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https://www.readbyqxmd.com/read/28227967/a-stimulation-driven-exoskeleton-for-walking-after-paraplegia
#1
Sarah R Chang, Mark J Nandor, Lu Li, Kevin M Foglyano, John R Schnellenberger, Rudi Kobetic, Roger D Quinn, Ronald J Triolo, Sarah R Chang, Mark J Nandor, Lu Li, Kevin M Foglyano, John R Schnellenberger, Rudi Kobetic, Roger D Quinn, Ronald J Triolo, Mark J Nandor, Rudi Kobetic, Roger D Quinn, John R Schnellenberger, Sarah R Chang, Kevin M Foglyano, Lu Li, Ronald J Triolo
An untethered version of a stimulation-driven exoskeleton was evaluated for its ability to restore walking after paralysis from spinal cord injury. The hybrid neuroprosthesis (HNP) combined a passive variable-constraint exoskeleton for stability and support with functional neuromuscular stimulation (FNS) to contract the paralyzed muscles to drive limb movement. This self-contained HNP was operated by an onboard controller that sampled sensor signals, generated appropriate commands to both the exoskeletal constraints and integrated stimulator, and transmitted data wirelessly via Bluetooth to an off-board computer for real-time monitoring and recording for offline analysis...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227942/unified-phase-variables-of-relative-degree-two-for-human-locomotion
#2
Dario J Villarreal, Robert D Gregg, Dario J Villarreal, Robert D Gregg, Robert D Gregg, Dario J Villarreal
A starting point to achieve stable locomotion is synchronizing the leg joint kinematics during the gait cycle. Some biped robots parameterize a nonlinear controller (e.g., input-output feedback linearization) whose main objective is to track specific kinematic trajectories as a function of a single mechanical variable (i.e., a phase variable) in order to allow the robot to walk. A phase variable capable of parameterizing the entire gait cycle, the hip phase angle, has been used to control wearable robots and was recently shown to provide a robust representation of the phase of human gait...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227914/automated-classification-of-pathological-gait-after-stroke-using-ubiquitous-sensing-technology
#3
Elham Dolatabadi, Babak Taati, Alex Mihailidis, Elham Dolatabadi, Babak Taati, Alex Mihailidis, Babak Taati, Alex Mihailidis, Elham Dolatabadi
This study uses machine learning methods to distinguish between healthy and pathological gait. Examples of multi-dimensional pathological and normal gait sequences were collected from post-stroke and healthy individuals in a real clinical setting and with two Kinect sensors. The trajectories of rotational angle and global velocity of selected body joints (hips, spine, shoulders, neck, knees and ankles) over time formed the gait sequences. The combination of k nearest neighbor (kNN) and dynamic time warping (DTW) was used for classification...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227887/hip-joint-geometry-effects-on-cartilage-contact-stresses-during-a-gait-cycle
#4
Hui-Hui Wu, Dong Wang, An-Bang Ma, Dong-Yun Gu, Hui-Hui Wu, Dong Wang, An-Bang Ma, Dong-Yun Gu, An-Bang Ma, Dong-Yun Gu, Hui-Hui Wu, Dong Wang
The cartilage surface geometry of natural human hip joint is commonly regarded as sphere. It has been widely applied in computational simulation and hip joint prosthesis design. Some new geometry models have been developed and the sphere assumption has been questioned recently. The objective of this study was to analyze joint geometry effects on cartilage contact stress distribution and investigate contact patterns during a whole gait cycle. Hip surface was reconstructed from CT data of a healthy volunteer...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227883/development-and-validation-of-thums-version-5-with-1d-muscle-models-for-active-and-passive-automotive-safety-research
#5
Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto, Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto, Hideyuki Kimpara, Masami Iwamoto, Yuko Nakahira
Accurately predicting the occupant kinematics is critical to better understand the injury mechanisms during an automotive crash event. The objectives of this study were to develop and validate a finite element (FE) model of the human body integrated with an active muscle model called Total HUman Model for Safety (THUMS) version 5, which has the body size of the 50th percentile American adult male (AM50). This model is characterized by being able to generate a force owing to muscle tone and to predict the occupant response during an automotive crash event...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227658/evaluating-the-deflection-of-dexterous-continuum-manipulators-with-unevenly-distributed-compliant-joints
#6
Anzhu Gao, Ryan J Murphy, Hao Liu, Iulian Iordachita, Mehran Armand, Anzhu Gao, Ryan J Murphy, Hao Liu, Iulian Iordachita, Mehran Armand, Hao Liu, Anzhu Gao, Iulian Iordachita, Mehran Armand, Ryan J Murphy
Dexterous continuum manipulators (DCMs) offer great potential for increasing instrument reach in minimally-invasive surgical procedures. We previously designed and fabricated a tendon driven DCM with a large instrument channel and evenly distributed compliant joints for minimally-invasive skull base surgery and the treatment of osteolysis during hip revision surgery. The evenly distributed compliant joints, in some cases, may limit the reach of the DCM during lesion removal. In this paper, we propose a finite element analysis (FEA) method for optimizing the distribution of the compliant joints based on treatment space requirements determined preoperatively...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227646/a-wearable-robotic-orthosis-with-a-spring-assist-actuator
#7
Seungmin Jung, Chankyu Kim, Jisu Park, Dongyoub Yu, Jaehwan Park, Junho Choi, Seungmin Jung, Chankyu Kim, Jisu Park, Dongyoub Yu, Jaehwan Park, Junho Choi, Dongyoub Yu, Jaehwan Park, Junho Choi, Seungmin Jung, Chankyu Kim, Jisu Park
This paper introduces a wearable robotic orthosis with spring-assist actuators, which is designed to assist people who have difficulty in walking. The spring-assist actuator consists of an electrical motor and a spring, which are attached to a rotational axis in parallel to each other. The spring-assist actuator is developed based on the analysis on the stiffness of the knee and hip joints during walking. "COWALK-Mobile," which is a wearable robotic orthosis, is developed using the spring-assist actuators to reduce the required motor torque during walking...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227641/optimization-of-an-unpowered-energy-stored-exoskeleton-for-patients-with-spinal-cord-injury
#8
Xinyu Guan, Linhong Ji, Rencheng Wang, Wenjie Huang, Xinyu Guan, Linhong Ji, Rencheng Wang, Wenjie Huang, Rencheng Wang, Xinyu Guan, Wenjie Huang, Linhong Ji
The paper describes a novel unpowered energy-stored exoskeleton (ES-EXO) for spinal cord injured patients in consideration of patients' characteristics and injured levels. It proposed a method to optimize the energy-stored element to decrease the hip joint moment in walking. EMG patterns, ground reaction force and motion data from one participant with complete spinal cord injury at T10 were recorded. A combined human-ES-EXO model was built and the stored-energy element including locations and stiffness of springs were optimized in AnyBody Modeling System...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227638/simulation-of-fluid-environment-using-a-robotic-orthosis-on-human-lower-extremity-for-therapeutic-purposes
#9
Tayfun Efe Ertop, Tolga Yuksel, Erhan Ilhan Konukseven, Tayfun Efe Ertop, Tolga Yuksel, Erhan Ilhan Konukseven, Tolga Yuksel, Erhan Ilhan Konukseven, Tayfun Efe Ertop
Rehabilitation under water is a viable physical rehabilitation option, but it has some limitations in terms of adapting to needs of each patient. In addition, its facility requirements are relatively high. Simulating the fluid environment using a robotic system would enable therapists adjust various parameters so that the therapy is tailored to the patient's unique state. Also, using a robotic system instead might be less costly and easily reachable. In this study, human lower extremity movement in fluids is modeled...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226430/postural-flexibility-during-quiet-standing-in-healthy-elderly-and-patients-with-parkinson-s-disease
#10
Kazuyuki Matsuda, Yasuyuki Suzuki, Naoya Yoshikawa, Tomohisa Yamamoto, Ken Kiyono, Takao Tanahashi, Takuyuki Endo, Kei Fukada, Kunihiko Nomura, Saburo Sakoda, Taishin Nomura, Kazuyuki Matsuda, Yasuyuki Suzuki, Naoya Yoshikawa, Tomohisa Yamamoto, Ken Kiyono, Takao Tanahashi, Takuyuki Endo, Kei Fukada, Kunihiko Nomura, Saburo Sakoda, Taishin Nomura, Kei Fukada, Naoya Yoshikawa, Tomohisa Yamamoto, Takuyuki Endo, Kunihiko Nomura, Taishin Nomura, Kazuyuki Matsuda, Ken Kiyono, Takao Tanahashi, Saburo Sakoda, Yasuyuki Suzuki
Postural instability is one of the predominant symptoms of Parkinson's disease (PD). Despite its significant impact on the deterioration in quality of life in PD patients, mechanistic causes of the instability have not been clarified. Joint inflexibility at ankle and hip joints might be such a major cause, leading to small variability in the center of pressure (CoP) during quiet stance. However, this conjecture is still controversial. Thus, quantitative characterization of CoP patterns during quiet stance in PD patients remains a matter of research...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28223094/a-decade-of-the-catalonian-arthroplasty-register-racat-variability-exhaustivity-and-survival-of-prostheses-between-2005-and-2014
#11
J Arias-de la Torre, A Capdevila, O Martínez, L Domingo, M Marinelli, N Robles, J Nardi, L Puig-Verdié, F Pallisó, M Espallargues
BACKGROUND AND AIM: The Catalonian Arthroplasty Register (RACat) is a public health-based population register used to analyse and evaluate hip and knee replacements in Catalonia. The aim of this study is to present the outcomes after 10 years in operation (January 2005-December 2014). METHODOLOGY: Using the information from the RACat and the minimum basic data set at hospital discharge, an analysis was made of the quality and exhaustivity of the data, as well as a descriptive analysis of the patients, prostheses, and care process...
February 17, 2017: Revista Española de Cirugía Ortopédica y Traumatología
https://www.readbyqxmd.com/read/28220396/evaluation-of-the-turning-characteristics-according-to-the-severity-of-parkinson-disease-during-the-timed-up-and-go-test
#12
Minji Son, Changhong Youm, Sangmyung Cheon, Jaewoo Kim, Meounggon Lee, Youkyung Kim, Jinhee Kim, Hyeryun Sung
BACKGROUND: Patients with Parkinson disease (PD) experience problems such as falls and freezing of gait during walking and turning in daily activities. However, few studies have examined the relationship between simultaneous turning tasks and the severity of PD. AIM: To investigate turning characteristics in patients with PD using three-dimensional (3D) analysis during the timed up and go (TUG) test. METHODS: Thirty individuals performed the TUG test under 3D motion analysis: 10 patients with Hoehn and Yahr (H&Y) stages 2...
February 20, 2017: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/28219656/ultrasound-abnormalities-in-septic-arthritis-are-associated-with-functional-outcomes
#13
Emeline Gaigneux, Grégoire Cormier, Stéphane Varin, Oriane Mérot, Yves Maugars, Benoit Le Goff
OBJECTIVES: To describe the ultrasound abnormalities seen in septic arthritis and to assess their associations with clinical, biological, and radiological outcomes METHODS: We prospectively included 34 patients with septic arthritis of a native joint (knee, n=19; shoulder, n=6; hip, n=4; ankle, n=3; or wrist, n=2). Ultrasonography was performed to record synovial-membrane thickness and vascularity, joint effusion, and abnormalities of adjacent soft tissues, at baseline then 4 days, 2 weeks, and 3 months later...
February 17, 2017: Joint, Bone, Spine: Revue du Rhumatisme
https://www.readbyqxmd.com/read/28219416/the-safe-screw-path-along-inferior-border-of-the-arcuate-line-at-acetabular-area-an-anatomical-study-based-on-ct-scans
#14
Chun Bi, Jiandong Wang, Xiaoxi Ji, Zhijian Ma, Fang Wang, Xiangsen Zeng, Dongmei Wang, Qiugen Wang
BACKGROUND: Misplaced screw during the internal fixation of acetabular fractures may penetrate the hip joint which might cause chondrolysis and traumatic osteoarthritis in the future. This study aims to acquire the safe path for screw insertion along inferior border of the arcuate line fixation route at acetabular area. METHODS: Computed tomography (CT) scans of 98 patients without pelvic trauma were rebuilt for three-dimensional models of pelvis. After depicting the fixation route curve, five cross-sections perpendicularly to the curve were established from the anterior of pelvis to the posterior along inferior border of the arcuate line...
February 20, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28214460/managing-acetabular-defects-in-total-hip-arthroplasty
#15
Brian Park, Frank Liporace, Scott Marwin
With the aging population and rising incidence of primary total joint arthroplasty has come the increasing incidence of revision total hip arthroplasties. One challenge in revision total hip arthroplasty is dealing with acetabular defects. The orthopaedic surgeon who chooses to take on these challenges requires a proper method for the evaluation of these defects as well as an evidence-based treatment algorithm. Initial assessment requires appropriate use and interpretation of imaging modalities such as x-rays and computed tomography...
January 2017: Bulletin of the Hospital for Joint Diseases
https://www.readbyqxmd.com/read/28214257/a-comparison-of-two-dosing-regimens-of-asa-following-total-hip-and-knee-arthroplasties
#16
Michael J Feldstein, Sara L Low, Antonia F Chen, Laura A Woodward, William J Hozack
BACKGROUND: The purpose of this study was to compare short-term side effects of aspirin (ASA) 325 mg vs ASA 81 mg orally twice daily (PO BID) when used as thromboembolic prophylaxis following primary total joint arthroplasty. METHODS: A 1-year prospective cohort study was performed on 643 primary unilateral total joint arthroplasty patients operated on by a single surgeon. Two hundred eighty-two patients were administered ASA 325 mg PO BID and 361 patients were administered ASA 81 mg PO BID for 1 month...
January 24, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28214256/is-there-a-threshold-value-of-hemoglobin-a1c-that-predicts-risk-of-infection-following-primary-total-hip-arthroplasty
#17
Jourdan M Cancienne, Brian C Werner, James A Browne
BACKGROUND: There remains little evidence to support a perioperative hemoglobin A1c (HbA1c) level that could serve as a threshold for a significantly increased risk of deep postoperative infection in patients with diabetes mellitus (DM) following total hip arthroplasty (THA). METHODS: A national administrative database was queried for patients who underwent primary THA with DM. Patients with an HbA1c level within 3 months of surgery were identified and were stratified based on HbA1c level in 0...
January 24, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28210985/lumbar-disc-degeneration-was-not-related-to-spine-and-hip-bone-mineral-densities-in-chinese-facet-joint-osteoarthritis-may-confound-the-association
#18
Jianjiang Pan, Xuan Lu, Ge Yang, Yongmei Han, Xiang Tong, Yue Wang
: A sample of 512 Chinese was studied and we observed that greater disc degeneration on MRI was associated with greater spine DXA BMD. Yet, this association may be confounded by facet joint osteoarthritis. BMD may not be a risk factor for lumbar disc degeneration in Chinese. PURPOSE: Evidence suggested that lumbar vertebral bone and intervertebral disc interact with each other in multiple ways. The current paper aims to determine the association between bone mineral density (BMD) and lumbar disc degeneration using a sample of Chinese...
December 2017: Archives of Osteoporosis
https://www.readbyqxmd.com/read/28210944/postoperative-imaging-in-arthroscopic-hip-surgery
#19
REVIEW
F Di Pietto, V Chianca, R de Ritis, E Cesarano, A Reginelli, A Barile, M Zappia, L Ginolfi
Arthroscopic surgery of the hip, compared to that of the knee or the shoulder, has only recently been developed in any significant way. Current indications for arthroscopic surgery of the hip include: diagnosis and treatment of lesions symptomatic of the acetabular labrum, femoroacetabular impingement (FAI), chondral lesions, joint infections, lesions of the teres ligament, impingement of the psoas tendon, pathology of the peritrochanteric space, external snapping hip (coxa saltans), and traumatic and atraumatic instability...
February 16, 2017: Musculoskeletal Surgery
https://www.readbyqxmd.com/read/28210036/a-study-on-muscle-activity-and-ratio-of-the-knee-extensor-depending-on-the-types-of-squat-exercise
#20
Jeong-Il Kang, Joon-Su Park, Hyun Choi, Dae-Keun Jeong, Hye-Min Kwon, Young-Jun Moon
[Purpose] For preventing the patellofemoral pain syndrome, this study aims to suggest a proper squat method, which presents selective muscle activity of Vastus Medialis Oblique and muscle activity ratios of Vastus Medialis Oblique/Vastus Lateralis by applying squat that is a representative weight bearing exercise method in various ways depending on the surface conditions and knee bending angles. [Subjects and Methods] An isometric squat that was accompanied by hip adduction, depending on the surface condition and the knee joint flexion angle, was performed by 24 healthy students...
January 2017: Journal of Physical Therapy Science
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