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https://www.readbyqxmd.com/read/28822943/sound-side-joint-contact-forces-in-below-knee-amputee-gait-with-an-esar-prosthetic-foot
#1
Mohammad Taghi Karimi, Firooz Salami, Amir Esrafilian, Daniel W W Heitzmann, Merkur Alimusaj, Cornelia Putz, Sebastian I Wolf
The incidence of knee and hip joint osteoarthritis in subjects with below knee amputation (BK) appears significantly higher compared to unimpaired subjects, especially in the intact side. However, it is controversial if constant higher loads on the sound side are one of the major factors for an increased osteoarthritis (OA) incidence in subjects with BK, beside other risk factors, e.g. with respect to metabolism. The aim wasto investigate joint contact forces (JCF) calculated by a musculoskeletal model in the intact side and to compare it with those of unimpaired subjects and to further elucidate in how far increased knee JCF are associated with increased frontal plane knee moments...
August 8, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28822791/acute-unilateral-hip-pain-in-fibrodysplasia-ossificans-progressiva-fop
#2
Frederick S Kaplan, Mona Al Mukaddam, Robert J Pignolo
BACKGROUND: Flare-ups of the hips are among the most feared and disabling complications of fibrodysplasia ossificans progressiva (FOP) and are poorly understood. In order to better understand the nature of hip flare-ups in FOP, we evaluated 25 consecutive individuals with classic FOP (14 males, 11 females; 3-56years old, median age, 17years old) who presented with acute unilateral hip pain. RESULTS: All 25 individuals were suspected of having a flare-up of the hip based on clinical history and a favorable response to a four day course of high-dose oral prednisone...
August 16, 2017: Bone
https://www.readbyqxmd.com/read/28821515/does-the-person-s-context-influence-engagement-in-life-activities-following-primary-knee-replacement-results-from-a-canadian-prospective-cohort-study
#3
Aileen M Davis, Viji Venkataramanan, Jessica Bytautas-Sillanpää, Anthony V Perruccio, Rosalind Wong, Lisa Carlesso, Fiona Webster
OBJECTIVE: The impact of the context of a person's life on recovery from surgical interventions is not well understood. This study evaluated if people's social, environmental and biomedical context was associated with change in frequency in engagement in life activities after total knee replacement (TKR). METHODS: 418 people aged 30+ years who had TKR were followed presurgery to 1 year postsurgery. The outcome was change in frequency in engagement in life activities measured by the Late Life Disability Index (LLDI)...
August 18, 2017: BMJ Open
https://www.readbyqxmd.com/read/28821464/multi-elemental-nanoparticle-exposure-after-tantalum-component-failure-in-hip-arthroplasty-in-depth-analysis-of-a-single-case
#4
Janosch Schoon, Sven Geißler, Juliane Traeger, Andreas Luch, Jutta Tentschert, Giorgio Perino, Frank Schulze, Georg N Duda, Carsten Perka, Anastasia Rakow
Porous tantalum components are widely used for complex acetabular reconstructions in revision hip arthroplasty. Multiple other metal alloys such as titanium-aluminum-vanadium or cobalt-chromium-molybdenum are principally used in artificial joint setups. We report a case of tantalum component failure being both cause and effect of a multiple metal exposure. Our aims were to assess and to characterize associated particle exposure and biological consequences. Metal level quantification revealed substantial in vivo exposure to particulate and dissociated tantalum, zirconium, chromium, cobalt, molybdenum, titanium, aluminum and vanadium in periprosthetic compartments...
August 16, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28820446/towards-scalable-strain-gauge-based-joint-torque-sensors
#5
Hamza Khan, Mariapaola D'Imperio, Ferdinando Cannella, Darwin G Caldwell, Alfred Cuschieri, Claudio Semini
During recent decades, strain gauge-based joint torque sensors have been commonly used to provide high-fidelity torque measurements in robotics. Although measurement of joint torque/force is often required in engineering research and development, the gluing and wiring of strain gauges used as torque sensors pose difficulties during integration within the restricted space available in small joints. The problem is compounded by the need for a scalable geometric design to measure joint torque. In this communication, we describe a novel design of a strain gauge-based mono-axial torque sensor referred to as square-cut torque sensor (SCTS), the significant features of which are high degree of linearity, symmetry, and high scalability in terms of both size and measuring range...
August 18, 2017: Sensors
https://www.readbyqxmd.com/read/28820271/cam-deformities-and-limited-hip-range-of-motion-are-associated-with-early-osteoarthritic-changes-in-adolescent-athletes-a-prospective-matched-cohort-study
#6
Cody C Wyles, Germán A Norambuena, Benjamin M Howe, Dirk R Larson, Bruce A Levy, Brandon J Yuan, Robert T Trousdale, Rafael J Sierra
BACKGROUND: The natural history of femoroacetabular impingement (FAI) remains incompletely understood. In particular, there is limited documentation of joint damage in adolescent patients with limited range of motion (LROM) of the hip, which is commonly associated with FAI. PURPOSE: To evaluate changes in magnetic resonance imaging (MRI), radiographs, and clinical examinations over 5 years in a group of athletes from a wide variety of sports with asymptomatic LROM of the hip compared with matched controls...
August 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28819826/the-outcome-of-the-partial-resurfacing-arthroplasty-of-the-hip-shows-high-numbers-of-failures-and-conversion-to-total-arthroplasty
#7
Thilo Floerkemeier, Stefan Budde, Nils Wirries, Gabriela von Lewinski, Henning Windhagen, Marco Ezechieli
PURPOSE: Local cartilage and bony defects, which are too large for joint preserving cartilage treatment are difficult to treat. The implantation of a mini-resurfacing implant (Hemicap®, 2med, Hamburg, Germany) may be a possible alternative treatment for these patients. This partial replacement fills the defect and restores a smooth and continuous articular surface. The aim of this study was to determine short- to midterm results of the treatment of local cartilage defects of the femoral head using the Hemicap®...
August 17, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28819605/recurrent-extra-and-intra-articular-synovial-chondromatosis-of-the-ankle-with-tarsal-tunnel-syndrome-a-rare-case-report
#8
Jonathan A Isbell, Andrew C Morris, Ibukunoluwa Araoye, Sameer Naranje, Ashish B Shah
INTRODUCTION: Synovial chondromatosis is a rare, benign monoarticular condition characterized by the metaplastic formation of cartilaginous nodules from the synovium of joints (intra-articular), tendons and bursae (extra-articular). These nodules have the potential to detach and form loose bodies within the joint space. The most common locations are the large joints such as the knees, hips, elbows, and shoulders, with less common locations being the foot and ankle joints. Synovial chondromatosis primarily occurs in men between the third and fifth decades of life, and it typically presents as chronic joint pain with swelling, decreased joint range of motion, and osteoarthritis...
March 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28819592/insufficiency-fractures-of-the-distal-tibia-and-fibula-following-total-hip-arthroplasty-a-case-report
#9
Ryu Kojima, Toshiki Miura, Eisei Fukatani
INTRODUCTION: Although periprosthetic fractures of the femur have been well documented, insufficiency fractures following total hip arthroplasty (THA) have been rarely described. We report a case of an insufficiency fracture in the distal tibia and fibula that occurred after THA. CASE REPORT: A 54-year-old woman presented with severe pain in the bilateral hip joints and was diagnosed with end-stage osteoarthritis. She underwent THA on the right side. Although the postoperative course was uneventful, she suddenly experienced severe pain and swelling in the right leg without any history of trauma 22 weeks after the surgery...
March 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28819341/reliability-of-the-acetabular-reconstruction-technique-using-autogenous-bone-graft-from-resected-femoral-head-in-hip-dysplasia-influence-of-the-change-of-hip-joint-center-on-clinical-outcome
#10
Joo Ho Song, Tae Soo Ahn, Pil Whan Yoon, Jae Suk Chang
INTRODUCTION: The previous studies have not reached on consensus as to the outcome of acetabular reconstruction with autogenous bone graft for dysplastic hips, especially in severe cases such as Crowe type IV. The current study aimed to determine the survivorship of the arthroplasty and the grafts as well as the change of hip joint center averagely 9.8 years (range, 5-19) after cementless total hip arthroplasty. MATERIALS AND METHODS: We reviewed 52 cases including 19 cases of complete hip dislocation of which acetabular defects were augmented with autogenous bone grafts taken from the resected femoral heads...
December 2017: Journal of Orthopaedics
https://www.readbyqxmd.com/read/28817701/effect-of-exoskeletal-joint-constraint-and-passive-resistance-on-metabolic-energy-expenditure-implications-for-walking-in-paraplegia
#11
Sarah R Chang, Rudi Kobetic, Ronald J Triolo
An important consideration in the design of a practical system to restore walking in individuals with spinal cord injury is to minimize metabolic energy demand on the user. In this study, the effects of exoskeletal constraints on metabolic energy expenditure were evaluated in able-bodied volunteers to gain insight into the demands of walking with a hybrid neuroprosthesis after paralysis. The exoskeleton had a hydraulic mechanism to reciprocally couple hip flexion and extension, unlocked hydraulic stance controlled knee mechanisms, and ankles fixed at neutral by ankle-foot orthoses...
2017: PloS One
https://www.readbyqxmd.com/read/28816897/surgical-correction-of-cam-deformity-in-association-with-femoroacetabular-impingement-and-its-impact-on-the-degenerative-process-within-the-hip-joint
#12
Paul E Beaulé, Andrew D Speirs, Helen Anwander, Gerd Melkus, Kawan Rakhra, Hanspeter Frei, Mario Lamontagne
BACKGROUND: Cam morphology in association with femoroacetabular impingement (FAI) is a recognized cause of hip pain and cartilage damage and proposed as a leading cause of arthritis. The purpose of this study was to analyze the functional and biomechanical effects of the surgical correction of the cam deformity on the degenerative process associated with FAI. METHODS: Ten male patients with a mean age of 34.3 years (range, 23.1 to 46.5 years) and a mean body mass index (and standard deviation) of 26...
August 16, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28815387/image-guided-surgical-robotic-system-for-percutaneous-reduction-of-joint-fractures
#13
Giulio Dagnino, Ioannis Georgilas, Samir Morad, Peter Gibbons, Payam Tarassoli, Roger Atkins, Sanja Dogramadzi
Complex joint fractures often require an open surgical procedure, which is associated with extensive soft tissue damages and longer hospitalization and rehabilitation time. Percutaneous techniques can potentially mitigate these risks but their application to joint fractures is limited by the current sub-optimal 2D intra-operative imaging (fluoroscopy) and by the high forces involved in the fragment manipulation (due to the presence of soft tissue, e.g., muscles) which might result in fracture malreduction. Integration of robotic assistance and 3D image guidance can potentially overcome these issues...
August 16, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28814031/evaluation-of-walking-smoothness-using-wearable-robotic-system-curara%C3%A2-for-spinocerebellar-degeneration-patients
#14
Atsushi Tsukahara, Kunihiro Yoshida, Akira Matsushima, Kumiko Ajima, Chika Kuroda, Noriaki Mizukami, Minoru Hashimoto
This paper aimed to verify the effectiveness of the wearable robotic system "curara" for patients with spinocerebellar degeneration (SCD) by evaluating walking smoothness. The curara system supports the wearer's gait using a synchronization control method that uses a neural oscillator based on a central pattern generator network. The system reflects the motional intention by adjusting the synchronization gains. This modifies the degree of interactive coordinated motion between the curara and the wearer. As a feasibility study, we evaluated the waking smoothness of 10 patients with SCD using three gain condition settings...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814008/self-aligning-exoskeleton-hip-joint-kinematic-design-with-five-revolute-three-prismatic-and-one-ball-joint
#15
Jonas Beil, Charlotte Marquardt, Tamim Asfour
Kinematic compatibility is of paramount importance in wearable robotic and exoskeleton design. Misalignments between exoskeletons and anatomical joints of the human body result in interaction forces which make wearing the exoskeleton uncomfortable and even dangerous for the human. In this paper we present a kinematically compatible design of an exoskeleton hip to reduce kinematic incompatibilities, so called macro- and micro-misalignments, between the human's and exoskeleton's joint axes, which are caused by inter-subject variability and articulation...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813869/effects-of-assistance-timing-on-metabolic-cost-assistance-power-and-gait-parameters-for-a-hip-type-exoskeleton
#16
Jusuk Lee, Keehong Seo, Bokman Lim, Junwon Jang, Kyungrock Kim, Hyundo Choi
There are many important factors in developing an exoskeleton for assisting human locomotion. For example, the weight should be sufficiently light, the assist torque should be high enough to assist joint motion, and the assistance timing should be just right. Understanding how these design parameters affect overall performance of a complex human-machine system is critical for the development of these types of systems. The present study introduces an assistance timing controller that regulates assistance timing such that peak joint velocity and peak assistance power are offset by a reference value for our hip-type exoskeleton...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813865/template-model-inspired-leg-force-feedback-based-control-can-assist-human-walking
#17
Guoping Zhao, Maziar Sharbafi, Mark Vlutters, Edwin van Asseldonk, Andre Seyfarth
We present a novel control approach for assistive lower-extremity exoskeletons. In particular, we implement a virtual pivot point (VPP) template model inspired leg force feedback based controller on a lower-extremity powered exoskeleton (LOPES II) and demonstrate that it can effectively assist humans during walking. It has been shown that the VPP template model is capable of stabilizing the trunk and reproduce a human-like hip torque during the stance phase of walking. With leg force and joint angle feedback inspired by the VPP template model, our controller provides hip and knee torque assistance during the stance phase...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813864/gait-assessment-system-based-on-novel-gait-variability-measures
#18
Xingchen Wang, Danijela Ristic-Durrant, Matthias Spranger, Axel Graser
In this paper, a novel gait assessment system based on measures of gait variability reflected through the variability of shapes of gait cycles trajectories is proposed. The presented gait assessment system is based on SVM (support vector machine) classifier and on gait variability-based features calculated from the hip and knee joint angle trajectories recorded using wearable IMUs during walking trials. A system classifier was trained to distinguish healthy gait patterns from the pathological ones. The features were extracted by calculating the distances between the joint trajectories of the individual gait cycles using 4 different distance functions...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813861/exoskeleton-for-gait-rehabilitation-of-children-conceptual-design
#19
Jorge L Cornejo, Jesus F Santana, Sergio A Salinas
This paper presents the conceptual design of an exoskeleton for gait rehabilitation of children. This system has electronics, mechanicals and software sections, which are implemented and tested using a mannequin of a child. The prototype uses servomotors to move robotic joints that are attached to simulated patient's legs. The design has 4 DOF (degrees of freedom) two for hip joints and other two for knee joints, in the sagittal plane. A microcontroller measures sensor signals, controls motors and exchanges data with a computer...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813859/an-assistive-lower-limb-exoskeleton-for-people-with-neurological-gait-disorders
#20
A Ortlieb, M Bouri, R Baud, H Bleuler
Lower limb exoskeletons have already proven the capability to give back mobility to people suffering from spinal cord injury (SCI). Other important populations such as people with multiple sclerosis or muscular dystrophy, frail elderly and stroke victims, suffer from severe gait impairments and could benefit from similar technology. The work presented in the current paper describes a novel design of a 6-actuated degrees of freedom (DOFs) assistive lower limb exoskeleton for people with moderate mobility impairments...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
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