surgery. Three-dimensional kinematics of the tibia, hindfoot, forefoot, and hallux segments are reported and compared to an age-matched control set of typically-developing children...
March 23, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28373138/the-influence-of-spine-hip-relations-on-total-hip-replacement-a-systematic-review
#18
REVIEW
C Rivière, J-Y Lazennec, C Van Der Straeten, E Auvinet, J Cobb, S Muirhead-Allwood
Sagittal pelvic kinematics along with spino-pelvic angular parameters have recently been studied by numerous investigators for their effect on total hip replacement (THR) clinical outcomes, but many issue of spine-hip relations (SHR) are currently unexplored. Therefore, our review aims at clarifying the following questions: is there any evidence of a relationship between articular impingement/dislocation risk in primary THR and (1) certain sagittal pelvic kinematics patterns, (2) pelvic incidence, and (3) types of SHRs? A systematic review of the existing literature utilising PubMed and Google search engines was performed in January 2017...
April 1, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28371739/immediate-effects-of-shoes-inducing-ankle-destabilization-around-henke-s-axis-during-challenging-walking-gaits-gait-kinematics-and-peroneal-muscles-activities
#19
Lilian Fautrelle, Alexandre Kubicki, Nicolas Babault, Christos Paizis
Due to its high frequency of occurrence, as well as possible residual symptoms, proper treatment of lateral ankle sprains (LAS) is important. From a physiological point of view, increasing the quantity of electromyographic (EMG) activity in the peroneal muscles will mechanically improve the functional stability of the ankle joint. The present study investigated the immediate effects of an ankle destabilization device (ADD) specifically designed to induce imbalances along the Henke's axis during 3 challenging walking tasks...
March 23, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28364964/leaving-residual-varus-alignment-after-total-knee-arthroplasty-does-not-improve-patient-outcomes
#20
R Michael Meneghini, Tanner W Grant, Marshall K Ishmael, Mary Ziemba-Davis
BACKGROUND: Recent popularity of kinematic alignment and constitutional varus has caused some surgeons to leave varus limbs in residual varus after total knee arthroplasty (TKA). This study assessed whether if patients left in residual varus have improved outcomes compared with those fully corrected to neutral alignment. METHODS: A retrospective review of 361 consecutive primary TKAs was performed. Anatomic tibiofemoral alignment was measured and knees were categorized as neutral, varus, or valgus...
March 2, 2017: Journal of Arthroplasty
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