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https://www.readbyqxmd.com/read/28318604/comparison-of-whole-body-vertical-stiffness-and-leg-stiffness-during-single-leg-hopping-in-place-in-children-and-adults
#1
Matthew Beerse, Jianhua Wu
In the hopping literature, whole-body vertical stiffness and leg stiffness are used interchangeably, due to most of the movement occurring in the vertical direction. However, there is some anterior/posterior movement of the center of mass and displacements of the foot during hopping in place in both children and adults. Further it is not understood if leg stiffness show a similar pattern as whole-body vertical stiffness when increasing hopping frequency. The purpose of this study was to test if whole-body vertical stiffness and leg stiffness are different during single-leg hopping in-place in children and adults, across a range of frequencies...
March 9, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28314214/gait-biomechanics-following-lower-extremity-trauma-amputation-vs-reconstruction
#2
Elizabeth Russell Esposito, Daniel J Stinner, John R Fergason, Jason M Wilken
BACKGROUND: Surgical advances have substantially improved outcomes for individuals sustaining traumatic lower extremity injury. Injuries once requiring lower limb amputation are now routinely managed with limb reconstruction surgery. However, comparisons of functional outcomes between the procedures are inconclusive. PURPOSE: To compare gait biomechanics after lower limb reconstruction and transtibial amputation. METHODS: Twenty-four individuals with unilateral lower limb reconstruction wearing a custom ankle-foot orthosis (Intrepid Dynamic Exoskeletal Orthosis), 24 with unilateral, transtibial amputation, and 24 able-bodied control subjects underwent gait analysis at a standardized Froude speed based on leg length...
February 21, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28297187/pelvic-rotation-effect-on-human-stride-length-releasing-the-constraint-of-obstetric-selection
#3
Katherine K Whitcome, E Elizabeth Miller, Jessica L Burns
As human walking speed increases, pelvic step accounts for a greater percentage of total step length and is associated with an increase in amplitude of pelvic rotation. As a result, for any given speed individuals of varied pelvic width and leg length should differ in locomotor kinematics and energetic cost. Yet despite absolutely shorter legs and wider pelves relative to leg length in females, mass-specific cost of transport in walking does not differ by sex. Focusing on stride length as the major component of gait economy, we perform a quantitative analysis of temporal, spatial and rotational gait parameters using kinematic measurements obtained from 30 healthy adults walking at two comfortable speeds...
April 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28295122/epiphysiodesis-screw-bending
#4
Brett M Normandin, David J Tennent, Todd H Baldini, Alesia M Blanchard, Jason T Rhodes
Percutaneous epiphysiodesis using transphyseal screws is a common method for treatment of limb length discrepancy and angular deformity. The authors report 3 cases of a previously unreported complication following treatment with percutaneous epiphysiodesis using transphyseal screws: bending of the transphyseal screw. In each case, this rare complication was associated with difficult removal of the screw. This retrospective case report accessed the medical records of 3 children, 2 boys and 1 girl, 9 to 14 years old...
March 14, 2017: Orthopedics
https://www.readbyqxmd.com/read/28268761/combined-gait-asymmetry-metric
#5
Tyagi Ramakrishnan, Haris Muratagic, Kyle B Reed
People with physical impairments often have asymmetric gait. To evaluate if their overall symmetry is improving during intervention, there needs to be a simple metric that can help classify gait patterns that includes multiple measures of gait asymmetry. The Combined Gait Asymmetry Metric presented here is based on the Mahalanobis distance of multiple step parameters. We tested able-bodied subjects with perturbations that involve a change in leg length, the addition of ankle weights, and a combination of both perturbations...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28263807/acetate-templating-on-calibrated-standing-digital-radiograph-improves-accuracy-of-preoperative-templating-for-total-hip-arthroplasty
#6
Q Wang, J Xiao, L Zhu, X Zhao, Z Liu, J Wang, Y Qin
BACKGROUND: The accuracy of preoperative templating with respect to leg length, femoral offset, and the size of femoral and acetabular components is essential to the success of total hip arthroplasty (THA). Traditionally, templating has been performed using printed film with acetate templates. However, preoperative templating designed by different prosthetic manufacturers cannot be used directly on the film due to varying acetate template amplification ratios. Computer-based templating needs specialized digital templating software, which has cost implications...
March 2, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28261428/association-between-sacral-slanting-and-adjacent-structures-in-patients-with-adolescent-idiopathic-scoliosis
#7
Jae Hwan Cho, Choon Sung Lee, Youn-Suk Joo, Jungu Park, Chang Ju Hwang, Dong-Ho Lee
BACKGROUND: Sacral slanting is a frequent unique phenomenon in patients with adolescent idiopathic scoliosis (AIS) and may be important for selecting the distal fusion level. However, the reason of the phenomenon remains unknown. The purpose of this study was to determine the association between sacral slanting and adjacent structures in patients with AIS. METHODS: A total of 303 AIS patients who underwent both whole spine standing anteroposterior (AP) and whole leg standing AP radiography were included...
March 2017: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/28261423/cementless-total-hip-arthroplasty-involving-trochanteric-osteotomy-without-subtrochanteric-shortening-for-high-hip-dislocation
#8
Soong Joon Lee, Jeong Joon Yoo, Hee Joong Kim
BACKGROUND: Total hip arthroplasty with subtrochanteric shortening osteotomy is widely performed for high hip dislocation. However, suboptimal leg length discrepancy correction and nonunion of the osteotomy site remain concerns. Although total hip arthroplasty using trochanteric osteotomy without subtrochanteric osteotomy was introduced, cemented implants have been more commonly used than contemporary cementless implants in this procedure. We evaluated the long-term results of cementless total hip arthroplasty with trochanteric osteotomy without subtrochanteric osteotomy for high hip dislocation...
March 2017: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/28249982/staged-lengthening-and-reconstruction-for-children-with-a-leg-length-discrepancy-after-excision-of-an-osteosarcoma-around-the-knee
#9
S Kang, J S Lee, J Park, S-S Park
AIMS: Children treated for osteosarcoma around the knee often have a substantial leg-length discrepancy at skeletal maturity. The aim of this study was to investigate the results of staged skeletal reconstruction after a leg lengthening procedure using an external fixator in these patients. PATIENTS AND METHODS: We reviewed 11 patients who underwent staged reconstruction with either an arthroplasty (n = 6) or an arthrodesis (n = 5). A control group of 11 patients who had undergone wide excision and concurrent reconstruction with an arthroplasty were matched for gender, location, and size of tumour...
March 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28247211/data-set-of-healthy-old-people-assessed-for-three-walking-conditions-using-accelerometric-and-opto-electronic-methods
#10
S Gillain, M Boutaayamou, N Dardenne, C Schwartz, M Demonceau, C Gerontitis, F Depierreux, E Salmon, G Garraux, O Bruyère, O Brüls, J-L Croisier, J Petermans
BACKGROUND: Gait patterns of healthy aging are needed to allow a comparison with pathological situations. However, little data is available. OBJECTIVE: To present gait pattern of healthy older specially selected to be "healthy walkers". METHOD: Fifty-seven older people benefited from a geriatric assessment including clinical and functional evaluations to include only those without gait disorders. Gait data were simultaneously recorded using a tri-axial accelerometer placed on the waist and four 3D position markers placed on the feet at the level of the heel and the toe...
February 28, 2017: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/28242358/staged-protocol-for-the-treatment-of-chronic-femoral-shaft-osteomyelitis-with-ilizarov-s-technique-followed-by-the-use-of-intramedullary-locked-nail
#11
Po-Hsin Chou, Hsi-Hsien Lin, Yu-Pin Su, Chao-Ching Chiang, Ming-Chau Chang, Chuan-Mu Chen
BACKGROUND: Infected nonunion of the femoral shaft is uncommon, and usually presents with challenging therapeutic and reconstructive problems. There are still controversies over treating infected nonunion of the femoral shaft. The purposes of this retrospective study were to review the treatment outcomes and describe a staged protocol for spontaneous wound healing. METHODS: Six patients with chronic femoral shaft infected-nonunion from October 2002 to September 2010 were included in this retrospective study...
February 24, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/28228049/equation-based-precise-prediction-of-length-of-hamstring-tendons-and-quadrupled-graft-diameter-by-various-anthropometric-variables-for-knee-ligament-reconstruction-in-indian-population
#12
Ravi Gupta, Anubhav Malhotra, Gladson David Masih, Tanu Khanna
Preoperative prediction of hamstring tendon lengths and graft diameter for anterior cruciate ligament (ACL) reconstruction enables better preoperative planning. Presently, no study exists for Indian population where both derivation and verification of a mathematical equation for accurate prediction of hamstring graft dimensions have been done. This study was conducted in two phases: First phase ( derivation cohort): devoted to the study of correlation of length of hamstring tendons and graft diameter with various anthropometric measurements in 123 patients undergoing ACL reconstruction...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28226949/combined-gait-asymmetry-metric
#13
Tyagi Ramakrishnan, Haris Muratagic, Kyle B Reed, Tyagi Ramakrishnan, Haris Muratagic, Kyle B Reed, Kyle B Reed, Tyagi Ramakrishnan, Haris Muratagic
People with physical impairments often have asymmetric gait. To evaluate if their overall symmetry is improving during intervention, there needs to be a simple metric that can help classify gait patterns that includes multiple measures of gait asymmetry. The Combined Gait Asymmetry Metric presented here is based on the Mahalanobis distance of multiple step parameters. We tested able-bodied subjects with perturbations that involve a change in leg length, the addition of ankle weights, and a combination of both perturbations...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28222212/excellent-mid-term-results-of-a-new-polished-tapered-modular-cemented-stem-a-study-of-113-hip-replacements-with-minimum-5-year-follow-up
#14
Jens Vanbiervliet, Jan F A Somers
BACKGROUND: This prospective cohort study reports the medium-term clinical and radiographic results of 113 hips treated with a hybrid total hip replacement (THR) with a new cemented tapered cobalt-chrome (Co-Cr) stem with a titanium (Ti) modular neck (ProfemurXm®). METHOD: Between October 2008 and December 2010 we performed 115 consecutive hybrid THR with the ProfemurXm® in 105 patients. RESULTS: Survivorship of the implant (stem and modular neck) at a mean of 6...
February 18, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28222211/the-learning-curve-for-the-direct-anterior-approach-for-total-hip-arthroplasty-a-single-surgeon-s-first-500-cases
#15
James M Hartford, Michael J Bellino
BACKGROUND: Concerns arise over the early complications encountered during the learning curve for the direct anterior approach for total hip arthroplasty. PURPOSE: The purpose of this study is to examine the learning experience of a single surgeon in adapting this approach. METHODS: The 1st 500 primary total hip arthroplasties are reviewed. The patients were evaluated out to 3 months. Rates of major complications, reoperations, periprosthetic fractures, heterotopic ossification, leg length discrepancies and lateral femoral cutaneous nerve deficits were identified for each of 100 patients...
February 17, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28220260/three-stage-treatment-protocol-for-recalcitrant-distal-femoral-nonunion
#16
Ching-Hou Ma, Yen-Chun Chiu, Yuan-Kun Tu, Cheng-Yo Yen, Chin-Hsien Wu
INTRODUCTION: In this study, we proposed a three-stage treatment protocol for recalcitrant distal femoral nonunion and aimed to analyze the clinical results. MATERIALS AND METHODS: We retrospective reviewed 12 consecutive patients with recalcitrant distal femoral nonunion undergoing our three-stage treatment protocol from January 2010 to December 2014 in our institute. The three-stage treatment protocol comprised debridement of the nonunion site, lengthening to eliminate leg length discrepancy, deformity correction, stabilization with a locked plate, filling of the defect with cement spacer for inducing membrane formation, and bone reconstruction using a cancellous bone autograft (Masquelet technique) or free vascularized fibular bone graft...
February 20, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28188335/posterior-cruciate-ligament-reconstruction-in-skeletal-immature-children
#17
Ole Gade Sørensen, Peter Faunø, Svend Erik Christiansen, Martin Lind
PURPOSE: Rupture of the posterior cruciate ligament (PCL) is a rare knee injury in children with open growth plates. The follow-up results of six patients with open physes treated with PCL reconstruction are presented. The objective is to evaluate the clinical outcomes of PCL reconstruction for six skeletally immature patients. METHODS: Between 2006 and 2010, six skeletally immature patients were treated with PCL reconstruction. At the time of surgery, the median age was 9 years (range 6-14)...
February 10, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28159052/complex-ankle-arthrodesis-with-step-cut-osteotomy-in-charcot-arthropathy-with-bone-loss
#18
Sean Booth, Moez Ballal, Anand Pillai
We report a case of a complex limb salvage ankle arthrodesis in a patient with Charcot arthropathy. A step-cut osteotomy was performed in order to tackle the issues of anterior tibial bone loss; worsening leg length discrepancy; soft tissue contraction; joint instability and high risk of non-union. The construct formed by the step-cut allowed for the preservation of good bone stock; avoidance of further limb shortening; increased torsional stability and increased surface area for bony union. This resulted in a patient with a stable, plantigrade foot appropriate for footwear...
March 2017: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28157918/influence-of-axial-force-errors-on-the-deformation-of-the-4%C3%A2-%C3%A2-m-lightweight-mirror-and-its-correction
#19
Bin Lan, Xiaoxia Wu, Jianfeng Li, Ming Ming, Xiangyi Liu, Hongbo Yang
The lightweight primary mirror of the four meter Chinese telescope is supported axially by a passive hydraulic system, in parallel with an active system. The figure is sensitive to the errors in the axial forces, which can be effectively corrected using active optics. The squared RMS of this figure approximately follows the χ<sup>2</sup> distribution, as verified by Monte Carlo analysis. The probability distributions of the squared norm of the active-forces vector, of the squared norm of the leg-lengths vector in the hexapod platform, and of the squared RMS of the residual figure are discussed in terms of the bending modes obtained by singular-value decomposition of the influence matrix, the optical sensitivity matrix deduced through ray trace, and the Jacobian matrix of the hexapod platform...
January 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28152452/upper-extremity-motion-during-gait-in-adolescents-with-structural-leg-length-discrepancy-an-exploratory-study
#20
Fabiola Angelico, Marie Freslier, Jacqueline Romkes, Reinald Brunner, Stefan Schmid
BACKGROUND AND PURPOSE: Depending on the extent of a structural leg length discrepancy (LLD), several compensatory mechanisms take place in order to maintain function and to optimize energy consumption during gait. However, studies describing the influence of a structural LLD on upper limb motion are lacking. The current study therefore aimed at the evaluation of upper limb motion during gait in LLD patients compared to healthy controls. METHODS: Motion capture data from 14 patients with structural LLD and 15 healthy controls that were collected during barefoot walking at a self-selected speed were retrospectively analyzed...
January 4, 2017: Gait & Posture
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