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https://www.readbyqxmd.com/read/27909663/the-quebec-city-slider-a-technique-for-capsular-closure-and-plication-in-hip-arthroscopy
#1
Travis J Menge, Jorge Chahla, Eduardo Soares, Justin J Mitchell, Marc J Philippon
Biomechanical and clinical studies have shown that the hip joint capsule plays an important role in maintaining stability and hip mechanics, including rotation and translation. The recent literature has shown that capsule closure after hip arthroscopy helps to restore stability. Without restoration of the native anatomy, the hip joint may translate when patients engage in activities that place force across the hip, leading to either microinstability or frank dislocation. The purpose of this note is to describe our preferred technique of capsular closure or plication during hip arthroscopy...
October 2016: Arthroscopy Techniques
https://www.readbyqxmd.com/read/27907000/whole-body-vibration-treatments-in-postmenopausal-women-can-improve-bone-mineral-density-results-of-a-stimulus-focussed-meta-analysis
#2
Antonio Fratini, Tecla Bonci, Anthony M J Bull
Whole body vibration treatment is a non-pharmacological intervention intended to stimulate muscular response and increase bone mineral density, particularly for postmenopausal women. The literature related to this topic is controversial, heterogeneous, and unclear despite the prospect of a major clinical effect.The aim of this study was to identify and systematically review the literature to assess the effect of whole body vibration treatments on bone mineral density (BMD) in postmenopausal women with a specific focus on the experimental factors that influence the stimulus...
2016: PloS One
https://www.readbyqxmd.com/read/27904791/current-concepts-in-biomechanical-interventions-for-patellofemoral-pain
#3
Richard W Willy, Erik P Meira
: Patellofemoral pain (PFP) has historically been a complex and enigmatic issue. Many of the factors thought to relate to PFP remain after patients' symptoms have resolved making their clinical importance difficult to determine. The tissue homeostasis model proposed by Dye in 2005 can assist with understanding and implementing biomechanical interventions for PFP. Under this model, the goal of interventions for PFP should be to re-establish patellofemoral joint (PFJ) homeostasis through a temporary alteration of load to the offended tissue, followed by incrementally restoring the envelope of function to the baseline level or higher...
December 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27897410/androgen-deprivation-causes-selective-deficits-in-the-biomechanical-leg-muscle-function-of-men-during-walking-a-prospective-case-control-study
#4
Ada S Cheung, Hans Gray, Anthony G Schache, Rudolf Hoermann, Daryl Lim Joon, Jeffrey D Zajac, Marcus G Pandy, Mathis Grossmann
BACKGROUND: Although muscle mass declines with testosterone deficiency in men, previous studies of muscle function have not demonstrated consistent deficits, likely due to relatively insensitive methodology. Our objective was to determine the effects of testosterone deprivation on the biomechanical function of individual lower-limb muscles. METHODS: We conducted a 12-month prospective, observational case-control study of 34 men newly commencing androgen deprivation treatment (ADT) for prostate cancer and 29 age-matched prostate cancer controls...
August 2, 2016: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/27893757/assessing-the-acetabular-cup-implant-primary-stability-by-impact-analyses-a-cadaveric-study
#5
Adrien Michel, Romain Bosc, Jean-Paul Meningaud, Philippe Hernigou, Guillaume Haiat
BACKGROUND: The primary stability of the acetabular cup (AC) implant is an important determinant for the long term success of cementless hip surgery. However, it remains difficult to assess the AC implant stability due to the complex nature of the bone-implant interface. A compromise should be found when inserting the AC implant in order to obtain a sufficient implant stability without risking bone fracture. The aim of this study is to evaluate the potential of impact signals analyses to assess the primary stability of AC implants inserted in cadaveric specimens...
2016: PloS One
https://www.readbyqxmd.com/read/27886360/high-proximal-migration-in-cemented-acetabular-revisions-operated-with-bone-impaction-grafting-47-revision-cups-followed-with-rsa-for-17-years
#6
Maziar Mohaddes, Peter Herberts, Henrik Malchau, Per-Erik Johanson, Johan Kärrholm
BACKGROUND: Bone impaction grafting is a biologically and mechanically appealing option in acetabular revision surgery, allowing restitution of the bone stock and restoration of the biomechanics. We analysed differences in proximal migration of the revision acetabular components when bone impaction grafting is used together with a cemented or an uncemented cup. PATIENTS AND METHODS: 43 patients (47 hips), revised due to acetabular loosening and judged to have less than 50% host bone-implant contact were included...
November 22, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27886355/acetabular-spacers-in-2-stage-hip-revision-is-it-worth-it-a-single-centre-retrospective-study
#7
Giorgio Burastero, Marco Basso, Giuliana Carrega, Luca Cavagnaro, Francesco Chiarlone, Carlo Salomone, Gabriele Papa, Lamberto Felli
PURPOSE: The aim of this work is to evaluate an acetabular antibiotic loaded bone cement spacer in 2-stage revision surgery as a potential approach able to reduce complications during the inter-stage period (i.e. dislocation, acetabular wear), as well as simplify 2-stage hip revision surgery and improve hip biomechanics. METHODS: We performed a retrospective comparative study and evaluated clinical, radiological and surgical data of 71 patients affected by periprosthetic hip infection who were treated with 2-stage exchange...
November 25, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27882360/static-and-dynamic-predictors-of-foot-progression-angle-in-individuals-with-and-without-diabetes-mellitus-and-peripheral-neuropathy
#8
Ericka N Merriwether, Mary K Hastings, Michael J Mueller, Kathryn L Bohnert, Michael J Strube, Darrah R Snozek, David R Sinacore
INTRODUCTION: Foot progression angle (FPA) is a predictor of elevated regional plantar stresses and loads, which are indicators of dermal injury risk in individuals with diabetes mellitus and peripheral neuropathy (DMPN). FPA accounts for 15-45% of the variance in plantar stresses and loads in adults with DMPN. However, the biomechanical factors underlying an "out-toeing" gait pattern in this clinical population have not been examined. The primary purpose of this study was to identify static and dynamic predictors of foot progression angle magnitude in adults with and without DMPN...
2016: Annals of Gerontology and Geriatric Research
https://www.readbyqxmd.com/read/27874298/volitional-spine-stabilization-during-a-drop-vertical-jump-from-different-landing-heights-implications-for-anterior-cruciate-ligament-injury
#9
Ram Haddas, Troy Hooper, C Roger James, Phillip S Sizer
CONTEXT:  Volitional spine stabilization (VSS) during dynamic activities may alter trunk motion, but the role of the core musculature in positioning the trunk during landing tasks is unclear. OBJECTIVE:  To determine whether volitional core-muscle activation incorporated during a drop vertical jump alters lower extremity kinematics and kinetics, as well as trunk and lower extremity muscle activity at different landing heights. DESIGN:  Controlled laboratory study...
November 22, 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27865814/obesity-and-the-role-of-bariatric-surgery-in-the-surgical-management-of-osteoarthritis-of-the-hip-and-knee-a-review-of-the-literature
#10
REVIEW
Bryan D Springer, Jonathan T Carter, Alexander S McLawhorn, Keith Scharf, Mitchell Roslin, Kara J Kallies, John M Morton, Shanu N Kothari
Obesity accelerates the development of osteoarthritis of the knee and hip by exerting deleterious effects on joints through both biomechanical and also systemic inflammatory changes. The objective of this review was to evaluate the impact of obesity on lower limb biomechanics and total joint arthroplasty outcomes, as well as weight changes after joint arthroplasty and the role of bariatric surgery among patients requiring joint arthroplasty. The currently published data indicate that weight loss increases swing time, stride length, gait speed, and lower extremity range of motion...
September 14, 2016: Surgery for Obesity and related Diseases: Official Journal of the American Society for Bariatric Surgery
https://www.readbyqxmd.com/read/27865130/effects-of-fatigue-on-lower-limb-pelvis-and-trunk-kinematics-and-muscle-activation-gender-differences
#11
Giovanna Camparis Lessi, Ana Flávia Dos Santos, Luis Fylipe Batista, Gabriela Clemente de Oliveira, Fábio Viadanna Serrão
BACKGROUND: Muscle fatigue is associated with biomechanical changes that may lead to anterior cruciate ligament (ACL) injuries. Alterations in trunk and pelvis kinematics may also be involved in ACL injury. Although some studies have compared the effects of muscle fatigue on lower limb kinematics between men and women, little is known about its effects on pelvis and trunk kinematics. The aim of the study was to compare the effects of fatigue on lower limb, pelvis and trunk kinematics and muscle activation between men and women during landing...
November 9, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27856067/posterior-cruciate-ligament-retention-or-substitution-during-total-knee-arthroplasty-does-not-affect-long-term-bone-mineral-density-or-quality
#12
Yoshinori Ishii, Hideo Noguchi, Junko Sato, Koji Todoroki, Shin-Ichi Toyabe
BACKGROUND: Physical activity is recognized as one of the factors that influence bone mineral density (BMD) and bone quality after total knee arthroplasty (TKA). According to biomechanical analyses after posterior cruciate ligament (PCL) retaining (PCLR) and substituting (PCLS) TKA, each implant design has different kinematics and kinetics. The purposes of this study were: (1) to perform within-patient comparisons of the midterm and long-term effects of PCL retention in mobile-bearing TKA on proximal femur and tibia BMD and calcaneus bone quality measured using ultrasound and (2) to identify correlations between them...
October 26, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27849459/the-prevalence-of-gait-deviations-in-individuals-with-transtibial-amputation
#13
Christopher A Rábago, Jason M Wilken
Individuals with a transtibial amputation (TTA) are at increased risk for developing secondary musculoskeletal disorders as a result of multiple gait deviations. These deviations are primarily characterized using group mean comparisons, which do not establish if deviations are prevalent, of large magnitude, or both. In contrast, use of normative reference ranges and prevalence specifically identifies the percentage of individuals outside of a predefined acceptable range. The purpose of this study was to identify and characterize gait deviations in service members with unilateral TTA using group mean comparisons and normative reference ranges (able-bodied mean ± 2 SD)...
November 2016: Military Medicine
https://www.readbyqxmd.com/read/27836503/in-vitro-hip-testing-in-the-international-society-of-biomechanics-coordinate-system
#14
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/27834558/comprehensive-gait-analysis-of-healthy-older-adults-who-have-undergone-long-distance-walking
#15
Mustafa M O Elhadi, Christina Z Ma, Duo W C Wong, Anson H P Wan, Winson C C Lee
Many older adults do not adhere to the recommended physical activity levels. This study examines the gait changes upon long-distance walking among healthy older adults. Gait tests of 24 adults aged 65 or more were conducted at the baseline, at the end of 30 and 60 minutes of treadmill walk. Spatial temporal, kinematic and kinetic gait data were computed. Perceived level of exertion was evaluated for each subject. Ten subjects (Group B) perceived higher exertion level than the remaining fourteen subjects (Group A)...
November 11, 2016: Journal of Aging and Physical Activity
https://www.readbyqxmd.com/read/27830485/lateral-compartment-osteophytes-are-not-associated-with-lateral-compartment-cartilage-degeneration-in-arthritic-varus-knees
#16
Wenzel Waldstein, Maximilian F Kasparek, Martin Faschingbauer, Reinhard Windhager, Friedrich Boettner
BACKGROUND: Progression of arthritis in the lateral compartment is one of the main failure modes of unicompartmental knee arthroplasty (UKA). The decision regarding whether to perform a medial UKA sometimes is made based on whether lateral-compartment osteophytes are visible on plain radiographs obtained before surgery, but it is not clear whether the presence of lateral-compartment osteophytes signifies that the cartilage in the lateral compartment is arthritic. QUESTIONS/PURPOSES: (1) Is the presence of lateral compartment osteophytes associated with biomechanical properties of lateral-compartment cartilage, and (2) are osteophytes in the lateral compartment associated with particular histologic features of cartilage in the lateral compartment? METHODS: Between May 2010 and January 2012, we performed 201 TKAs for varus osteoarthritis confirmed on standardized AP hip-to-ankle standing radiographs...
November 9, 2016: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/27816389/biomechanical-optimization-of-the-angle-and-position-for-surgical-implantation-of-a-straight-short-stem-hip-implant
#17
Gillian E Cook, Saeid Samiezadeh, Zachary Morison, Mina S R Aziz, Habiba Bougherara, Radovan Zdero, Emil H Schemitsch
Conservative hip implants preserve healthy bone for revision surgeries and improve physiological loading; however, they have little supporting biomechanical data with respect to their 3D orientation during implantation. This study endeavored to determine the optimal 3D orientation of a straight short stem hip implant within the proximal femur that would yield a stress distribution most similar to an intact femur. Synthetic femurs were implanted with a stem in one of seven maximum angles or positions and axially loaded, with resultant strain values used to validate a finite element model...
November 2, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27799670/correlation-between-hip-function-and-knee-kinematics-evaluated-by-three-dimensional-motion-analysis-during-lateral-and-medial-side-hopping
#18
Hiromitsu Itoh, Kohei Takiguchi, Yohei Shibata, Satoshi Okubo, Shinichi Yoshiya, Ryosuke Kuroda
[Purpose] Kinematic and kinetic characteristics of the limb during side-hopping and hip/knee interaction during this motion have not been clarified. The purposes of this study were to examine the biomechanical parameters of the knee during side hop and analyze its relationship with clinical measurements of hip function. [Subjects and Methods] Eleven male college rugby players were included. A three-dimensional motion analysis system was used to assess motion characteristics of the knee during side hop. In addition, hip range of motion and muscle strength were evaluated...
September 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27789875/biomechanical-analysis-of-the-cephalomedullary-nail-versus-the-trochanteric-stabilizing-plate-for-unstable-intertrochanteric-femur-fractures
#19
David Walmsley, Bruce Nicayenzi, Paul Rt Kuzyk, Alan Machin, Habiba Bougherara, Emil H Schemitsch, Radovan Zdero
Unstable intertrochanteric fractures are commonly treated with a cephalomedullary nail due to high failure rates with a sliding hip screw. The Omega3 Trochanteric Stabilizing Plate is a relatively new device that functions like a modified sliding hip screw with a proximal extension; however, its mechanical properties have not been evaluated. This study biomechanically compared a cephalomedullary nail, that is, Gamma3 Nail against the Omega3 plate. Unstable intertrochanteric fractures were created in 24 artificial femurs...
October 26, 2016: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/27789034/soldier-relevant-body-borne-loads-increase-knee-joint-contact-force-during-a-run-to-stop-maneuver
#20
John W Ramsay, Clifford L Hancock, Meghan P O'Donovan, Tyler N Brown
The purpose of this study was to understand the effects of load carriage on human performance, specifically during a run-to-stop (RTS) task. Using OpenSim analysis tools, knee joint contact force, grounds reaction force, leg stiffness and lower extremity joint angles and moments were determined for nine male military personnel performing a RTS under three load configurations (light, ~6kg, medium, ~20kg, and heavy, ~40kg). Subject-based means for each biomechanical variable were submitted to repeated measures ANOVA to test the effects of load...
October 20, 2016: Journal of Biomechanics
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