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https://www.readbyqxmd.com/read/27902635/correlation-between-transverse-plan-kinematics-and-foot-progression-angle-in-children-with-spastic-diplegia
#1
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
#2
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
#3
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...
October 27, 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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
https://www.readbyqxmd.com/read/27490687/the-femoral-intercondylar-notch-during-life-an-anatomic-redefinition-with-patterns-predisposing-to-cruciate-ligament-impingement
#15
Lena Hirtler, Sebastian Röhrich, Franz Kainberger
OBJECTIVE: The goals of this study were to test whether age- and sex-dependent variations in the size and shape of the intercondylar notch exist and to define the landmarks and measurements best suited for assessment of the intercondylar notch on MR images. MATERIALS AND METHODS: In this retrospective cross-sectional study, 329 patients were divided into six age groups, and their MR images (3-T coronal T2-weighted fat-suppressed spectral attenuated inversion recovery [SPAIR], sagittal proton density-weighted, axial T2-weighted fat-suppressed SPAIR) were evaluated...
August 4, 2016: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/27475618/femoral-derotation-osteotomy-in-adults-with-cerebral-palsy
#16
C Putz, S I Wolf, A Geisbüsch, M Niklasch, L Döderlein, T Dreher
BACKGROUND: Internal rotation gait constitutes a complex gait disorder in bilateral spastic cerebral palsy (BSCP) including static torsional and dynamic components resulting in lever arm dysfunction. Although femoral derotation osteotomy (FDO) is a standard procedure to correct increased femoral anteversion in children, unpredictable outcome has been reported. The effect of FDO when it is done as part of single-event multilevel surgery (SEMLS) in adulthood has not been investigated. METHODS: In this study mid-term data of 63 adults with BSCP and internal rotation gait, undergoing SEMLS including FDO were analyzed pre- and 1...
September 2016: Gait & Posture
https://www.readbyqxmd.com/read/27450671/biomechanical-changes-associated-with-femoral-derotational-osteotomy
#17
Bruce A MacWilliams, Mark L McMulkin, Roy B Davis, David E Westberry, Glen O Baird, Peter M Stevens
Torsional deformities of the femur in children may occur as a result of either idiopathic or neuromuscular disorders and may be corrected with derotational osteotomies. Regardless of the underlying etiology, neither the effects of the torsional pathologies nor the alterations resulting from corrective osteotomies are well understood. A study of children with isolated femoral anteversion undergoing a single corrective procedure may assist in understanding the biomechanics of the pathology and the efficacy of surgical correction...
September 2016: Gait & Posture
https://www.readbyqxmd.com/read/27439728/complex-angular-and-torsional-deformities-distal-femoral-malunions-preoperative-planning-using-stereolithography-and-surgical-correction-with-locking-plate-fixation-in-four-dogs
#18
Michael D DeTora, Randy J Boudrieau
OBJECTIVE: To describe the surgical technique of complex distal femoral deformity correction with the aid of stereolithography apparatus (SLA) biomodels, stabilized with locking plate fixation. METHODS: Full-size replica epoxy bone biomodels of the affected femurs (4 dogs/ 5 limbs) were used as templates for surgical planning. A rehearsal procedure was performed on the biomodels aided by a guide wire technique and stabilized with locking plate fixation. Surgery performed in all dogs was guided by the rehearsal procedure...
September 20, 2016: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/27395450/three-dimensional-evaluation-of-skeletal-deformities-of-the-pelvis-and-lower-limbs-in-ambulant-children-with-cerebral-palsy
#19
Abir Massaad, Ayman Assi, Ziad Bakouny, Christophe Sauret, Nour Khalil, Wafa Skalli, Ismat Ghanem
Skeletal abnormalities, affecting posture and walking pattern, increase with motor impairment in children with cerebral palsy (CP). However, it is not known whether these skeletal malalignments occur in children with slight motor impairment. Our aim was to evaluate skeletal malalignment at the level of the pelvis and lower limbs in ambulant children with CP, with slight motor impairment, using a low dose biplanar X-ray technique. Twenty-seven children with spastic CP (mean age: 10.9±4years, 7 Hemiplegia, 20 Diplegia, GMFCS levels I:17, II:10), with no previous treatments at the hips and knees, underwent EOS(®) biplanar X-rays...
September 2016: Gait & Posture
https://www.readbyqxmd.com/read/27387718/biomechanical-evaluation-of-adjunctive-cerclage-wire-fixation-for-the-prevention-of-periprosthetic-femur-fractures-using-cementless-press-fit-total-hip-replacement
#20
Scott A Christopher, Stanley E Kim, Simon Roe, Antonio Pozzi
Periprosthetic femoral fractures are a common complication associated with cementless press-fit total hip arthroplasty. The use of prophylactic cerclage wire fixation has been advocated to reduce this complication. The objective of this study was to evaluate whether a double loop cerclage wire, used as adjunctive fixation, increased the peak torsional load to failure in femora implanted with press-fit cementless stems. Peak torsional load to failure was compared between femora without adjunctive fixation and femora receiving a 1 mm double loop cerclage wire placed proximally to the lesser trochanter...
August 2016: Veterinary Journal
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