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hip biomechanics

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https://www.readbyqxmd.com/read/29680494/femur-loading-in-feet-first-fall-experiments-using-an-anthropomorphic-test-device
#1
Angela Thompson, Gina Bertocci, Craig Smalley
BACKGROUND: Femur fractures are a common orthopedic injury in young children. Falls account for a large portion of accidental femur fractures in young children, but there is also a high prevalence of femur fractures in child abuse, with falls often provided as false histories. Objective information regarding fracture potential in short distance fall scenarios may aid in assessing whether a child's injuries are the result of abuse or an accidental fall. Knowledge of femur loading is the first step towards understanding likelihood of fracture in a fall...
March 31, 2018: Journal of Forensic and Legal Medicine
https://www.readbyqxmd.com/read/29671697/a-biomechanical-comparison-of-dominant-and-non-dominant-limbs-during-a-side-step-cutting-task
#2
Christine D Pollard, Marc F Norcross, Sam T Johnson, Amanda E Stone, Eunwook Chang, Mark A Hoffman
Numerous studies have investigated anterior cruciate ligament (ACL) injury risk by examining gender differences in knee and hip biomechanics during a side-step cutting manoeuvre since it is known that ACL injury often occurs during such a task. Recent investigations have also examined lower extremity (LE) biomechanics during side-step cutting in individuals following ACL reconstruction (ACLR). Common research practice is to compare knee and hip biomechanics of the dominant limb between groups but this can add considerable complexity for clinicians and researchers...
April 19, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29665068/osteoporosis-and-hip-fracture-risk-from-routine-computed-tomography-scans-the-fracture-osteoporosis-and-ct-utilization-study-focus
#3
Annette L Adams, Heidi Fischer, David L Kopperdahl, David C Lee, Dennis M Black, Mary L Bouxsein, Shireen Fatemi, Sundeep Khosla, Eric S Orwoll, Ethel S Siris, Tony M Keaveny
Methods now exist for analyzing previously taken clinical computed tomography (CT) scans to measure a dual-energy X-ray absorptiometry (DXA)-equivalent bone mineral density (BMD) at the hip and a finite element analysis-derived femoral strength. We assessed the efficacy of this "biomechanical CT" (BCT) approach for identifying patients at high risk of incident hip fracture in a large clinical setting. Using a case-cohort design sampled from 111,694 women and men aged 65 or older who had a prior hip CT scan, a DXA within 3 years of the CT, and no prior hip fracture, we compared those with subsequent hip fracture (n = 1959) with randomly selected sex-stratified controls (n = 1979) and analyzed their CT scans blinded to all other data...
April 17, 2018: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29664884/biomechanical-testing-of-a-3-hole-versus-a-4-hole-sliding-hip-screw-in-the-presence-of-a-retrograde-intramedullary-nail-for-ipsilateral-intertrochanteric-and-femur-shaft-fractures
#4
Michael Olsen, Peter Goshulak, Meghan C Crookshank, Joel Moktar, Ignace J Brazda, Emil H Schemitsch, Radovan Zdero
OBJECTIVE: The goal of this study was to compare a 3-hole vs. a 4-hole sliding hip screw (SHS) in the presence of a retrograde intramedullary (RIM) nail for fixing intertrochanteric and comminuted midshaft femur fractures. METHODS: Mechanical tests were performed on 10 matched pairs of human cadaveric femurs that were osteotomized and then fixed using a 3-hole SHS vs. the traditional "gold standard" 4-hole SHS in the presence of a RIM nail. RESULTS: Data showed no differences between the 3-hole SHS with RIM nail vs...
April 3, 2018: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29658524/reference-values-of-spatiotemporal-parameters-joint-angles-ground-reaction-forces-and-plantar-pressure-distribution-during-normal-gait-in-young-women
#5
Anna Fryzowicz, Michał Murawa, Jarosław Kabaciński, Agata Rzepnicka, Lechosław B Dworak
PURPOSE: The aim of this study was to establish the reference values of spatiotemporal parameters, joint angles, ground reaction forces and plantar pressure distribution collected simultaneously on the same measurement path during normal gait in a homogenous group of young, healthy women. METHODS: The studied group consisted of 28 healthy women aged 21 years on average. The motion capture system BTS Smart-D, 2 AMTI force platforms and Footscan pedobarographic platform were used in this research...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29658520/biomechanical-characterization-of-slope-walking-using-musculoskeletal-model-simulation
#6
Masayuki Kawada, Kazutaka Hata, Ryoji Kiyama, Tetsuo Maeda, Kazunori Yone
PURPOSE: Upslope and downslope walking are basic activities necessary for normal daily living in community, and they impose greater joint load on the lower extremities than during level walking. Thus, the purpose of this study was to quantify the resultant and shear forces in the hip and knee joints during slope walking. METHODS: Twelve healthy volunteers were evaluated when walking under level and 10° up- and downslope conditions. Three-dimensional gait analysis was conducted using a 7-camera optoelectronic motion analysis system combined with a force plate to measure ground reactive force...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29653340/magnitude-and-variability-of-gait-characteristics-when-walking-on-an-irregular-surface-at-different-speeds
#7
Stephanie Blair, Mark J Lake, Rui Ding, Thorsten Sterzing
Different modes of perturbations have been used to understand how individuals negotiate irregular surfaces, with a general notion that increased locomotion variability induces a positive training stimulus. Individuals tend to walk slower when initially exposed to such locomotion tasks, potentially influencing the magnitude and variability of biomechanical parameters. This study investigated theeffects of gait speed on lower extremity biomechanics when walking on an irregular (IS) and regular surface (RS). Twenty physically active males walked on a RS and IS at three different speeds (4 km/h, 5 km/h, 6 km/h)...
April 10, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29653242/effect-of-combined-flexion-and-external-rotation-on-measurements-of-the-proximal-femur-from-anteroposterior-pelvic-radiographs
#8
J O'Connor, M Rutherford, J Hill, D Beverland, N Dunne, A Lennon
INTRODUCTION: Fixed flexion and external rotation contractures are common in patients with hip osteoarthritis and in particular before total hip replacement (THR). We aimed to answer the following question: how does combined flexion and external rotation of the femur influence the radiographic assessment of 1) femoral offset (FO) 2) neck-shaft angle (NSA) and 3) distance (parallel to the femoral axis) from greater trochanter to femoral head centre (GT-FHC)? HYPOTHESIS: Combined flexion and external rotation impact the accuracy of two-dimensional (2D) proximal femur measurements...
April 10, 2018: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29643694/bone-preserving-techniques-for-explanting-the-well-fixed-cemented-acetabular-component
#9
Jarrad Stevens, Gavin Macpherson, Colin Howie
Background: Removal of a well-fixed, cemented acetabular component at the time of revision hip surgery can be complex. It is essential to remove the implant and cement mantle in a timely fashion while preserving bone stock and osseous integrity. The biomechanical properties of polymethylmethacrylate cement and polyethylene can be utilised to aid with the removal of well cemented implants which are often harder than the surrounding bone. While removal of loose components may be relatively straightforward, the challenge for the revision arthroplasty surgeon often involves the removal of well-fixed implants...
June 2018: Journal of Orthopaedics
https://www.readbyqxmd.com/read/29626280/automated-muscle-segmentation-from-ct-images-of-the-hip-and-thigh-using-a-hierarchical-multi-atlas-method
#10
Futoshi Yokota, Yoshito Otake, Masaki Takao, Takeshi Ogawa, Toshiyuki Okada, Nobuhiko Sugano, Yoshinobu Sato
PURPOSE: Patient-specific quantitative assessments of muscle mass and biomechanical musculoskeletal simulations require segmentation of the muscles from medical images. The objective of this work is to automate muscle segmentation from CT data of the hip and thigh. METHOD: We propose a hierarchical multi-atlas method in which each hierarchy includes spatial normalization using simpler pre-segmented structures in order to reduce the inter-patient variability of more complex target structures...
April 6, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29625413/a-novel-approach-for-the-detection-and-exploration-of-joint-coupling-patterns-in-the-lower-limb-kinetic-chain
#11
Kevin Deschamps, Maarten Eerdekens, Jurre Geentjens, Lieselot Santermans, Lien Steurs, Bart Dingenen, Maarten Thysen, Filip Staes
BACKGROUND: A comprehensive perspective on foot and lower limb joint coupling is lacking since previous studies did not consider the multi-articular nature of the foot and lower limb neither accounted for biomechanical heterogeneity. RESEARCH QUESTION: The current manuscript describes a novel methodological process for detection and exploration of joint coupling patterns in the lower limb kinetic chain. METHODS: The first stage of the methodological process encompasses the measurement of 3D joint kinematics of the foot and lower limb kinetic chain during dynamic activities...
March 31, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29625190/sacroiliac-joint-dysfunction-patients-exhibit-altered-movement-strategies-when-performing-a-sit-to-stand-task
#12
Robyn A Capobianco, Daniel F Feeney, Jana R Jeffers, Erika Nelson-Wong, Joseph Morreale, Alena M Grabowski, Roger M Enoka
OF BACKGROUND DATA: The ability to rise from a chair is a basic functional task that is frequently compromised in individuals diagnosed with orthopedic disorders in the low back and hip. There is no published literature that describes how this task is altered by sacroiliac joint dysfunction (SIJD). PURPOSE: To compare lower extremity biomechanics and the onset of muscle activity when rising from a chair in individuals with SIJD and healthy persons. STUDY DESIGN: Six women with unilateral SIJD and six age-matched healthy controls performed a sit-to-stand task while we measured kinematics, kinetics, and muscle activity...
April 3, 2018: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29622257/editorial-commentary-what-irks-a-hip-arthroscopist-intraoperative-anchor-failure
#13
EDITORIAL
Shane J Nho, William H Neal
Intraoperative suture anchor failure is a seemingly unavoidable event during hip arthroscopy and it can happen to the best of us. To date, biomechanical cadaveric studies saturate hip anchor failure literature with only one known, published in vivo investigation. We now know that intraoperative anchor failure is an uncommon occurrence that does not significantly vary between basic population demographics. However, we have only been provided with foundational knowledge, and our community must continue to expand upon the basics...
April 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29613821/lower-extremity-kinematics-differed-between-a-controlled-drop-jump-and-volleyball-takeoffs
#14
Bradley S Beardt, Myranda R McCollum, Taylour J Hinshaw, Jacob S Layer, Margaret A Wilson, Qin Zhu, Boyi Dai
Previous studies utilizing jump-landing biomechanics to predict anterior cruciate ligament injuries have shown inconsistent findings. The purpose of this study was to quantify the differences and correlations in jump-landing kinematics between a drop-jump, a controlled volleyball-takeoff, and a simulated-game volleyball-takeoff. Seventeen female volleyball players performed these three tasks on a volleyball court while three-dimensional kinematic data were collected by three calibrated camcorders. Participants demonstrated significantly increased jump height, shorter stance time, increased time differences in initial contact between two feet, increased knee and hip flexion at initial contact and decreased peak knee and hip flexion for both left and right legs, and decreased knee-ankle distance ratio at the lowest height of mid-hip for the two volleyball-takeoffs compared with the drop-jump (p < 0...
April 3, 2018: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29613820/the-effects-of-walking-workstations-on-biomechanical-performance
#15
Daniel M Grindle, Lauren Baker, Mike Furr, Tim Puterio, Brian Knarr, Jill Higginson
Prolonged sitting has been associated with negative health effects. Walking workstations have become increasingly popular in the workplace. There is a lack of research on the biomechanical effect of walking workstations. This study analyzed whether walking while working alters normal gait patterns. Nine participants completed four walking trials at 2.4 km·h-1 and 4.0 km·h-1 : baseline walking condition, walking while performing a math task, a reading task, and a typing task. Biomechanical data were collected using standard motion capture procedures...
April 3, 2018: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29609158/lower-extremity-power-training-improves-healthy-old-adults-gait-biomechanics
#16
Azusa Uematsu, Tibor Hortobágyi, Kazushi Tsuchiya, Norio Kadono, Hirofumi Kobayashi, Tomoya Ogawa, Shuji Suzuki
PURPOSE: Age-related slowing of gait speed predicts many clinical conditions in later life. We examined the kinematic and kinetic mechanisms of how lower extremity power training increases healthy old adults' gait speed. METHODS: We randomly allocated old adults to a training (age 74.3 y, 9 males, 6 females) and a control group (age 73.6 y, 3 males, 4 females) and compared the biomechanics of habitual and fast gait before and after 16 sessions (8 weeks) of lower extremity power training...
March 26, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29602475/concurrent-validation-of-an-inertial-measurement-system-to-quantify-kicking-biomechanics-in-four-football-codes
#17
Stephanie Blair, Grant Duthie, Sam Robertson, William Hopkins, Kevin Ball
Wearable inertial measurement systems (IMS) allow for three-dimensional analysis of human movements in a sport-specific setting. This study examined the concurrent validity of a IMS (Xsens MVN system) for measuring lower extremity and pelvis kinematics in comparison to a Vicon motion analysis system (MAS) during kicking. Thirty footballers from Australian football (n = 10), soccer (n = 10), rugby league and rugby union (n = 10) clubs completed 20 kicks across four conditions. Concurrent validity was assessed using a linear mixed-modelling approach, which allowed the partition of between and within-subject variance from the device measurement error...
March 21, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29602303/hop-distance-symmetry-does-not-indicate-normal-landing-biomechanics-in-adolescent-athletes-with-recent-anterior-cruciate-ligament-reconstruction
#18
Tishya A L Wren, Nicole M Mueske, Christopher H Brophy, J Lee Pace, Mia J Katzel, Bianca R Edison, Curtis D VandenBerg, Tracy L Zaslow
Study Design Retrospective cohort. Background Return to sport (RTS) protocols after anterior cruciate ligament reconstruction (ACLR) often include assessment of hop distance symmetry. However, it is unclear if movement deficits are present regardless of hop symmetry. Objectives To assess biomechanics and symmetry of adolescent athletes following ACLR during a single leg hop for distance. Methods Forty-six patients with ACLR (5-12 months post-surgery; 27 female; age 15.6, SD 1.7 years) were classified as asymmetric (operative limb hop distance <90% of non-operative limb; n=17) or symmetric (n=29)...
March 30, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29589046/-surgical-therapy-of-ischiofemoral-impingement-by-lateralizing-intertrochanteric-osteotomy
#19
REVIEW
C Suren, R Burgkart, I J Banke, G Hertel, J Schauwecker, R von Eisenhart-Rothe, H Gollwitzer
OBJECTIVE: Lateralizing, derotating intertrochanteric varus osteotomy to increase the ischiofemoral space to counter painful impingement of the lesser trochanter and the os ischium with resulting entrapment of quadratus femoris muscle. INDICATIONS: Symptomatic ischiofemoral impingement (IFI) caused by Coxa valga et antetorta, Coxa valga or Coxa antetorta, or a short femoral neck. CONTRAINDICATIONS: Anatomic configuration suggestive of IFI in asymptomatic patients...
March 27, 2018: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/29587391/nondestructive-estimation-of-muscle-contributions-to-sts-training-with-different-loadings-based-on-wearable-sensor-system
#20
Kun Liu, Yong Liu, Jianchao Yan, Zhenyuan Sun
Partial body weight support or loading sit-to-stand (STS) rehabilitation can be useful for persons with lower limb dysfunction to achieve movement again based on the internal residual muscle force and external assistance. To explicate how the muscles contribute to the kinetics and kinematics of STS performance by non-invasive in vitro detection and to nondestructively estimate the muscle contributions to STS training with different loadings, a wearable sensor system was developed with ground reaction force (GRF) platforms, motion capture inertial sensors and electromyography (EMG) sensors...
March 25, 2018: Sensors
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