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https://read.qxmd.com/read/30857935/repeatability-and-accuracy-of-a-foot-muscle-strength-dynamometer
#1
Alessandro Garofolini, Simon Taylor, Patrick McLaughlin, Robert Stokes, Michael Kusel, Karen J Mickle
Toe flexor strength is a pivotal biomechanical contributor for effecting balance and gait. However, there are limited reports that evaluate measurement accuracy and repeatability of this important attribute. Dynamometers are designed to measure force which can be used to derive joint torque if the perpendicular distance to the joint axis is known. However, an accurate and reliable measurement method to assess the ability of the toe flexor muscles to produce torque, is lacking. Here we describe a new device and method, designed to quantify the toe flexor torque developed at the metatarsal phalangeal joint...
March 9, 2019: Medical Engineering & Physics
https://read.qxmd.com/read/30851623/effects-of-a-lower-extremity-exercise-program-on-gait-biomechanics-and-clinical-outcomes-in-children-and-adolescents-with-obesity-a-randomized-controlled-trial
#2
B Horsak, C Schwab, A Baca, S Greber-Platzer, A Kreissl, S Nehrer, M Keilani, R Crevenna, A Kranzl, B Wondrasch
BACKGROUND: Research highlights the detrimental effects of obesity on gait biomechanics and the accompanied risk of lower-extremity skeletal malalignments, increased joint stress, pain and discomfort. Individuals with obesity typically show increased knee valgus angles combined with an increased step width. Accompanying muscular dysfunctions impede their ability to compensate for these alterations, especially in the frontal plane. To date, no studies are available, which evaluated the potential effects of an exercise program (EP) in reducing these unfavorable biomechanical changes...
February 27, 2019: Gait & Posture
https://read.qxmd.com/read/30846325/novel-multi-axial-alveolar-distractor-part-i-design-manufacture-and-mechanical-functional-tests
#3
Yang-Sung Lin, Cheng-Hsien Wu, Yuan-Chih Liu, Chun-Li Lin
PURPOSE: This study developed a novel multi-axial alveolar distractor and evaluated its safety and effectiveness by performing various mechanical tests and finite element (FE) analysis. MATERIALS AND METHODS: A ball-and-socket joint with a high degree of freedom was proposed as the design concept to make the distractor produce a cone trajectory motion range of up to 60° with respect to the transport screw (central axis). This device was manufactured with Ti6Al4V alloy...
February 20, 2019: Journal of Cranio-maxillo-facial Surgery
https://read.qxmd.com/read/30843468/prediction-of-thigh-calf-contact-parameters-from-anthropometric-regression
#4
David C Kingston, Stacey M Acker
High knee flexion postures are common in industry and cultural practices, but the mechanical effect of intersegmental force, particularly thigh-calf contact force, on knee joint compressive force is poorly understood. Although some studies have measured thigh-calf contact parameters occurring in a number of high flexion postures, joint contact modeling would benefit from efforts to predict thigh-calf contact force for use in computational models. Therefore, this study assessed the strength of correlations and linear multiple regression models on the following five high flexion thigh-calf contact parameters in a young, healthy population: the onset angle of thigh-calf contact, maximum flexion angle, total thigh-calf contact force, center of force, and contact area at maximum flexion...
March 7, 2019: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://read.qxmd.com/read/30839175/sex-comparisons-of-agonist-and-antagonist-muscle-electromyographic-parameters-during-two-different-submaximal-isometric-fatiguing-tasks
#5
Sunggun Jeon, Xin Ye, William M Miller
To examine the task failure time of the force- and position-based submaximal elbow flexion fatiguing tasks for both sexes, twelve men and eight women visited the laboratory for two separate experimental occasions. During the experiment, they pulled against a rigid restraint for the force task and maintained a constant elbow joint angle to support an equivalent inertial load for the position task. For both fatiguing tasks (50% of the isometric strength at the elbow joint angle of 135 degree), the task failure time, along with the surface electromyographic (EMG) amplitude and mean frequency (MNF) were measured...
March 2019: Physiological Reports
https://read.qxmd.com/read/30838149/spontaneous-osteonecrosis-of-the-tarsal-navicular-a-report-of-two-cases
#6
Yukie Kitaura, Akinobu Nishimura, Shigeto Nakazora, Aki Fukuda, Yoshiyuki Senga, Ko Kato, Akihiro Sudo
Spontaneous osteonecrosis of the tarsal navicular, called the Mueller-Weiss syndrome, is an uncommon disease. Patients who are resistant to conservative treatment require operative treatment. However, there is no established operative treatment. Two cases of spontaneous osteonecrosis of the tarsal navicular with double (talonavicular and naviculocuneiform joints) arthrodeses with different locking plates are presented. Removal of necrotic areas from the tarsal navicular and replacement with autologous bone graft procured from the iliac crest followed by arthrodesis using a locking plate were performed...
2019: Case Reports in Orthopedics
https://read.qxmd.com/read/30810474/multi-joint-rate-of-force-development-testing-protocol-affects-reliability-and-the-smallest-detectible-difference
#7
David Drake, Rodney A Kennedy, Eric S Wallace
Isometric tests have been used to assess rate of force development (RFD), however variation in testing methodologies are known to affect performance outcomes. The aim of this study was to assess the RFD in the isometric squat (ISqT) using two test protocols and two testing angles. Eleven participants (age: 26.8 ± 4.5 years, strength training experience: 7.1 ± 3.03 years) completed test and retest sessions one week apart, whereby two test protocols with respect to duration and instructions were compared...
February 27, 2019: Journal of Sports Sciences
https://read.qxmd.com/read/30800256/integrated-system-for-monitoring-muscular-states-during-elbow-flexor-resistance-training-in-bedridden-patients
#8
Taojin Xu, Zhongwei Jiang, Jongyeob Jeong, Minoru Morita, Hongbin Xu
To improve or maintain the physical function of bedridden patients, appropriate and effective exercises are required during the patient's bed rest. Resistance training (RT) is an effective exercise for improving the physical function of bedridden patients, and the improvement of the physical function is caused by mechanical stimuli associated with RT. Currently, the measured mechanical stimuli are external variables which represent the synthetic effect of multiple muscles and body movements. Important features of stimuli experienced by muscles are of crucial importance in explaining muscular strength and power adaptation...
2019: Journal of Healthcare Engineering
https://read.qxmd.com/read/30789858/repeatability-and-specificity-of-eccentric-force-output-and-the-implications-for-eccentric-training-load-prescription
#9
Mellissa Harden, Alex Wolf, G Gregory Haff, Kirsty M Hicks, Glyn Howatson
Harden, M, Wolf, A, Haff, GG, Hicks, KM, and Howatson, G. Repeatability and specificity of eccentric force output and the implications for eccentric training load prescription. J Strength Cond Res 33(3): 676-683, 2019-Prescribing supramaximal eccentric (ECC) loads based on repetition maximum, isometric (ISO), or concentric-only (CON) strength overlooks the possibility that individuals have a different tolerance for ECC exercise. To inform the prescription of ECC training regimes, this study implemented a test battery that included maximal accentuated-eccentric (ECC+), traditional coupled eccentric-concentric (TRAD), and 2 ISO conditions (90 and 120° knee-joint angle [ISO90 and ISO120, respectively])...
March 2019: Journal of Strength and Conditioning Research
https://read.qxmd.com/read/30788660/comparative-study-of-single-and-dual-nerve-transfers-for-repairing-shoulder-abduction
#10
Feng Xiao, Xin Zhao, Jie Lao
OBJECTIVE: The purpose of this study was to compare the effects of single and dual nerve transfer for the repair of shoulder abduction in patients with upper or upper and middle trunk root avulsion. METHODS: We carried out a retrospective analysis of 20 patients with C5-C6 or C5-C7 root avulsion treated by nerve transfer in our hospital. The patients were divided into two groups according to the different operation methods. In group A, ten patients had transferred the spinal accessory nerve to the suprascapular nerve...
February 20, 2019: Acta Neurochirurgica
https://read.qxmd.com/read/30787652/stretching-combined-with-repetitive-small-length-changes-of-the-plantar-flexors-enhances-their-passive-extensibility-while-not-compromising-strength
#11
Naoki Ikeda, Takayuki Inami, Yasuo Kawakami
Static stretching increases flexibility but can decrease muscle strength; therefore, a method that would avoid the latter has been longed for. In this study, a novel stretching modality was developed that provides repetitive small length changes to the plantar flexor muscles undergoing passive static stretching (minute oscillation stretching). We investigated the effects of minute oscillation stretching on muscle strength and flexibility and its continuance. Isometric plantar flexion strength and maximal ankle joint dorsiflexion angle (dorsiflexion range of motion) were measured in 10 healthy young men (22 ± 2 years) before (pre) and immediately after (post) 3 types of stretching: static stretching, minute oscillation stretching at 15 Hz, and no intervention (control)...
March 2019: Journal of Sports Science & Medicine
https://read.qxmd.com/read/30763138/silica-based-infiltrations-for-enhanced-zirconia-resin-interface-toughness
#12
N C Ramos, M R Kaizer, T M B Campos, J Kim, Y Zhang, R M Melo
Novel silica-based infiltrations on the surface of zirconia have the potential to improve their bondability, allowing for the etching/silane adhesive bonding technique. Nonetheless, adhesively bonded joints are subject to mixed tensile and shear stresses when the restoration is in occlusal service. Thus, we aimed to investigate the effect of 2 novel silica-based infiltrations on the interfacial toughness of adhesively bonded zirconia using the Brazil nut method, which allows for controlled types of stresses to be applied at the interfaces...
February 14, 2019: Journal of Dental Research
https://read.qxmd.com/read/30757914/superior-migration-of-the-femoral-head-in-patients-with-severe-hip-osteoarthritis-influences-the-gait-patterns-of-the-coronal-plane
#13
Masayuki Tazawa, Minori Kurosaki, Tomotaka Inoue, Yoko Ibe, Hiroki Kobayashi, Takanori Kitagawa, Hirotaka Chikuda, Naoki Wada
INTRODUCTION: Patients with hip osteoarthritis (OA) show abnormal movement patterns, including the leaning of the trunk toward the affected limb (Duchenne limp). Patients with severe OA, especially those with OA due to hip dysplasia, show a lateral pelvic drop (Trendelenburg sign). AIM: The aim of this preoperative study is to investigate the relationship between superior migration of the arthritic femoral head, pain, and hip abductor muscle strength, and to clarify the relationship between the coronal plane gait patterns with pain and hip abductor muscle strength...
February 13, 2019: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://read.qxmd.com/read/30712779/relation-between-the-ankle-joint-angle-and-the-maximum-isometric-force-of-the-toe-flexor-muscles
#14
Junichiro Yamauchi, Keiji Koyama
The purpose of this study was to investigate the relationships between the ankle joint angle and maximum isometric force of the toe flexor muscles. Toe flexor strength and electromyography activity of the foot muscles were measured in 12 healthy men at 6 different ankle joint angles with the knee joint at 90 deg in the sitting position. To measure the maximum isometric force of the toe flexor muscles, subjects exerted maximum force on a toe grip dynamometer while the activity levels of the intrinsic and extrinsic plantar muscles were measured...
December 12, 2018: Journal of Biomechanics
https://read.qxmd.com/read/30685137/closing-radial-wedge-osteotomy-for-preiser-disease-clinical-outcomes
#15
Yuji Tomori, Takuya Sawaizumi, Mitsuhiko Nanno, Shinro Takai
PURPOSE: To determine clinical outcomes of Preiser disease treated with closing radial wedge osteotomy (CRWO). METHODS: Seven patients with Preiser disease underwent CRWO. Two wrists had stage 2 disease, 3 had stage 3, 2 had stage 4 (Herbert-Lanzetta classification). Magnetic resonance imaging (MRI) showed that 4 wrists had stage 1 and 3 had stage 2 indicating complete and incomplete necrosis, respectively (Kalainov criteria), before surgery. Two wrists had concomitant Kienböck disease...
January 23, 2019: Journal of Hand Surgery
https://read.qxmd.com/read/30684484/toward-accurate-clinical-spasticity-assessment-validation-of-movement-speed-and-joint-angle-assessments-using-smartphones-and-camera-tracking
#16
Megan Banky, Ross A Clark, Benjamin F Mentiplay, John H Olver, Michelle B Kahn, Gavin Williams
OBJECTIVE: To investigate whether a three-dimensional camera (Microsoft KinectTM ) and a Smartphone can be used to accurately quantify the joint angular velocity and range of motion (ROM) compared to a criterion standard three-dimensional motion analysis system during a lower limb spasticity assessment. DESIGN: Observational, criterion standard comparison study. SETTING: Large rehabilitation centre. PARTICIPANTS: A convenience sample of thirty-five healthy controls, 35 patients with a neurological condition and 34 rehabilitation professionals (physiotherapists and rehabilitation doctors) participated...
January 23, 2019: Archives of Physical Medicine and Rehabilitation
https://read.qxmd.com/read/30676238/test-retest-reliability-of-isokinetic-wrist-strength-and-proprioception-measurements
#17
Baris Seven, Gamze Cobanoglu, Deran Oskay, Nevin Atalay-Guzel
CONTEXT: The evaluation of the wrist strength and proprioception give clinicians and researchers information about effectiveness of their rehabilitation protocol or help diagnosis of various neuromuscular and somatosensorial disorders. Isokinetic dynamometers are considered as the gold standard for these evaluations. However, the studies about test-retest reliability of isokinetic dynamometer are inadequate. OBJECTIVE: The purpose of this study was to determine the test-retest reliability of isokinetic wrist strength and proprioception measurements using the Cybex isokinetic dynamometer...
January 24, 2019: Journal of Sport Rehabilitation
https://read.qxmd.com/read/30655656/relations-between-external-moment-and-movement-of-the-knee-joint-during-the-stance-phase-in-patients-with-severe-knee-osteoarthritis
#18
Takashi Fukaya, Hirotaka Mutsuzaki, Koichi Mori
Background: The relations between external knee moment and the knee joint movement during stance phase of the patients with knee osteoarthritis is unknown well. This study try to clarify the relations between external knee moment and the knee joint movement during stance phase of the patients with knee osteoarthritis. Methods: Subjects comprised 15 patients who had 23 knees with severe osteoarthritis. The knee joint movements and external knee moments while walking were measured using a motion analysis system and a floor-mounted force plate...
January 2019: Journal of Orthopaedics
https://read.qxmd.com/read/30654458/antibiofilm-activity-of-polyamide-11-modified-with-thermally-stable-polymeric-biocide-polyhexamethylene-guanidine-2-naphtalenesulfonate
#19
Olena Moshynets, Jean-François Bardeau, Oksana Tarasyuk, Stanislav Makhno, Tetiana Cherniavska, Oleg Dzhuzha, Geert Potters, Sergiy Rogalsky
The choice of efficient antimicrobial additives for polyamide resins is very difficult because of their high processing temperatures of up to 300 °C. In this study, a new, thermally stable polymeric biocide, polyhexamethylene guanidine 2-naphtalenesulfonate (PHMG-NS), was synthesised. According to thermogravimetric analysis, PHMG-NS has a thermal degradation point of 357 °C, confirming its potential use in joint melt processing with polyamide resins. Polyamide 11 (PA-11) films containing 5, 7 and 10 wt% of PHMG-NS were prepared by compression molding and subsequently characterised by FTIR spectroscopy...
January 16, 2019: International Journal of Molecular Sciences
https://read.qxmd.com/read/30654219/experimental-and-numerical-study-on-tensile-failure-behavior-of-bionic-suture-joints
#20
Yong Cao, Wenzhi Wang, Junpu Wang, Chao Zhang
Sutured architectures with weak interfaces, such as bone or nacres, have a great potential in engineering for the design of joints. In this investigation, which is inspired by the subtle designs that occur in nature, the geometrically structured interfaces of living and fossil organisms are converted into a model for a suture joint. Through a combined numerical and experimental study using three-dimensional (3D) printed suture joint specimens, the tensile failure behavior of first-order bionic suture joints is systematically studied...
January 4, 2019: Journal of the Mechanical Behavior of Biomedical Materials
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