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https://www.readbyqxmd.com/read/28066739/hip-instability-a-review-of-hip-dysplasia-and-other-contributing-factors
#1
REVIEW
Matthew J Kraeutler, Tigran Garabekyan, Cecilia Pascual-Garrido, Omer Mei-Dan
BACKGROUND: Hip instability has classically been associated with developmental dysplasia of the hip (DDH) in newborns and children. However, numerous factors may contribute to hip instability in children, adolescents, and adults. PURPOSE: This review aims to concisely present the literature on hip instability in patients of all ages in order to guide health care professionals in the appropriate diagnosis and treatment of the various disorders which may contribute to an unstable hip...
July 2016: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/28053382/a-novel-adjustable-dynamic-plate-for-treatment-of-long-bone-fractures-an-in-vitro-biomechanical-study
#2
Ahmet Karakasli, Nihat Acar, Ahmet Karaarslan, Fatih Ertem, Hasan Havitcioglu
INTRODUCTION: Locking compression plate (LCP) system was designed to provide bone stability and to enhance bone healing. However, implant failure, nonunion and instability are still frequently encountered complications. The purpose of this study was to assess and compare the biomechanical characteristics of a novel adjustable dynamic plate (ADP) with the commonly used LCP. MATERIALS AND METHODS: Twelve 4th generation composite artificial femoral bones were used...
October 2016: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/27984447/local-zinc-chloride-release-from-a-calcium-sulfate-carrier-enhances-fracture-healing
#3
Ethan S Krell, Joseph A Ippolito, Nicholas J Montemurro, Phillip H Lim, Richard A Vincent, Jeremy Hreha, Jessica Cottrell, Suleiman Y Sudah, Maximilian F Muñoz, Kristen P Pacific, Joseph Benevenia, J Patrick O'Connor, Sheldon S Lin
BACKGROUND: This study examined the efficacy of calcium sulfate (CaSO4) as a carrier for intramedullary delivery of zinc chloride (ZnCl2) to treat fracture healing in a BB Wistar rat model. A non-carrier mediated injection of 3.0 mg/kg ZnCl2 has previously been shown to enhance fracture healing. METHODS: A heterogeneous mixture of ZnCl2 and CaSO4 was administered into the intramedullary femoral canal and a mid-diaphyseal femur fracture was created unilaterally. Early and late parameters of fracture healing were assessed using biomechanical testing, radiographic scoring, quantitative histomorphometry (for percentage of new cartilage and bone within the fracture callus), and long term histological evaluation...
November 16, 2016: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/27940197/delivery-vehicle-effects-on-bone-regeneration-and-heterotopic-ossification-induced-by-high-dose-bmp-2
#4
Laxminarayanan Krishnan, Lauren B Priddy, Camden Esancy, Brett S Klosterhoff, Hazel Y Stevens, Lisa Tran, Robert E Guldberg
: Bone morphogenetic protein-2 (BMP-2), delivered on absorbable collagen sponge, is frequently used to treat bone defects. However, supraphysiological BMP-2 doses are common and often associated with complications such as heterotopic ossification and inflammation, causing pain and impaired mobility. This has prompted investigations into strategies to spatially control bone regeneration, for example growth factor delivery in appropriate scaffolds. Our objective was to investigate the spatiotemporal effects of high dose BMP-2 on bone regeneration as a function of the delivery vehicle...
December 8, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27935008/distal-femoral-lateral-closing-wedge-osteotomy-as-a-component-of-comprehensive-treatment-of-medial-patellar-luxation-and-distal-femoral-varus-in-dogs
#5
Barry E Brower, Michael P Kowaleski, Ann M Peruski, Antonio Pozzi, Jonathan Dyce, Kenneth A Johnson, Randy J Boudrieau
OBJECTIVE: To describe a cohort of dogs with medial patellar luxation managed with a distal femoral lateral closing wedge ostectomy (DFO) as a component of comprehensive treatment, and to report radiographic and long-term clinical outcome of this technique. METHODS: Medical records of dogs that had a lateral closing wedge DFO as part of management of medial patellar luxation at three veterinary teaching hospitals were reviewed. Surgical reports as well as the preoperative, postoperative, and follow-up radiographs were reviewed...
January 16, 2017: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/27935006/comparison-of-osteotomy-technique-and-jig-type-in-completion-of-distal-femoral-osteotomies-for-correction-of-medial-patellar-luxation-an-in-vitro-study
#6
Matteo Olimpo, Lisa A Piras, Bruno Peirone, Derek B Fox
OBJECTIVES: Femoral osteotomies are frequently completed to correct malalignment associated with patellar luxation. The objectives of this study were to compare the use of: 1) two different types of jig; and 2) different types of osteotomy in the realignment of canine femoral bone models which possessed various iterations of angular deformity. METHODS: Models of canine femora possessing distal varus, external torsion and a combination of varus and torsion underwent correction utilizing two alignment jigs (Slocum jig and Deformity Reduction Device) and either a closing wedge ostectomy (CWO) or an opening wedge osteotomy (OWO)...
January 16, 2017: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/27902635/correlation-between-transverse-plan-kinematics-and-foot-progression-angle-in-children-with-spastic-diplegia
#7
Ana Presedo, Anne-Laure Simon, Cindy Mallet, Brice Ilharreborde, Keyvan Mazda, Georges-François Pennecot
In diplegic patients, the orientation of foot progression depends on multiple factors. We investigated the relationship between foot progression alignment, hip and pelvic rotations during gait, femoral anteversion, and tibial torsion. Kinematic and clinical parameters were evaluated for 114 children who walked independently and had not undergone previous surgery. Causes of intoeing presented combined in 72% of cases. Internal foot progression correlated with internal hip rotation and showed an inverse correlation with tibial torsion...
November 29, 2016: Journal of Pediatric Orthopedics. Part B
https://www.readbyqxmd.com/read/27844117/are-advanced-three-dimensional-imaging-studies-always-needed-to-measure-the-coronal-knee-alignment-of-the-lower-extremity
#8
Jean Yves Lazennec, Quentin Chometon, Dominique Folinais, Christopher B Robbins, Aidin Eslam Pour
BACKGROUND: Coronal malalignment of the lower extremity is closely related to the onset and progression of osteoarthritis. Restoring satisfactory alignment after tibial osteotomy improves the long-term success of this conservative surgery. The purpose of our study was to determine (1) if there is a difference between two-dimensional (2D) and 3D measurements of the hip-knee-ankle (HKA) angle between the mechanical axes of the femur and the tibia, (2) which parameter most affects 2D-3D HKA measurement, and (3) the percentage of patients who are at risk of error in HKA measurement...
November 14, 2016: International Orthopaedics
https://www.readbyqxmd.com/read/27823803/full-field-measurement-of-micromotion-around-a-cementless-femoral-stem-using-micro-ct-imaging-and-radiopaque-markers
#9
V Malfroy Camine, H A Rüdiger, D P Pioletti, A Terrier
A good primary stability of cementless femoral stems is essential for the long-term success of total hip arthroplasty. Experimental measurement of implant micromotion with linear variable differential transformers is commonly used to assess implant primary stability in pre-clinical testing. But these measurements are often limited to a few distinct points at the interface. New techniques based on micro-computed tomography (micro-CT) have recently been introduced, such as Digital Volume Correlation (DVC) or markers-based approaches...
December 8, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27789875/biomechanical-analysis-of-the-cephalomedullary-nail-versus-the-trochanteric-stabilizing-plate-for-unstable-intertrochanteric-femur-fractures
#10
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/27735977/biomechanical-and-cost-comparisons-of-near-far-and-pin-bar-constructs
#11
Augusta Whitney Kluk, Tina Zhang, Joseph P Russell, Hyunchul Kim, Adam H Hsieh, Robert V O'Toole
Orthopedic dogma states that external fixator stiffness is improved by placing 1 pin close to the fracture and 1 as distant as possible ("near-far"). This fixator construct is thought to be less expensive than placing pins a shorter distance apart and using "pin-bar" clamps that attach pins to outriggers. The authors therefore hypothesized that the near-far construct is stiffer and less expensive. They compared mechanical stiffness and costs of near-far and pin-bar constructs commonly used for temporary external fixation of femoral shaft fractures...
October 13, 2016: Orthopedics
https://www.readbyqxmd.com/read/27716955/computation-of-femoral-canine-morphometric-parameters-in-three-dimensional-geometrical-models
#12
Gianpaolo Savio, Teresa Baroni, Gianmaria Concheri, Ermenegildo Baroni, Roberto Meneghello, Federico Longo, Maurizio Isola
OBJECTIVE: To define and validate a method for the measurement of 3-dimensional (3D) morphometric parameters in polygonal mesh models of canine femora. STUDY DESIGN: Ex vivo/computerized model. SAMPLE POPULATION: Sixteen femora from 8 medium to large-breed canine cadavers (mean body weight 28.3 kg, mean age 5.3 years). METHODS: Femora were measured with a 3D scanner, obtaining 3D meshes. A computer-aided design-based (CAD) software tool was purposely developed, which allowed automatic calculation of morphometric parameters on a mesh model...
September 26, 2016: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/27597431/characterization-of-femoral-component-initial-stability-and-cortical-strain-in-a-reduced-stem-length-design
#13
Scott R Small, Sarah E Hensley, Paige L Cook, Rebecca A Stevens, Renee D Rogge, John B Meding, Michael E Berend
BACKGROUND: Short-stemmed femoral components facilitate reduced exposure surgical techniques while preserving native bone. A clinically successful stem should ideally reduce risk for stress shielding while maintaining adequate primary stability for biological fixation. We asked (1) how stem-length changes cortical strain distribution in the proximal femur in a fit-and-fill geometry and (2) if short-stemmed components exhibit primary stability on par with clinically successful designs...
August 10, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27578377/treatment-of-pediatric-femoral-shaft-fractures-by-stainless-steel-and-titanium-elastic-nail-system-a-randomized-comparative-trial
#14
Tank Gyaneshwar, Rustagi Nitesh, Tomar Sagar, Kothiyal Pranav, Nitesh Rustagi
PURPOSE: Literature suggests that the lower modulus of elasticity of titanium makes it ideal for use in children compared with stainless steel. Better fracture stability was observed in association with titanium nails on torsional and axial compression testing. However, stainless steel nails are stiffer than titanium counterparts, which may provide a rigid construct when fixing paediatric femoral shaft fractures. Complications have been observed more frequently by various researchers when titanium nails are used for fracture fixation in patients with increasing age or weight...
August 1, 2016: Chinese Journal of Traumatology, Zhonghua Chuang Shang za Zhi
https://www.readbyqxmd.com/read/27552464/biomechanical-consequences-of-anterior-femoral-notching-in-cruciate-retaining-versus-posterior-stabilized-total-knee-arthroplasty
#15
Rishabh Jethanandani, Mahbubul B Patwary, Adam D Shellito, John P Meehan, Derek F Amanatullah
Anterior femoral notching during total knee arthroplasty is a potential risk factor for periprosthetic supracondylar femur fracture. We conducted a study to determine if the design of the femoral implant changes the risk for periprosthetic supracondylar femur fractures after anterior cortical notching. An anterior cortical defect was created in 12 femoral polyurethane models. Six femora were instrumented with cruciate-retaining implants and 6 with posterior-stabilized implants. Each femur was loaded in external rotation along the anatomical axis...
July 2016: American Journal of Orthopedics
https://www.readbyqxmd.com/read/27543698/normal-age-related-changes-in-left-ventricular-function-role-of-afterload-and-subendocardial-dysfunction
#16
Jehill D Parikh, Kieren G Hollingsworth, Dorothy Wallace, Andrew M Blamire, Guy A MacGowan
BACKGROUND: In normal ageing, both vascular and ventricular properties change, and how these affect left ventricular function is not clear. METHODS: 96 subjects (ages 20-79) without cardiovascular disease underwent cardiac magnetic resonance (MR) imaging for measurement of global function, diastolic function (E/A ratio), MR tagging for measurement of torsion to shortening ratio (TSR, ratio of epicardial torsion to endocardial circumferential shortening, with increase in TSR suggesting subendocardial dysfunction relative to the subepicardium), and phase contrast MR imaging measurement of central aortic pulse wave velocity (PWV)...
November 15, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27531495/malrotation-deformities-of-the-lower-extremity-and-implications-on-total-knee-arthroplasty-a-narrative-review
#17
REVIEW
Geert Peersman, Kim Taeymans, Christophe Jans, Philippe Vuylsteke, Peter Fennema, Thomas Heyse
INTRODUCTION: Total knee arthroplasty (TKA) is a successful procedure for the management of osteoarthritis (OA) of the knee. Axial plane deformities are more common than suspected in patients presenting with osteoarthritis of the knee joint. Recent research has indicated that torsional deformities could play an important role in the development of anterior knee pain (AKP). METHODS: In a narrative review of the literature, the aetiology of maltorsion deformity of the lower extremity in both, childhood and adulthood, as well as the development of postoperative femoral axial plane deformities are examined...
November 2016: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/27513740/the-rotational-profile-a-study-of-lower-limb-axial-torsion-hip-rotation-and-the-foot-progression-angle-in-healthy-adults
#18
David Hudson
The purpose of this study was to compare the rotational profile of adults with higher versus lower foot progression angles (FPA). Tibial torsion, femoral torsion, hip internal and external rotation and FPA data were collected on one hundred two healthy volunteers. Data were stratified into Low, Mid, and High FPA groups to study relationships among the components of the rotational profile and if there were group differences in the magnitude of torsion angles. Direction of torsion was also studied as an attempt to look at the incidence of offsetting between the tibia and femur...
September 2016: Gait & Posture
https://www.readbyqxmd.com/read/27513720/determination-and-correlation-of-lower-limb-anatomical-parameters-and-bone-age-during-skeletal-growth-based-on-1005-cases
#19
Ádám Tibor Schlégl, Ian O'Sullivan, Péter Varga, Péter Than, Csaba Vermes
The aim of this study was to evaluate bone age and its correlation with the lower limbs' developing skeletal anatomy during growth. 1005 children and young adults were evaluated for bone age and 14 different parameters measured on lower-limb reconstructions from radiological examinations carried out with an EOS 2D/3D system in the course of routine orthopedic indicated diagnostic practice. Cervical vertebral morphology evaluation for bone age using the Hassel-Farman method, which describes 6 stages of maturity, was selected...
August 11, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27501703/significant-differences-in-femoral-torsion-values-depending-on-the-ct-measurement-technique
#20
Peter Kaiser, René Attal, Mark Kammerer, Michael Thauerer, Lea Hamberger, Raul Mayr, Werner Schmoelz
INTRODUCTION: This study compared the feasibility of six different CT-based measurement techniques for establishing an indication for derotational osteotomy in the cases of patellar instability or femoral fracture. MATERIALS AND METHODS: CT scans of 52 single human cadaver femora were measured using six different torsion measurement techniques (described by Waidelich, Murphy, and Yoshioka on transverse images and Hernandez, Jarrett, and Yoshioka on oblique images)...
September 2016: Archives of Orthopaedic and Trauma Surgery
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