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clinical biomechanics

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https://www.readbyqxmd.com/read/28229193/osseointegrated-prostheses-for-rehabilitation-following-amputation-the-pioneering-swedish-model
#1
Yan Li, Rickard Brånemark
The direct attachment of osseointegrated (OI) prostheses to the skeleton avoids the inherent problems of socket suspension. It also provides physiological weight bearing, improved range of motion in the proximal joint, as well as osseoperceptive sensory feedback, enabling better control of the artificial limbs by amputees. The present article briefly reviews the pioneering efforts on extremity osseointegration surgeries in Sweden and the development of the OPRA (Osseointegrated Prostheses for the Rehabilitation of Amputees) program...
February 22, 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/28228783/-atypical-atypical-femur-fractures-and-use-of-bisphosphonates
#2
Denise M van de Laarschot, Matthijs P Somford, Agnes Jager, Edwin H Oei, P Koen Bos, M Carola Zillikens
BACKGROUND: Atypical femur fractures (AFFs) present a rare but serious condition associated with use of bisphosphonates. Underlying mechanisms and clinical risk factors remain unclear. According to the diagnostic criteria formulated by the ASBMR, a lateral localization of an AFF is required. CASE HISTORY: We present a patient who developed bilateral leg pain while using an oral bisphosphonate and aromatase inhibitor in the course of adjuvant treatment for breast cancer...
September 2016: Clinical Cases in Mineral and Bone Metabolism
https://www.readbyqxmd.com/read/28227917/evaluation-of-shoulder-joint-kinematics-and-muscle-activity-during-geared-and-standard-manual-wheelchair-mobility
#3
Omid Jahanian, Alyssa J Schnorenberg, Brooke A Slavens, Omid Jahanian, Alyssa J Schnorenberg, Brooke A Slavens, Brooke A Slavens, Alyssa J Schnorenberg, Omid Jahanian
Manual wheelchairs often lead to reduced independent function and an increase in shoulder pain and injuries. Geared manual wheelchairs may be a promising alternative that reduces the biomechanical demands of the shoulder needed for tasks such as propulsion on ramps and carpeted floors, while maximizing function and participation. To investigate the effects of geared manual wheelchair mobility during demanding tasks such as ramp ascent, six able-bodied subjects were evaluated in this study. Subjects were asked to propel both standard and geared manual wheelchairs on a tiled level floor and on a wheelchair ADA ramp...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226974/design-of-an-intraoperative-peritoneal-lavage-device
#4
Maria Ignacia Aguilera, Esteban J Pino, Maria Ignacia Aguilera, Esteban J Pino, Maria Ignacia Aguilera, Esteban J Pino
This paper consists of the design and construction of an intraoperative peritoneal lavage device. It is intended for cleaning the intra-abdominal cavity during a surgical procedure, once the etiology of a peritonitis has been identified and treated. Its purpose is to improve the current standard treatment consisting of simple pouring saline solution. A good washing procedure aids stopping the inflammatory and infectious process generated after the contamination due to the perforation of a hollow viscera. COMSOL Multiphysics software was used to simulate the biomechanical behavior of the liver against localized pressure...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226584/leveraging-imu-data-for-accurate-exercise-performance-classification-and-musculoskeletal-injury-risk-screening
#5
Darragh Whelan, Martin O'Reilly, Bingquan Huang, Oonagh Giggins, Tahar Kechadi, Brian Caulfield, Darragh Whelan, Martin O'Reilly, Bingquan Huang, Oonagh Giggins, Tahar Kechadi, Brian Caulfield, Martin O'Reilly, Brian Caulfield, Oonagh Giggins, Tahar Kechadi, Darragh Whelan, Bingquan Huang
Inertial measurement units (IMUs) are becoming increasingly prevalent as a method for low cost and portable biomechanical analysis. However, to date they have not been accepted into routine clinical practice. This is often due to a disconnect between translating the data collected by the sensors into meaningful and actionable information for end users. This paper outlines the work completed by our group in attempting to achieve this. We discuss the conceptual framework involved in our work, the methodological approach taken in analysing sensor signals and discuss possible application models...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226218/assessing-cartilage-biomechanical-properties-techniques-for-evaluating-the-functional-performance-of-cartilage-in-health-and-disease
#6
Benjamin A Lakin, Brian D Snyder, Mark W Grinstaff
Osteoarthritis (OA) affects millions of people and results in weakened hyaline cartilage due to overloading. During joint articulation, hyaline cartilage must withstand high loads while maintaining low friction to prevent wear and tissue loss. Thus, cartilage compressive stiffness and the coefficient of friction are important indicators of the tissue's functional performance. These mechanical properties are often measured ex vivo using mechanical testing regimens, but arthroscopic handheld probes (e.g., for indentation testing, ultrasound, and optical coherence tomography) and noninvasive imaging modalities (e...
February 2, 2017: Annual Review of Biomedical Engineering
https://www.readbyqxmd.com/read/28224442/report-of-the-primary-outcomes-for-gait-mechanics-in-men-of-the-acl-sports-trial-secondary-prevention-with-and-without-perturbation-training-does-not-restore-gait-symmetry-in-men-1-or-2-years-after-acl-reconstruction
#7
Jacob John Capin, Ryan Zarzycki, Amelia Arundale, Kathleen Cummer, Lynn Snyder-Mackler
BACKGROUND: Movement asymmetries during walking are common after anterior cruciate ligament (ACL) injury and reconstruction and may influence the early development of posttraumatic osteoarthritis. Preoperative neuromuscular training (like perturbation training, which is neuromuscular training requiring selective muscle activation in response to surface perturbations) improves gait asymmetries and functional outcomes among people who are ACL-deficient, but the effect of postoperative perturbation training on gait mechanics after ACL reconstruction is unknown...
February 21, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28224370/a-dual-mode-bioreactor-system-for-tissue-engineered-vascular-models
#8
N Bono, S Meghezi, M Soncini, M Piola, D Mantovani, Gianfranco Beniamino Fiore
In the past decades, vascular tissue engineering has made great strides towards bringing engineered vascular tissues to the clinics and, in parallel, obtaining in-lab tools for basic research. Herein, we propose the design of a novel dual-mode bioreactor, useful for the fabrication (construct mode) and in vitro stimulation (culture mode) of collagen-based tubular constructs. Collagen-based gels laden with smooth muscle cells (SMCs) were molded directly within the bioreactor culture chamber. Based on a systematic characterization of the bioreactor culture mode, constructs were subjected to 10% cyclic strain at 0...
February 21, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28224297/fracture-reduction-by-postoperative-mobilisation-for-the-treatment-of-hyperextension-injuries-of-the-thoracolumbar-spine-in-patients-with-ankylosing-spinal-disorders
#9
Richard A Lindtner, Christian Kammerlander, Michael Goetzen, Alexander Keiler, Davud Malekzadeh, Dietmar Krappinger, Rene Schmid
INTRODUCTION: The aim of this study was to evaluate results of surgical stabilisation of hyperextension injuries of the thoracolumbar spine in patients with ankylosing spinal disorders using two different treatment strategies: the conventional open rigid posterior instrumentation and percutaneous less rigid posterior instrumentation. Surgical and non-surgical complications, the postoperative radiological course, and clinical outcome at final follow-up were comparatively assessed. Moreover, we sought to discuss important biomechanical and surgical aspects specific to posterior instrumentation of the ankylosed thoracolumbar spine as well as to elaborate on the advantages and limitations of the proposed new treatment strategy involving percutaneous less rigid stabilisation and fracture reduction by postoperative mobilisation...
February 21, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28222880/success-rate-and-strength-of-osseointegration-of-immediately-loaded-uv-photofunctionalized-implants-in-a-rat-model
#10
Pooya Soltanzadeh, Amirreza Ghassemi, Manabu Ishijima, Miyuki Tanaka, Wonhee Park, Chika Iwasaki, Makoto Hirota, Takahiro Ogawa
STATEMENT OF PROBLEM: Despite its clinical benefits, the immediate loading protocol might have a higher risk of implant failure than the regular protocol. Ultraviolet (UV) photofunctionalization is a novel surface enhancement technique for dental implants. However, the effect of photofunctionalization under loading conditions is unclear. PURPOSE: The purpose of this animal study was to evaluate the effect of photofunctionalization on the biomechanical quality and strength of osseointegration under loaded conditions in a rat model...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222402/impact-of-anchor-type-on-porcine-lumbar-biomechanics-finite-element-modelling-and-in-vitro-validation
#11
Martin Brummund, Vladimir Brailovski, Yvan Petit, Yann Facchinello, Jean-Marc Mac-Thiong
BACKGROUND: Rigid posterior implants used for spinal stabilization can be anchored to the vertebrae using pedicle screws or screws combined with transverse process hooks. In the present study, a finite element model of a porcine lumbar spine instrumented with screws and hooks is presented and validated. METHODS: The porcine lumbar spine model was validated using in-vitro measurements on six porcine specimens. Validation metrics included intervertebral rotations (L1 to L6) and nucleus pressure in the topmost cranial instrumented disc...
February 14, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28222170/biomechanical-investigation-of-two-plating-systems-for-medial-column-fusion-in-foot
#12
Paul Simons, Theresia Sommerer, Ivan Zderic, Dieter Wahl, Mark Lenz, Hristo Skulev, Matthias Knobe, Boyko Gueorguiev, R Geoff Richards, Kajetan Klos
BACKGROUND: Arthrodesis of the medial column (navicular, cuneiform I and metatarsal I) is performed for reasons such as Charcot arthropathy, arthritis, posttraumatic reconstruction or severe pes planus. However, the complication rate is still high and mainly resulting from inadequate fixation. Special plates, designed for medial column arthrodesis, seem to offer potential to reduce the complication rate. The aim of this study was to investigate biomechanically plantar and dorsomedial fusion of the medial column using two new plating systems...
2017: PloS One
https://www.readbyqxmd.com/read/28222145/cataract-surgery-causes-biomechanical-alterations-to-the-eye-detectable-by-corvis-st-tonometry
#13
Yoshitake Kato, Shunsuke Nakakura, Ryo Asaoka, Kanae Matsuya, Yuki Fujio, Yoshiaki Kiuchi
PURPOSE: Modern cataract surgery is generally considered to bring about modest and sustained intraocular pressure (IOP) reduction. However, the pathophysiological mechanism for this remains unclear. Moreover, a change in ocular biomechanical properties after surgery can affect the measurement of IOP. The aim of the study is to investigate ocular biomechanics, before and following cataract surgery, using Corvis ST tonometry (CST). PATIENTS AND METHODS: Fifty-nine eyes of 59 patients with cataract were analyzed...
2017: PloS One
https://www.readbyqxmd.com/read/28220362/the-role-of-impedance-planimetry-in-the-evaluation-of-esophageal-disorders
#14
REVIEW
Nitin K Ahuja, John O Clarke
PURPOSE OF REVIEW: Impedance planimetry measures tissue wall distensibility as a function of pressure and cross-sectional area. Recent interest in this technique's relevance to the gastrointestinal tract has been accelerated by the availability of the functional lumen imaging probe, a catheter-based system that dynamically quantitates these biomechanical properties. Herein, we review the device's particular utility in the setting of esophageal pathology, including processes affecting the esophageal body as well as the upper and lower esophageal sphincters...
February 2017: Current Gastroenterology Reports
https://www.readbyqxmd.com/read/28220268/anterolateral-ligament-expert-group-consensus-paper-on-the-management-of-internal-rotation-and-instability-of-the-anterior-cruciate-ligament-deficient-knee
#15
REVIEW
Bertrand Sonnery-Cottet, Matthew Daggett, Jean-Marie Fayard, Andrea Ferretti, Camilo Partezani Helito, Martin Lind, Edoardo Monaco, Vitor Barion Castro de Pádua, Mathieu Thaunat, Adrian Wilson, Stefano Zaffagnini, Jacco Zijl, Steven Claes
Purpose of this paper is to provide an overview of the latest research on the anterolateral ligament (ALL) and present the consensus of the ALL Expert Group on the anatomy, radiographic landmarks, biomechanics, clinical and radiographic diagnosis, lesion classification, surgical technique and clinical outcomes. A consensus on controversial subjects surrounding the ALL and anterolateral knee instability has been established based on the opinion of experts, the latest publications on the subject and an exchange of experiences during the ALL Experts Meeting (November 2015, Lyon, France)...
February 20, 2017: Journal of Orthopaedics and Traumatology: Official Journal of the Italian Society of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/28219088/single-bundle-versus-double-bundle-anterior-cruciate-ligament-reconstruction-a-prospective-randomized-controlled-trial-with-6-year-follow-up
#16
Paolo Adravanti, Francesco Dini, Laura de Girolamo, Massimo Cattani, Michele Attilio Rosa
Single-bundle (SB) anterior cruciate ligament (ACL) reconstruction is increasingly used in a large number of patients and it allows obtaining very good clinical and subjective results; however, functional tests show a persistent rotational instability. Biomechanical studies seem to indicate that double-bundle (DB) ACL reconstruction allows to obtain increased anterior and rotational stability compared with SB. The aim of this prospective randomized controlled study was to compare the clinical outcome and the possible osteoarthritic evolution of patients treated either with a SB (freehand transtibial femoral tunnel) or with a DB technique (outside-in for posterolateral femoral tunnel/inside-out for anteromedial femoral tunnel) at a final follow-up of 6 years...
February 20, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28218375/retrieval-and-radiographic-analysis-of-the-contour-antiprotrusio-cage
#17
Jonathan M Vigdorchik, Richard S Yoon, Susannah L Gilbert, Joseph D Lipman, Mathias P Bostrom
INTRODUCTION: Acetabular reconstruction in the setting of severe bone loss or pelvic discontinuity remains a challenging problem. Multiple methods of treatment have been described including antiprotrusio cages (APCs). The objective of this study is to combine biomechanical analysis of retrieved APCs with radiographic and clinical data to determine which factors influence or predict APC failure. METHODS: 41 APCs were identified. Sequential radiographs were examined for cage and polyethylene cup abduction angles, change in centre of rotation, screw placement, progression of cage failure, and failure mechanism...
February 8, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28217665/elastographic-measurement-of-the-cervix-during-pregnancy-current-status-and-future-challenges
#18
REVIEW
Hyunjung Kim, Han Sung Hwang
The cervix is a cylindrical structure that is proximally connected to the uterus and distally to the vaginal cavity. The Bishop score has been used to evaluate the cervix during pregnancy. However, alternatives have been evaluated because the Bishop score is uncomfortable for patients, relies on a subjective examination, and lacks internal os data. Elastography has been used to assess the cervix, as it can estimate tissue stiffness. Recent articles on elastography for cervical assessment during pregnancy have focused on its usefulness for prediction of preterm birth and successful labor induction...
January 2017: Obstetrics & Gynecology Science
https://www.readbyqxmd.com/read/28217660/reverse-total-shoulder-arthroplasty-research-models
#19
Stefano Petrillo, Umile Giuseppe Longo, Lawrence V Gulotta, Alessandra Berton, Andreas Kontaxis, Timothy Wright, Vincenzo Denaro
PURPOSE: the past decade has seen a considerable increase in the use of research models to study reverse total shoulder arthroplasty (RTSA). Nevertheless, none of these models has been shown to completely reflect real in vivo conditions. METHODS: we performed a systematic review of the literature matching the following key words: "reverse total shoulder arthroplasty" or "reverse total shoulder replacement" or "reverse total shoulder prosthesis" and "research models" or "biomechanical models" or "physical simulators" or "virtual simulators"...
October 2016: Joints
https://www.readbyqxmd.com/read/28216289/biomechanical-comparison-of-fixed-loop-and-adjustable-loop-cortical-suspensory-devices-for-metaphyseal-femoral-sided-soft-tissue-graft-fixation-in-anatomic-anterior-cruciate-ligament-reconstruction-using-a-porcine-model
#20
Darin D Nye, W Ryan Mitchell, Wei Liu, Roger V Ostrander
PURPOSE: To compare the displacement, stiffness, and ultimate failure load of a fixed-loop cortical suspensory device with 2 adjustable-loop devices when positioned on metaphyseal bone. METHODS: Thirty devices (10 of each device) were positioned on the metaphyseal cortex of 30 porcine femora simulating anatomic anterior cruciate ligament femoral tunnel placement. Bovine tendons were used for soft tissue grafts, and the constructs were then cycled 1,000 times and pulled to failure, measuring displacement, stiffness, and failure load...
February 16, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
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