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hip biomechanics

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https://www.readbyqxmd.com/read/28213865/location-of-vertebral-fractures-is-associated-with-bone-mineral-density-and-history-of-traumatic-injury
#1
Jennifer Watt, Richard Crilly
The upper and lower thoracolumbar spine have been associated with different biomechanical outcomes. This concept, as it applies to osteoporotic fracture risk, has not been well documented. This was a case-control study of 120 patients seen in an osteoporosis clinic. Vertebral fractures were identified from lateral radiographs using Genant's semi-quantitative assessment method. An association between bone mineral density (BMD) T-scores and vertebral fracture location was assessed. In an additional analysis, the association between a history of any traumatic injury and possible predictor variables was also explored...
February 17, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28209597/athletic-groin-pain-part-2-a-prospective-cohort-study-on-the-biomechanical-evaluation-of-change-of-direction-identifies-three-clusters-of-movement-patterns
#2
A Franklyn-Miller, C Richter, E King, S Gore, K Moran, S Strike, E C Falvey
BACKGROUND: Athletic groin pain (AGP) is prevalent in sports involving repeated accelerations, decelerations, kicking and change-of-direction movements. Clinical and radiological examinations lack the ability to assess pathomechanics of AGP, but three-dimensional biomechanical movement analysis may be an important innovation. AIM: The primary aim was to describe and analyse movements used by patients with AGP during a maximum effort change-of-direction task. The secondary aim was to determine if specific anatomical diagnoses were related to a distinct movement strategy...
March 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28209401/the-effect-of-prophylactic-cerclage-wires-in-primary-total-hip-arthroplasty-a-biomechanical-study
#3
Andrew C Waligora, John R Owen, Jennifer S Wayne, Shane R Hess, Gregory J Golladay, William A Jiranek
BACKGROUND: Despite literature to support the use of various cerclage techniques to address intraoperative femoral fractures in total hip arthroplasty, there are limited data to support prophylactic cerclage wiring of the femur during cementless implant placement. This study aims to evaluate the effect of prophylactic calcar cerclage wires on the biomechanical parameters required to produce periprosthetic femoral fractures and on the morphology of these fracture patterns in stable cementless femoral implants...
January 21, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28209345/multiobjective-optimization-of-cartilage-stress-for-non-invasive-patient-specific-recommendations-of-high-tibial-osteotomy-correction-angle-a-novel-method-to-investigate-alignment-correction
#4
Keke Zheng, Corey J Scholes, Junning Chen, David Parker, Qing Li
Medial opening wedge high tibial osteotomy (MOWHTO) is a surgical procedure to treat knee osteoarthritis associated with varus deformity. However, the ideal final alignment of the Hip-Knee-Ankle (HKA) angle in the frontal plane, that maximizes procedural success and post-operative knee function, remains controversial. Therefore, the purpose of this study was to introduce a subject-specific modeling procedure in determining the biomechanical effects of MOWHTO alignment on tibiofemoral cartilage stress distribution...
February 13, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28195975/the-high-bar-and-low-bar-back-squats-a-biomechanical-analysis
#5
Daniel J Glassbrook, Scott R Brown, Eric R Helms, J Scott Duncan, Adam G Storey
No prior study has compared the joint angle and ground reaction force (Fv) differences between the high-bar back-squat (HBBS) and low-bar back-squat (LBBS) above 90% 1RM. Six male powerlifters (height: 179.2 ± 7.8 cm; bodyweight: 87.1 ± 8.0 kg; age: 27.3 ± 4.2 years) of international level, six male Olympic weightlifters (height: 176.7 ± 7.7 cm; bodyweight: 83.1 ± 13 kg; age: 25.3 ± 3.1 years) of national level, and six recreationally trained male athletes (height: 181.9 ± 8.7 cm; bodyweight: 87.9 ± 15...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28195302/testing-biomechanical-models-of-human-lumbar-lordosis-variability
#6
Eric R Castillo, Connie Hsu, Ross W Mair, Daniel E Lieberman
OBJECTIVES: Lumbar lordosis (LL) is a key adaptation for bipedalism, but factors underlying curvature variations remain unclear. This study tests three biomechanical models to explain LL variability. MATERIALS AND METHODS: Thirty adults (15 male, 15 female) were scanned using magnetic resonance imaging (MRI), a standing posture analysis was conducted, and lumbar range of motion (ROM) was assessed. Three measures of LL were compared. The trunk's center of mass was estimated from external markers to calculate hip moments (Mhip ) and lumbar flexion moments...
February 13, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28188484/estimation-of-attachment-regions-of-hip-muscles-in-ct-image-using-muscle-attachment-probabilistic-atlas-constructed-from-measurements-in-eight-cadavers
#7
Norio Fukuda, Yoshito Otake, Masaki Takao, Futoshi Yokota, Takeshi Ogawa, Keisuke Uemura, Ryota Nakaya, Kazunori Tamura, Robert B Grupp, Amirhossein Farvardin, Mehran Armand, Nobuhiko Sugano, Yoshinobu Sato
PURPOSE: Patient-specific musculoskeletal biomechanical simulation is useful in preoperative surgical planning and postoperative assessment in orthopedic surgery and rehabilitation medicine. A difficulty in application of the patient-specific musculoskeletal modeling comes from the fact that the muscle attachment regions are typically invisible in CT and MRI. Our purpose is to develop a method for estimating patient-specific muscle attachment regions from 3D medical images and to validate with cadaver experiments...
February 10, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28186871/augmentation-of-proximal-femoral-nail-in-unstable-trochanteric-fractures
#8
Wasudeo M Gadegone, Bhaskaran Shivashankar, Vijayanad Lokhande, Yogesh Salphale
INTRODUCTION: Biomechanically proximal femoral nail (PFN) is a better choice of implant, still it is associated with screw breakage, cut out of screw through femoral head, Z effect, reverse Z effect, and lateral migration of screws. The purpose of this study is to evaluate the results of augmented PFN in terms of prevention of postoperative complications and failure rates in unstable trochanteric fractures. MATERIAL AND METHODS: We carried out a prospective study of 82 cases with unstable trochanteric femoral fractures from April 2010 to December 2015...
2017: SICOT-J
https://www.readbyqxmd.com/read/28173788/real-time-optimized-biofeedback-utilizing-sport-techniques-robust-a-study-protocol-for-a-randomized-controlled-trial
#9
Jeffrey B Taylor, Anh-Dung Nguyen, Mark V Paterno, Bin Huang, Kevin R Ford
BACKGROUND: Anterior cruciate ligament (ACL) injuries in female athletes lead to a variety of short- and long-term physical, financial, and psychosocial ramifications. While dedicated injury prevention training programs have shown promise, ACL injury rates remain high as implementation has not become widespread. Conventional prevention programs use a combination of resistance, plyometric, balance and agility training to improve high-risk biomechanics and reduce the risk of injury. While many of these programs focus on reducing knee abduction load and posture during dynamic activity, targeting hip extensor strength and utilization may be more efficacious, as it is theorized to be an underlying mechanism of injury in adolescent female athletes...
February 7, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28168080/the-femoral-neck-mechanoresponse-to-hip-extensors-exercise-a-case-study
#10
Saulo Martelli, Hossein Mokhtarzadeh, Peter Pivonka, Peter R Ebeling
Physical activity is recommended to prevent age-related bone loss. However, the proximal femur mechanoresponse is variable, possibly because of a muscle-dependant mechanoresponse. We compared the proximal femur response with the femoral strain pattern generated by the hip extensor muscles. A healthy participant underwent a six-month unilateral training of the hip extensor muscles using a resistance weight regularly adjusted to the 80% of the one-repetition maximum weight. DXA-based measurements of the areal Bone Mineral Density (aBMD) in the exercise leg were adjusted for changes in the control leg...
2017: Journal of Osteoporosis
https://www.readbyqxmd.com/read/28165599/cementing-a-polyethylene-cup-into-a-well-fixed-acetabular-metal-on-metal-resurfacing-component-an-experimental-investigation
#11
Matthias C M Klotz, Sebastian Jäger, Philippe Kretzer, Nicholas A Beckmann, Marc Thomsen, Rudi G Bitsch
INTRODUCTION: Adverse reactions to metal debris often indicate revision surgery in metal-on-metal (MoM) hip arthroplasty and an exchange of the MoM bearing into either a metal on polyethylene or a ceramic-on-polyethylene articulation. At the moment the removal of the entire implant system is the most reasonable method. In order to avoid bone loss caused by the removal of a well-fixed acetabular component, the purpose of this study was to measure the stability of a cemented polyethylene (PE) cup in an acetabular hip resurfacing component and to examine if such a method could be suitable for clinical use...
February 3, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28164052/treatment-of-stiff-elbow-in-young-patients-with-interpositional-arthroplasty-for-mobility-case-series
#12
R Sivakumar, V SomaSheker, Prahalad Kumar Shingi, T Vinoth, M Chidambaram
INTRODUCTION: The elbow is a complex joint involving many articulations and complex biomechanics come into play. Elbow motion is crucial to upper limb movement that loss of 50% of elbow function equals to loss of 80% of upper extremity global function. Restoring movement and stability is challenging to the surgeon while treating a stiff elbow. Unlike other arthroplasties of hip and knee, total elbow arthroplasty (TEA) may not be a primary treatment. Interpositional arthroplasty (IPA) can be considered a viable option in posttraumatic arthritis of elbow in young patients...
September 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28161898/the-relationship-between-loading-history-and-proximal-femoral-diaphysis-cross-sectional-geometry
#13
Sirpa Niinimäki, Nathaniel Narra, Laura Härkönen, Shinya Abe, Riku Nikander, Jari Hyttinen, Christopher Knüsel, Harri Sievänen
OBJECTIVES: We investigated the relationship between loading history and bone biomechanical properties used in physical activity reconstructions. These bone properties included bone bending and torsional strength (J), cortical area (CA), the direction of the major axis (theta angle), and element shape ratios determined from cross sections of standardized bone length. In addition, we explored the applicability of anatomically determined cross sections. METHODS: Our material consisted of hip and proximal thigh magnetic resonance images of Finnish female athletes (N = 91) engaged in high-jump, triple-jump, endurance running, swimming, power-lifting, soccer and squash; along with a group of active non-athlete individuals (N = 20)...
February 5, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28160929/editorial-commentary-anatomical-vandalism-of-the-hip-hip-capsular-repair-seems-a-sound-adjunct-to-hip-arthroscopic-surgery
#14
EDITORIAL
Richard J van Arkel, Jonathan R T Jeffers, Andrew A Amis
The study "Contribution of the Pubofemoral Ligament to Hip Stability: A Biomechanical Study" by Martin, Khoury, Schröder, Johnson, Gómez-Hoyos, Campos, and Palmer found that cutting the hip capsular ligament allowed a large increase in femoral internal rotation, particularly in the flexed hip, causing subluxation to occur. In addition to providing new data on the role of the pubofemoral ligament, it raises the question of whether hip joint surgeons should repair the capsule-what are the likely consequences?-and whether any beneficial effects persist in long-term clinical follow-ups...
February 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28159679/is-there-a-role-for-femoral-offset-restoration-during-total-hip-arthroplasty-a-systematic-review
#15
REVIEW
Marcello De Fine, Matteo Romagnoli, Angelo Toscano, Alice Bondi, Matteo Nanni, Stefano Zaffagnini
BACKGROUND: Benefits of femoral offset restoration during total hip arthroplasty should be the reduction of bearing surfaces wear, implant loosening and dislocation rates. Modular neck stems ensure offset customization, but fretting corrosion and catastrophic failures are well documented complications. Since clinical evidences are needed to substantiate the effectiveness of femoral offset restoration and promote modular neck choice, we systematically reviewed the literature to ascertain whether femoral offsetitself has a proven clinical influence: 1) on bearing surfaces wear, 2) implant loosening, 3) and dislocation rates...
January 31, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28157077/altered-hip-mechanics-and-patellofemoral-pain-a-review-of-literature
#16
Gholamhassan Mirzaie, Mehrnaz Kajbafvala, Abbas Rahimi, Farideh Dehghan Manshadi, Khosro Khademi Kalantari
Patellofemoral pain (PFP) is a common knee disorder in orthopedic clinics. In the last decade, several investigations have considered the role of proximal factors in addition to local and distal factors in development of PFP. There is a hypothesis which suggests that impaired neuromuscular control and altered hip joint kinematic affect tibiofemoral and patellofemoral biomechanics. Hence, PFP may develop as a result. This article reviews studies assessing the relationship between altered hip mechanics and PFP...
May 5, 2016: Ortopedia, Traumatologia, Rehabilitacja
https://www.readbyqxmd.com/read/28155591/impact-of-an-implanted-neuroprosthesis-on-community-ambulation-in-incomplete-sci
#17
Lisa M Lombardo, Rudolf Kobetic, Gilles Pinault, Kevin M Foglyano, Stephanie N Bailey, Stephen Selkirk, Ronald J Triolo
OBJECTIVE: Test the effect of a multi-joint control with implanted electrical stimulation on walking after spinal cord injury (SCI). DESIGN: Single subject research design with repeated measures Setting: Hospital-based biomechanics laboratory and user assessment of community use. PARTICIPANTS: Female with C6 AIS C SCI 30 years post injury. INTERVENTIONS: Lower extremity muscle activation with an implanted pulse generator and gait training...
February 3, 2017: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/28149408/maximal-power-of-the-lower-limbs-of-youth-gymnasts-and-biomechanical-indicators-of-the-forward-handspring-vault-versus-the-sports-result
#18
Andrzej Kochanowicz, Kazimierz Kochanowicz, Bartłomiej Niespodziúski, Jan Mieszkowski, Piotr Aschenbrenner, Grzegorz Bielec, Mirosława Szark-Eckardt
The aim of the study was to define the relationship between maximal power of lower limbs, the biomechanics of the forward handspring vault and the score received during a gymnastics competition. The research involved 42 gymnasts aged 9-11 years competing in the Poland's Junior Championships. The study consisted of three stages: first -estimating the level of indicators of maximal power of lower limbs tested on a force plate during the countermovement jump; second - estimating the level of biomechanical indicators of the front handspring vault...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28139193/effects-of-nsaids-and-hydroxyapatite-coating-on-osseointegration
#19
Ahmet Salduz, Fatih Dikici, Önder Ismet Kılıçoğlu, Halil Ibrahim Balcı, Turgut Akgul, Mehmet Kürkçü, Cem Kurtoğlu, Remzi Tözün
PURPOSE: The aim of our study is to investigate the bone ongrowth of two different alternative surfaces and the effect of nonsteroidal anti-inflammatory drugs (NSAIDs) on osseointegration. METHODS: Hips of 40 New Zealand white rabbits were operated bilaterally. Hydroxyapatite (HA)-coated titanium rods were implanted into the right femur, and grit-blasted titanium rods were implanted into the left femur. They were divided into three groups. At the end of 8 weeks, both femora of the rabbits were removed and investigated biomechanically and histologically...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28135662/trunk-and-lower-limb-biomechanics-during-stair-climbing-in-people-with-and-without-symptomatic-femoroacetabular-impingement
#20
Connor A Hammond, Gillian L Hatfield, Michael K Gilbart, S Jayne Garland, Michael A Hunt
BACKGROUND: Femoroacetabular impingement is a pathomechanical hip condition leading to pain and impaired physical function. It has been shown that those with femoroacetabular impingement exhibit altered gait characteristics during level walking and stair climbing, and decreased muscle force production during isometric muscle contractions. However, no studies to-date have looked at trunk kinematics or muscle activation during dynamic movements such as stair climbing in this patient population...
February 2017: Clinical Biomechanics
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