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https://www.readbyqxmd.com/read/27918704/comparison-of-3d-joint-angles-measured-with-the-kinect-2-0-skeletal-tracker-versus-a-marker-based-motion-capture-system
#1
Trent M Guess, Swithin Razu, Amirhossein Jahandar, Marjorie Skubic, Zhiyu Huo
The Microsoft Kinect is becoming a widely used tool for inexpensive, portable measurement of human motion with the potential to support clinical assessments of performance and function. In this study, the relative osteokinematic Cardan joint angles of the hip and knee were calculated using the Kinect 2.0 skeletal tracker. The pelvis segments of the default skeletal model were reoriented and three-dimensional joint angles were compared to a marker-based system during a drop vertical jump and a hip abduction motion...
December 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27893478/loads-and-movement-speeds-dictate-differences-in-power-output-during-circuit-training
#2
Kirk B Roberson, Sean Chowdhari, Morgan White, Joseph F Signorile
Power training has become a common exercise intervention for improving muscle strength, power, and physical function, while reducing injury risk. Few studies, however, have evaluated acute load changes on power output during traditional resistance-training protocols. Therefore, the aim of this study was to quantify the effects of different loading patterns on power output during a single session of circuit resistance training (CRT). Nine males (age=19.4±0.9 y) and eleven females (age=20.6±1.6 y) completed three CRT protocols during separate testing sessions using seven pneumatic exercises...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27882825/validity-and-reliability-of-a-low-cost-digital-dynamometer-for-measuring-isometric-strength-of-lower-limb
#3
Natalia Romero-Franco, Pedro Jiménez-Reyes, Juan A Montaño-Munuera
Lower limb isometric strength is a key parameter to monitor the training process or recognise muscle weakness and injury risk. However, valid and reliable methods to evaluate it often require high-cost tools. The aim of this study was to analyse the concurrent validity and reliability of a low-cost digital dynamometer for measuring isometric strength in lower limb. Eleven physically active and healthy participants performed maximal isometric strength for: flexion and extension of ankle, flexion and extension of knee, flexion, extension, adduction, abduction, internal and external rotation of hip...
November 24, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27871017/predicting-postoperative-gait-in-cerebral-palsy
#4
Omar A Galarraga C, Vincent Vigneron, Bernadette Dorizzi, Néjib Khouri, Eric Desailly
In this work, postoperative lower limb kinematics are predicted with respect to preoperative kinematics, physical examination and surgery data. Data of 115 children with cerebral palsy that have undergone single-event multilevel surgery were considered. Preoperative data dimension was reduced utilizing principal component analysis. Then, multiple linear regressions with 80% confidence intervals were performed between postoperative kinematics and bilateral preoperative kinematics, 36 physical examination variables and combinations of 9 different surgical procedures...
November 9, 2016: Gait & Posture
https://www.readbyqxmd.com/read/27847840/the-effect-of-patellofemoral-pain-syndrome-on-gait-parameters-a-literature-review
#5
REVIEW
Mokhtar Arazpour, Fateme Bahramian, Atefeh Abutorabi, Seyed Taghi Nourbakhsh, Ardeshir Alidousti, Hamidreza Aslani
Patellofemoral pain syndrome (PFPS) is one of the most frequent causes of anterior knee pain in adolescents and adults. This disorder can have a big effect on patients' ability and quality of life and gait. This review included all articles published during 1990 to 2016. An extensive literature search was performed in databases of Science Direct, Google Scholar, PubMed and ISI Web of Knowledge using OR, AND, NOT between the selected keywords. Finally, 16 articles were selected from final evaluation. In PFPS subjects, there was lower gait velocity, decreased cadence, and reduced knee extensor moment in the loading response and terminal stance, delayed peak rear foot eversion during gait and greater hip adduction compared to healthy subjects, while for hip rotation, there was controversy in studies...
October 2016: Archives of Bone and Joint Surgery
https://www.readbyqxmd.com/read/27836503/in-vitro-hip-testing-in-the-international-society-of-biomechanics-coordinate-system
#6
Richard J van Arkel, Jonathan R T Jeffers
Many innovative experiments are designed to answer research questions about hip biomechanics, however many fail to define a coordinate system. This makes comparisons between studies unreliable and is an unnecessary hurdle in extrapolating experimental results to clinical reality. The aim of this study was to present a specimen mounting protocol which aligns and registers hip specimens in the International Society of Biomechanics (ISB) coordinate system, which is defined by bony landmarks that are identified by palpation of the patient׳s body...
October 29, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27821928/the-effect-of-gluteus-medius-strengthening-on-the-knee-joint-function-score-and-pain-in-meniscal-surgery-patients
#7
Eun-Kyung Kim
[Purpose] The purpose of this study was to analyze the effect of gluteus medius activity strengthening due to squat with isometric hip adduction and hip abduction in side-lying exercise on knee joint function index and pain in meniscal surgery patients. [Subjects and Methods] This study selected sample of 26 patients who had meniscal surgery more than 4 weeks ago. The patients were divided into squat with isometric hip adduction exercise group I (n=8), hip abduction in side-lying exercise group II (n=9), and combined exercise group III...
October 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27816023/kinematics-and-kinetics-during-stair-ascent-in-individuals-with-gluteal-tendinopathy
#8
Kim Allison, Bill Vicenzino, Kim L Bennell, Tim V Wrigley, Alison Grimaldi, Paul W Hodges
BACKGROUND: Individuals with gluteal tendinopathy commonly report lateral hip pain and disability during stair ascent. This study aimed to compare kinematics and kinetics between individuals with and without gluteal tendinopathy during a step up task. METHODS: 35 individuals with unilateral gluteal tendinopathy and 35 pain-free controls underwent three-dimensional motion analysis of stance phase during stair ascent. An analysis of covariance was performed to compare hip, pelvis and trunk kinematic and kinetic variables between groups...
October 5, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27802796/patients-with-chondrolabral-pathology-have-bilateral-functional-impairments-12-to-24-months-after-unilateral-hip-arthroscopy-a-cross-sectional-study
#9
Joanne L Kemp, May Arna Risberg, Anthony G Schache, Michael Makdissi, Michael G Pritchard, Kay M Crossley
Study Design Cross-sectional study. Background Functional task performance in patients with chondrolabral pathology following hip arthroscopy is unknown. Objectives To investigate in people with chondrolabral pathology following hip arthroscopy (1) the bilateral differences in functional task performance compared to controls, (2) the association of hip muscle strength with functional task performance, and (3) the association of functional task performance scores with good outcome, as measured by International Hip Outcome Tool score...
November 2016: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/27755353/predicting-the-functional-roles-of-knee-joint-muscles-from-internal-joint-moments
#10
Teresa E Flaxman, Tine Alkjær, Erik B Simonsen, Michael R Krogsgaard, Daniel L Benoit
INTRODUCTION: Knee muscles are commonly labelled as flexors or extensors and aptly stabilize the knee against sagittal plane loads. However, how these muscles stabilize the knee against adduction-abduction and rotational loads remains unclear. Our study sought to: (1) classify muscle roles as they relate to joint stability by quantifying the relationship between individual muscle activation patterns and internal net joint moments in all three loading planes, and (2) determine if these roles change with increasing force levels...
October 14, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27755333/biomechanical-evaluation-of-the-femoral-neck-system-in-unstable-pauwels-iii-femoral-neck-fractures-a-comparison-to-the-dynamic-hip-screw-and-cannulated-screws
#11
Karl Stoffel, Ivan Zderic, Florian Gras, Christoph Sommer, Ursula Eberli, David Mueller, Martin Oswald, Boyko Gueorguiev
OBJECTIVES: To evaluate the biomechanical performance of Femoral Neck System (FNS) in comparison to established methods for fixation of femoral neck fractures in a cadaveric model. METHODS: Twenty pairs of fresh-frozen human cadaveric femora were instrumented either with DHS-Screw, DHS-Blade, 3CS or with FNS in a partially paired design. The specimens were randomized to two paired treatment groups based on the BMD, namely DHS-Screw/DHS-Blade and FNS/3CS. A reduced unstable femoral neck fracture with postero-caudal comminution, AO/OTA 31-B2...
October 13, 2016: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/27755283/hip-biomechanics-are-altered-in-male-runners-with-achilles-tendinopathy
#12
Mark W Creaby, Conor Honeywill, Melinda M Franettovich Smith, Anthony G Schache, Kay M Crossley
PURPOSE: Achilles tendinopathy (AT) is a prevalent injury in running sports. Understanding the biomechanical factors associated with AT will assist in its management and prevention. The purpose of this study was to compare hip and ankle kinematics and kinetics in runners with and without AT. METHODS: Fourteen male runners with AT and eleven healthy male runners (CTRL) ran over-ground whilst lower-limb joint motion and ground reaction force data were synchronously captured...
October 17, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27753742/changes-in-gait-over-a-30-min-walking-session-in-obese-females
#13
Bhupinder Singh, Huy Vo, Shelby L Francis, Kathleen F Janz, John H Yack
PURPOSE: This study assessed the biomechanical gait changes in obese and normal weight female adult subjects following a commonly recommended 30-minute walking session. Hip and knee adduction and extensor moments, which are the primary modulators of frontal and sagittal plane load distribution were hypothesized to increase in obese females following a 30-minute walking period, resulting in more stress across the hip and knee joint. METHODS: Ten obese (37.7 ± 4...
October 6, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27747935/biomechanical-differences-related-to-leg-dominance-were-not-found-during-a-cutting-task
#14
E K Greska, N Cortes, S I Ringleb, J A Onate, B L Van Lunen
Previous studies have shown conflicting information regarding leg dominance as an etiological factor for the risk of anterior cruciate ligament (ACL) injuries. It remains unclear if lower extremity neuromechanical limb asymmetries exist in experienced athletes. The purpose of this study was to evaluate lower extremity neuromechanical effects of leg dominance in female collegiate soccer athletes during an unanticipated side-step cutting task. Twenty female collegiate soccer players completed an unanticipated side-step cutting task, using their dominant and non-dominant legs...
October 17, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27746490/iliotibial-band-syndrome-following-hip-arthroscopy-an-unreported-complication
#15
Roberto Seijas, Andrea Sallent, María Galán, Pedro Alvarez-Diaz, Oscar Ares, Ramón Cugat
BACKGROUND: Hip arthroscopy is considered a safe procedure, considering the relatively low rate of complications. Despite several complications have been described following this surgical procedure, the present event has not yet been described. The purpose of the present study is to report an unpublished complication following hip arthroscopy, after reviewing 162 hip arthroscopies and finding iliotibial band syndrome (ITBS) in the knee during followup. MATERIALS AND METHODS: A retrospective review of 162 hip arthroscopies performed between September 2007 and June 2011 was carried out, evaluating patients who presented ITBS during followup...
September 2016: Indian Journal of Orthopaedics
https://www.readbyqxmd.com/read/27739565/a-novel-fluoroscopic-approach-to-assessing-patient-positioning-in-total-hip-arthroplasty-accuracy-and-the-influence-of-body-mass-index
#16
Anton P Lambers, Robert Jennings, Andrew T Bucknill
INTRODUCTION: Accurate prosthetic cup placement is important in total hip arthroplasty (THA) and can be influenced by patient positioning. This study aims to assess the accuracy of patient positioning prior to THA, describe a new technique of assessment, and evaluate the influence of body mass index (BMI) on positioning error. METHODS: A consecutive series of 37 patients undergoing unilateral THA were investigated. After patient positioning in lateral decubitus, a lateral fluoroscopic image through the table was taken...
October 8, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27731892/hip-joint-mobility-in-free-ranging-rhesus-macaques
#17
Ashley S Hammond, Victoria P Johnson, James P Higham
OBJECTIVES: We aimed to test for differences in hip joint range of motion (ROM) between captive and free-ranging rhesus macaques (Macaca mulatta), particularly for hip joint abduction, which previous studies of captive macaques have found to be lower than predicted. MATERIALS AND METHODS: Hip ROM was assessed following standard joint measurement methodology in anesthetized adult free-ranging rhesus macaques (n = 39) from Cayo Santiago, and compared with published ROM data from captive rhesus macaques (n = 16) (Hammond, , American Journal of Physical Anthropology)...
October 12, 2016: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/27718393/the-effects-of-fatigue-on-lower-extremity-kinematics-kinetics-and-joint-coupling-in-symptomatic-female-runners-with-iliotibial-band-syndrome
#18
Allison M Brown, Rebecca A Zifchock, Howard J Hillstrom, Jinsup Song, Carole A Tucker
BACKGROUND: Altered hip and knee kinematics and joint coupling have been documented in runners with iliotibial band syndrome. Symptoms often present themselves after several minutes of running, yet the effect of fatigue warrants further exploration. The purpose of this study was to determine the effect of a run to fatigue in runners with iliotibial band syndrome, as compared to healthy controls. METHODS: Twenty uninjured and 12 female runners with iliotibial band syndrome performed a treadmill run to fatigue...
September 30, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27697627/body-weight-unloading-modifications-on-frontal-plane-joint-moments-impulses-and-center-of-pressure-during-overground-gait
#19
Arielle G Fischer, Alon Wolf
BACKGROUND: Body weight unloading is a common method of gait rehabilitation. However, little is known about its effects on the overground gait biomechanical parameters which were often confounded by the walking modality (treadmill) or the speed variability when subjects walked overground while having to pull the body weight unloading system to which they were attached. By designing a mechanical device that pulled the system at a constant speed, we were able to assess the unique effects of body weight unloading on healthy subjects' kinetics during overground gait...
September 13, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27693099/distinct-cut-task-strategy-in-australian-football-players-with-a-history-of-groin-pain
#20
Suzi Edwards, Hiram C Brooke, Jill L Cook
OBJECTIVES: This study aimed to explore the differences in the magnitude of movement variability and strategies utilized during an unanticipated cut task between players with and without a history of groin pain. DESIGN: Cross-sectional design. SETTING: Biomechanics laboratory. PARTICIANTS: Male Australian football players with (HISTORY; n = 7) or without (CONTROL; n = 10) a history of groin pain. OUTCOME MEASURES: Three-dimensional ground reaction forces (GRF) and kinematics were recorded during 10 successful trials of an unanticipated cut task, and isokinetic hip adduction and abduction strength...
July 22, 2016: Physical Therapy in Sport
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