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https://www.readbyqxmd.com/read/28445366/biomechanical-integrity-in-craniofacial-surgery-calvarial-reconstruction-in-favorable-and-infected-defects-with-bone-morphogenetic-protein-2
#1
Zoe M MacIsaac, Sarah E Henderson, Sameer Shakir, Sanjay Naran, Darren M Smith, Liliana Camison, James J Cray, Alejandro J Almarza, Gregory M Cooper, Joseph E Losee
BACKGROUND: The limitations of autologous and alloplastic reconstruction for craniofacial bone defects have created a clinical need for viable tissue-engineering strategies. Recombinant human bone morphogenetic protein-2 (rhBMP-2) has shown promise in this setting. The aim of this study was to determine the long-term biomechanical properties of rhBMP-2-mediated calvarial reconstruction. METHODS: Twelve-week-old New Zealand White rabbits underwent subtotal calvarectomy...
May 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28443169/radiographic-analysis-of-the-lumbosacral-juncture-is-there-a-critical-sacral-angle-for-total-disc-replacement
#2
Rattalerk Arunakul, Melodie Metzger, Linda Kanim, Hyun Bae, Michael Kropf, Rick Delamarter
STUDY DESIGN: Retrospective review of a patient cohort through a prospective study. PURPOSE: To determine whether there are correlations between radiographic measurements, including sacral slope (SS) and pelvic incidence (PI), and self-reported clinical outcomes among single-level L5/S1 ProDisc-L patients. OVERVIEW OF LITERATURE: The lumbosacral juncture presents unique biomechanical challenges with respect to artificial disc replacement (ADR) because of its orientation and consequential shear loading...
April 2017: Asian Spine Journal
https://www.readbyqxmd.com/read/28442297/vertebral-and-femoral-bone-mineral-density-and-bone-strength-in-prostate-cancer-patients-assessed-in-phantomless-pet-ct-examinations
#3
Benedikt J Schwaiger, David L Kopperdahl, Lorenzo Nardo, Luca Facchetti, Alexandra S Gersing, Jan Neumann, Kwang J Lee, Tony M Keaveny, Thomas M Link
PURPOSE: Bone fracture risk assessed ancillary to positron emission tomography with computed tomography co-registration (PET/CT) could provide substantial clinical value to oncology patients with elevated fracture risk without introducing additional radiation dose. The purpose of our study was to investigate the feasibility of obtaining valid measurements of bone mineral density (BMD) and finite element analysis-derived bone strength of the hip and spine using PET/CT examinations of prostate cancer patients by comparing against values obtained using routine multidetector-row computed tomography (MDCT) scans-as validated in previous studies-as a reference standard...
April 22, 2017: Bone
https://www.readbyqxmd.com/read/28441055/ex-vivo-biomechanical-evaluation-of-pigeon-columba-livia-cadaver-intact-humeri-and-ostectomized-humeri-stabilized-with-caudally-applied-titanium-locking-plate-or-stainless-steel-nonlocking-plate-constructs
#4
Brett G Darrow, Jeffrey J Biskup, Joseph P Weigel, Michael P Jones, Xie Xie, Peter K Liaw, Josh L Tharpe, Aashish Sharma, Dayakar Penumadu
OBJECTIVE To evaluate mechanical properties of pigeon (Columba livia) cadaver intact humeri versus ostectomized humeri stabilized with a locking or nonlocking plate. SAMPLE 30 humeri from pigeon cadavers. PROCEDURES Specimens were allocated into 3 groups and tested in bending and torsion. Results for intact pigeon humeri were compared with results for ostectomized humeri repaired with a titanium 1.6-mm screw locking plate or a stainless steel 1.5-mm dynamic compression plate; the ostectomized humeri mimicked a fracture in a thin cortical bone...
May 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28441054/biomechanical-and-histologic-evaluation-of-the-effects-of-underwater-treadmill-exercise-on-horses-with-experimentally-induced-osteoarthritis-of-the-middle-carpal-joint
#5
Melissa R King, Kevin K Haussler, Chris E Kawcak, C Wayne McIlwraith, Raoul F Reiser, David D Frisbie, Natasha M Werpy
OBJECTIVE To evaluate the effects of exercise in an underwater treadmill (UWT) on forelimb biomechanics and articular histologic outcomes in horses with experimentally induced osteoarthritis of the middle carpal joint. ANIMALS 16 horses. PROCEDURES An osteochondral fragment was induced arthroscopically (day 0) in 1 middle carpal joint of each horse. Beginning on day 15, horses were assigned to exercise in a UWT or in the UWT without water (simulating controlled hand walking) at the same speed, frequency, and duration...
May 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28439163/superolateral-dislocation-of-bilateral-intact-mandibular-condyles-a-rare-case-series
#6
Satishkumar G Patil, Bindu S Patil, Udupikrishna Joshi, B M Rudagi, Aafreen Aftab
BACKGROUND AND PURPOSE: The dislocation of mandibular condyle is a clinical condition in which the head of condyle has been displaced out of the glenoid fossa. Complete dislocation of the mandibular condyle can occur in anterior, posterior, lateral and superior direction. Among these dislocations, bilateral superolateral dislocation of mandibular condyles is quite rare and often misdiagnosed. Because of its rare occurrence and unusual clinical course, the best treatment is debatable. PATIENTS AND METHOD: We present the first case series of true bilateral superolateral dislocation of intact mandibular condyles (Type 2B) without fracturing the Zygomatic arch, associated with symphysis fracture...
June 2017: Journal of Maxillofacial and Oral Surgery
https://www.readbyqxmd.com/read/28437717/traumatic-axonal-injury-a-clinical-pathological-correlation
#7
N Davceva, A Sivevski
Traumatic axonal injury (TAI) is a distinct clinicopathological entity that can cause serious impairment of the brain function and can sometimes be found as a concrete cause of death. It has been discussed from the perspective of its biomechanical importance, and also from the standpoint of certain criteria for the pathological diagnosis of TAI. However, since the time when DAI (diffuse axonal injury) was initially described, there have been few, if any, discussions about the clinical-pathological correlation in TAI...
April 14, 2017: Journal of Forensic and Legal Medicine
https://www.readbyqxmd.com/read/28437354/complete-spondylectomy-using-orthogonal-spinal-fixation-and-combined-anterior-and-posterior-approaches-for-thoracolumbar-spinal-reconstruction-technical-nuances-and-clinical-results
#8
Hasan A Zaidi, Al-Wala Awad, Curtis A Dickman
STUDY DESIGN: Retrospective chart review. OBJECTIVE: To determine the long-term efficacy of 2-stage total en bloc spondylectomy (TES). SUMMARY OF BACKGROUND DATA: TES is a well-described technique to achieve tumor-free margins, but it is a highly destabilizing procedure that necessitates spinal reconstruction. A 2-stage anterior/posterior approach for tumor resection and instrumentation has been shown to be biomechanically superior to the single-stage approach in achieving rigid fixation, but few clinical studies with long-term outcomes exist...
May 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28437331/do-the-position-and-orientation-of-the-crosslink-influence-the-stiffness-of-spinal-instrumentation
#9
Zhuo Wang, Toshihiko Sakakibara, Takamasa Yoshikawa, Tadashi Inaba, Yuichi Kasai
STUDY DESIGN: Biomechanical study of double-level pedicle screw constructs with or without crosslinks (CL) in an unstable model. OBJECTIVES: The purpose of this study is to investigate the optimal position and orientation of the CL. SUMMARY OF BACKGROUND DATA: Several reports have described biomechanical research on such CL, but no definite consensus has been reached regarding the effects. Very few studies have examined the position and orientation of the CL...
May 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28436878/biofeedback-for-gait-retraining-based-on-real-time-estimation-of-tibiofemoral-joint-contact-forces
#10
Claudio Pizzolato, Monica Reggiani, David J Saxby, Elena Ceseracciu, Luca Modenese, David G Lloyd
Biofeedback assisted rehabilitation and intervention technologies have the potential to modify clinically relevant biomechanics. Gait retraining has been used to reduce the knee adduction moment, a surrogate of medial tibiofemoral joint loading often used in knee osteoarthritis research. In this study we present an electromyogram-driven neuromusculoskeletal model of the lower-limb to estimate, in real-time, the tibiofemoral joint loads. The model included 34 musculotendon units spanning the hip, knee, and ankle joints...
April 18, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28433451/prospective-randomized-study-comparing-two-cephalomedullary-nails-for-elderly-intertrochanteric-fractures-zimmer-natural-nail-versus-proximal-femoral-nail-antirotation-ii
#11
Young-Soo Shin, Jin-Eon Chae, Tae-Wook Kang, Seung-Beom Han
OBJECTIVES: Although both clinical and biomechanical studies suggest that cephalomedullary implants have a mechanical advantage over extramedullary implants, a high rate of complications or implant failure remains in elderly patients with osteoporosis. In an attempt to address some of these challenges, new implants with improved designs named proximal femoral nail antirotation II (PFNA II) and Zimmer natural nail (ZNN) were developed for elderly patients. Although the PFNA II reportedly has good clinical outcomes, it is unclear which implant achieves better safety and efficacy for treating intertrochanteric hip fractures...
April 13, 2017: Injury
https://www.readbyqxmd.com/read/28431622/quantitative-biomechanical-assessment-of-trunk-control-in-huntington-s-disease-reveals-more-impairment-in-static-than-dynamic-tasks
#12
Deb A Kegelmeyer, Sandra K Kostyk, Nora E Fritz, Marianne M Fiumedora, Ajit Chaudhari, Marilly Palettas, Gregory Young, Anne D Kloos
Postural instability is common in individuals with Huntington's disease (HD), yet little is known about control of the trunk during static and dynamic activities. We compared the trunk motion of 41 individuals with HD and 36 controls at thoracic and pelvic levels during sitting, standing, and walking using wearable iPod sensors. We also examined the ability of individuals with HD to respond to an auditory cue to modify trunk position when the pelvis moved >8° in sagittal or frontal planes during sitting using custom software...
May 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28429087/the-abdoman-an-artificial-abdominal-wall-simulator-for-biomechanical-studies-on-laparotomy-closure-techniques
#13
L F Kroese, J J Harlaar, C Ordrenneau, J Verhelst, G Guérin, F Turquier, R H M Goossens, G-J Kleinrensink, J Jeekel, J F Lange
PURPOSE: Incisional hernia remains a frequent complication after abdominal surgery associated with significant morbidity and high costs. Animal and clinical studies have exhibited some limitations. The purpose of this study was to develop an artificial human abdominal wall (AW) simulator in order to enable investigations on closure modalities. We hypothesized that a physical model of the human AW would give new insight into commonly used suture techniques representing a substantial complement or alternative to clinical and animal studies...
April 20, 2017: Hernia: the Journal of Hernias and Abdominal Wall Surgery
https://www.readbyqxmd.com/read/28428912/biomechanical-evaluation-of-carpal-kinematics-during-simulated-wrist-motion
#14
Helen Stoesser, Clare E Padmore, Masao Nishiwaki, Braden Gammon, G Daniel G Langohr, James A Johnson
Background Flexion and extension of the wrist is achieved primarily at the radiocarpal and midcarpal joints. Carpal kinematics have been investigated, although there remains no consensus regarding the relative contribution of each bone to wrist motion. Purpose To determine the kinematics of the scaphoid, lunate, and capitate during unconstrained simulated wrist flexion/extension and to examine the effect of motion direction on the contribution of each bone. Materials and Methods Seven cadaveric upper extremities were tested in a passive wrist simulator with 10N tone loads applied to the wrist flexors/extensors...
May 2017: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/28428909/a-biomechanical-perspective-on-distal-radioulnar-joint-instability
#15
Shohei Omokawa, Akio Iida, Kenji Kawamura, Yasuaki Nakanishi, Takamasa Shimizu, Tsutomu Kira, Tadanobu Onishi, Naoki Hayami, Yasuhito Tanaka
Background The purpose of this article was to review the anatomy, kinematics of the distal radioulnar joint (DRUJ), and to discuss definition, classification, and diagnosis of DRUJ instability. Methods A biomechanical perspective on physical examination of DRUJ ballottement test was documented. Physiological dynamic DRUJ translation and differences of the translation following sequential ligament sectioning and changes in different forearm and wrist positions were demonstrated. The clinical significance of each ligament's contribution to joint stability in specific wrist positions was addressed...
May 2017: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/28427319/mechanobiological-modelling-of-tendons-review-and-future-opportunities
#16
Mark S Thompson, M Nazri Bajuri, Hanifeh Khayyeri, Hanna Isaksson
Tendons are adapted to carry large, repeated loads and are clinically important for the maintenance of musculoskeletal health in an increasing, actively ageing population, as well as in elite athletes. Tendons are known to adapt to mechanical loading. Also, their healing and disease processes are highly sensitive to mechanical load. Computational modelling approaches developed to capture this mechanobiological adaptation in tendons and other tissues have successfully addressed many important scientific and clinical issues...
May 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28426251/current-concepts-of-the-anterolateral-ligament-of-the-knee-anatomy-biomechanics-and-reconstruction
#17
Matthew J Kraeutler, K Linnea Welton, Jorge Chahla, Robert F LaPrade, Eric C McCarty
In 1879, Paul Segond described an avulsion fracture (now known as a Segond fracture) at the anterolateral proximal tibia with the presence of a fibrous band at the location of this fracture. Although references to this ligament were occasionally made in the anatomy literature after Segond's discovery, it was not until 2012 that Vincent et al named this ligament what we know it as today, the anterolateral ligament (ALL) of the knee. The ALL originates near the lateral epicondyle of the distal femur and inserts on the proximal tibia near Gerdy's tubercle...
April 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28425833/management-of-missing-second-premolars-using-miniscrews-an-elective-solution-for-critical-anchorage-conditions
#18
Aldo Giancotti, Federica Paoncelli, Francesco Germano
Growing patients with congenital missing second premolars should be accurately evaluated in order to establish an appropriate treatment plan. The decision whether to close or maintain spaces in dental arches caused by missing teeth should be based on the consideration of biomechanical factors and the aesthetic traits of individual patients. Accordingly, the choice of closing spaces requires an adequate consideration of biomechanical principles in order to avoid detrimental effects on the occlusion and profile...
April 20, 2017: Journal of Orthodontics
https://www.readbyqxmd.com/read/28425209/identification-of-dynamic-load-for-prosthetic-structures
#19
Dequan Zhang, Xu Han, Zhongpu Zhang, Jie Liu, Chao Jiang, Nobuhiro Yoda, Xianghua Meng, Qing Li
Dynamic load exists in numerous biomechanical systems and its identification signifies a critical issue for characterizing dynamic behaviors and studying biomechanical consequence of the systems. This study aims to identify dynamic load in the dental prosthetic structures, namely three-unit implant-supported fixed partial denture (I-FPD) and teeth-supported fixed partial denture (T-FPD). The three-dimensional (3D) finite element (FE) models were constructed through patient's computerized tomography (CT) images...
April 20, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28419809/knee-biomechanics-during-jogging-after-arthroscopic-partial-meniscectomy-a-longitudinal-study
#20
Michelle Hall, Tim V Wrigley, Ben R Metcalf, Rana S Hinman, Flavia M Cicuttini, Alasdair R Dempsey, David G Lloyd, Kim L Bennell
BACKGROUND: Altered knee joint biomechanics is thought to play a role in the pathogenesis of knee osteoarthritis and has been reported in patients after arthroscopic partial meniscectomy (APM) while performing various activities. Longitudinally, understanding knee joint biomechanics during jogging may assist future studies to assess the implications of jogging on knee joint health in this population. PURPOSE: To investigate knee joint biomechanics during jogging in patients 3 months after APM and a healthy control group at baseline and 2 years later at follow-up...
April 1, 2017: American Journal of Sports Medicine
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