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https://www.readbyqxmd.com/read/28328629/clinical-biomechanical-and-anatomic-investigation-of-colles-fascia-and-pubic-ramus-periosteum-for-use-during-medial-thighplasty
#1
Martin J Carney, Tim Matatov, Matthew Freeman, John Miller, Rahul Vemula, Jason Schuster, Michael Dancisak, John Lindsey, Guenevere Rae
INTRODUCTION: The medial thighplasty is a procedure where patients may attain superior mobility, hygiene, and cosmesis. Most surgeons use attachment of the superficial fascial system (SFS) of the thigh flap to the Colles fascia, whereas others attach the SFS to the pubic ramus periosteum. Because of a high complication profile, we aim to elucidate the clinical, biomechanical, and anatomic qualities of the Colles fascia versus the pubic ramus periosteum. MATERIALS AND METHODS: We performed a 17-year retrospective review documenting clinical complications, a biomechanical analysis of sutures placed in different tissue layers of the thigh, and a histologic analysis surrounding the ischiopubic ramus...
March 21, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28325640/computed-tomography-based-3-dimensional-finite-element-analyses-of-various-types-of-plates-placed-for-a-virtually-reduced-unilateral-condylar-fracture-of-the-mandible-of-a-patient
#2
Kazuhiro Murakami, Kazuhiko Yamamoto, Tsutomu Sugiura, Satoshi Horita, Yumiko Matsusue, Tadaaki Kirita
PURPOSE: This study was performed to evaluate stresses in various types of plates placed for a virtually reduced unilateral condylar fracture of the mandible using computed tomography-based 3-dimensional finite element (FE) models of a patient to select the optimal plate system. MATERIALS AND METHODS: A computed tomography-based FE model of the mandible of a patient with a unilateral condylar fracture was constructed. The fracture was virtually reduced and fixed with 1 straight titanium plate; 2 straight titanium plates; 2 straight poly-L-lactic acid plates; and 4-hole (box), 5-hole (strut), and 7-hole (lambda) condylar plates...
February 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28324248/incorporation-of-flaxseed-flour-as-a-dietary-source-for-ala-increases-bone-density-and-strength-in-post-partum-female-rats
#3
Danielle Cavalcante Ribeiro, Aline D'Avila Pereira, Fernanda Carvalho de Santana, Jorge Mancini-Filho, Eduardo Moreira da Silva, Carlos Alberto Soares da Costa, Gilson Teles Boaventura
In women, bone mass undergoes changes during pregnancy and the postpartum period, which has a risk for subsequent development of osteoporosis. Thus, the present study aims to evaluate the effects of flaxseed flour in femur quality during post-weaning of dam rats. After weaning, the rats were divided into control (C, n = 7) and experimental (F, n = 7) groups treated with a diet containing 25 g of flaxseed flour in the lactating period and 15 g in the maintenance period. After 51 days post-partum, serum hormone, fatty acids composition, bone compartments, computed tomography, and biomechanical analyses were determined...
March 21, 2017: Lipids
https://www.readbyqxmd.com/read/28323715/the-safety-and-strength-of-a-novel-medial-partial-nonthreaded-pedicle-screw-a-cadaveric-and-biomechanical-investigation
#4
Mun Keong Kwan, Chris Yin Wei Chan, Lim Beng Saw, Shanmugam Rukmanikanthan, Lawrence G Lenke
STUDY DESIGN: Cadaveric and biomechanical study. OBJECTIVE: The aim of this study was to assess the safety and pullout strength of medial, partial nonthreaded thoracic pedicle screws compared with conventional screws. SUMMARY OF BACKGROUND DATA: The perforation rate of the pedicle screws has been reported as high as 41%. Nerve injury and irritation can result from the compression of malpositioned screw on neural structures. METHODS: Ten fresh cadavers were studied...
April 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28323708/fenestrated-screws-augmented-with-pmma-increase-the-pullout-strength-of-sacral-pedicle-screws
#5
Matthew Colman, Jonathan Pond, Kent Bachus, Brandon D Lawrence, William R Spiker, Darrel S Brodke
STUDY DESIGN: Biomechanics. OBJECTIVE: The objective of this study was to compare the fixation in osteoporotic specimens of a bicortical sacral pedicle screw to the following constructs: a unicortical solid screw augmented with polymethylmethacrylate (PMMA) (TRACT), a unicortical fenestrated screw augmented with PMMA (FEN), and a bicortical screw/sacral alar screw combination (PED/ALA). SUMMARY OF BACKGROUND DATA: Rigid posterior sacral fixation of osteoporotic spines is problematic due to poor bone quality...
April 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28319258/ct-derived-indices-of-canine-osteosarcoma-affected-antebrachial-strength
#6
Tanya C Garcia, Michele A Steffey, Allison L Zwingenberger, Leticia Daniel, Susan M Stover
OBJECTIVE: To improve the prediction of fractures in dogs with bone tumors of the distal radius by identifying computed tomography (CT) indices that correlate with antebrachial bone strength and fracture location. STUDY DESIGN: Prospective experimental study. ANIMALS: Dogs with antebrachial osteosarcoma (n = 10), and normal cadaver bones (n=9). METHODS: Antebrachia were imaged with quantitative CT prior to biomechanical testing to failure...
March 20, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28315339/elastic-microfibril-distribution-in-the-cornea-differences-between-normal-and-keratoconic-stroma
#7
Tomas L White, Philip N Lewis, Robert D Young, Koji Kitazawa, Tsutomu Inatomi, Shigeru Kinoshita, Keith M Meek
The optical and biomechanical properties of the cornea are largely governed by the collagen-rich stroma, a layer that represents approximately 90% of the total thickness. Within the stroma, the specific arrangement of superimposed lamellae provides the tissue with tensile strength, whilst the spatial arrangement of individual collagen fibrils within the lamellae confers transparency. In keratoconus, this precise stromal arrangement is lost, resulting in ectasia and visual impairment. In the normal cornea we previously characterised the three-dimensional arrangement of an elastic fiber network spanning the posterior cornea from limbus-to-limbus...
March 14, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28315016/biomechanics-of-the-osteoporotic-spine-pain-and-principles-of-training
#8
Guido Schröder, Andreas Knauerhase, Holger S Willenberg, Guenther Kundt, Detlef Wendig, Hans-Christof Schober
INTRODUCTION: A fracture is a clinical manifestation of osteoporosis and is one of the main causes of functional limitations and chronic pain in patients with osteoporosis. Muscle and coordination training are recommended to the patients as general measures. We inquired whether sling training is better than traditional physiotherapy in relieving pain and improving abilities of daily living. METHODS: Fifty patients with osteoporosis were divided into two groups. Group A performed conventional physiotherapy, while Group B performed sling training exercises...
March 17, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28303909/sprint-interval-training-induces-a-sexual-dimorphism-but-does-not-improve-peak-bone-mass-in-young-and-healthy-mice
#9
Kathrin Koenen, Isabell Knepper, Madlen Klodt, Anja Osterberg, Ioannis Stratos, Thomas Mittlmeier, Tina Histing, Michael D Menger, Brigitte Vollmar, Sven Bruhn, Brigitte Müller-Hilke
Elevated peak bone mass in early adulthood reduces the risk for osteoporotic fractures at old age. As sports participation has been correlated with elevated peak bone masses, we aimed to establish a training program that would efficiently stimulate bone accrual in healthy young mice. We combined voluntary treadmill running with sprint interval training modalities that were tailored to the individual performance limits and were of either high or intermediate intensity. Adolescent male and female STR/ort mice underwent 8 weeks of training before the hind legs were analyzed for cortical and trabecular bone parameters and biomechanical strength...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28299515/the-influence-of-slope-on-spartium-junceum-root-system-morphological-anatomical-and-biomechanical-adaptation
#10
Fabio Lombardi, G S Scippa, B Lasserre, A Montagnoli, R Tognetti, M Marchetti, D Chiatante
Root systems have a pivotal role in plant anchorage and their mechanical interactions with the soil may contribute to soil reinforcement and stabilization of slide-prone slopes. In order to understand the responses of root system to mechanical stress induced by slope, samples of Spartium junceum L., growing in slope and in plane natural conditions, were compared in their morphology, biomechanical properties and anatomical features. Soils sampled in slope and plane revealed similar characteristics, with the exception of organic matter content and penetrometer resistance, both higher in slope...
March 15, 2017: Journal of Plant Research
https://www.readbyqxmd.com/read/28298464/the-achilles-tendon-is-mechanosensitive-in-older-adults-adaptations-following-14%C3%A2-weeks-versus-1-5%C3%A2-years-of-cyclic-strain-exercise
#11
Gaspar Epro, Andreas Mierau, Jonas Doerner, Julian A Luetkens, Lukas Scheef, Guido M Kukuk, Henning Boecker, Constantinos N Maganaris, Gert-Peter Brüggemann, Kiros Karamanidis
The aging musculoskeletal system experiences a general decline in structure and function, characterized by a reduced adaptability to environmental stress. We investigated whether the older human Achilles tendon (AT) demonstrates mechanosensitivity (via biomechanical and morphological adaptations) in response to long-term mechanical loading. Thirty-four female adults (60-75 years) were allocated to either a medium-term (14 weeks; N=21) high AT strain cyclic loading exercise intervention or a control group (N=13), with 12 participants continuing with the intervention for 1...
March 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28296717/abdominal-wall-allograft-preclinical-biomechanical-investigation-of-a-novel-reconstructive-adjunct
#12
Brent R DeGeorge, Jonathan Bryce Olenczak, Angela Pineros-Fernandez, Raymond F Morgan, Patrick S Cottler, David B Drake
INTRODUCTION: Acellular dermal matrices have revolutionized abdominal wall reconstruction; however, device failure and hernia recurrence remain significant problems. Fascia grafts are a reconstructive adjunct with increased tensile strength compared with acellular dermal matrices; however, clinical use is limited by insufficient donor material and donor site morbidity. To this end, we investigate the biomechanical properties of human abdominal wall allografts (AWAs) consisting of the anterior rectus sheath from xiphoid to pubis...
March 14, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28291948/eccentric-training-for-tendon-healing-after-acute-lesion-a-rat-model
#13
Jean-François Kaux, Vincent Libertiaux, Pierre Leprince, Marianne Fillet, Vincent Denoel, Clémence Wyss, Christelle Lecut, André Gothot, Caroline Le Goff, Jean-Louis Croisier, Jean-Michel Crielaard, Pierre Drion
BACKGROUND: The tendon is a dynamic entity that remodels permanently. Platelet-rich plasma (PRP) injection has been shown to have a beneficial effect on tendon healing after lesion in rats. Furthermore, eccentric exercise seems to improve the mechanical quality of the tendon. HYPOTHESIS: A combination of PRP injection and eccentric training might be more effective than either treatment alone. STUDY DESIGN: Controlled laboratory study. METHODS: Adult male rats were anesthetized, an incision was performed in the middle of their left patellar tendon and an injection of physiological fluid (PF) or homologous PRP was randomly made at the lesion level...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28288923/effects-of-alendronateon-lumbar-intervertebral-disc-degeneration-with-bone-loss-in-ovariectomized-rats
#14
Huiping Song, Yang Luo, Wenya Wang, Shuyang Li, Kai Yang, Muwei Dai, Yong Shen, Yingze Zhang, Liu Zhang
BACKGROUND CONTEXT: Osteoporosis adversely affects disc degeneration cascades, and prophylactic alendronate (ALN) helps delay intervertebral disc degeneration (IDD) in ovariectomized (OVX) rats. However, there remains no information regarding whether ALN affects IDD with bone loss. PURPOSE: This study aimed to observe the effects of ALN on degenerative discs with bone loss induced by OVX in rats. STUDY DESIGN: Controlled in vivo experiments in rodents...
March 10, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28288334/trunk-biomechanics-during-hemiplegic-gait-after-stroke-a-systematic-review
#15
REVIEW
Tamaya Van Criekinge, Wim Saeys, Ann Hallemans, Silke Velghe, Pieter-Jan Viskens, Luc Vereeck, Willem De Hertogh, Steven Truijen
Stroke commonly results in trunk impairments that are associated with decreased trunk coordination and limited trunk muscle strength. These impairments often result in biomechanical changes during walking. Additionally, the so-called pelvic step might be influenced by these impairments. Therefore, the aim of this review was twofold. First, to gain more insight into trunk biomechanics during walking in stroke patients compared to healthy individuals. Second, to investigate the influence of walking speed on trunk biomechanics...
March 4, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28286624/a-biomechanical-comparison-of-4-strand-and-5-strand-anterior-cruciate-ligament-graft-constructs
#16
Matthew L Broadhead, Animesh A Singla, Nicky Bertollo, David Broe, William R Walsh
Hamstring tendon autografts are used for reconstruction of the anterior cruciate ligament. This study tested the hypothesis that a 5-strand hamstring autograft construct is superior in strength to a 4-strand construct. Four-strand and 5-strand tendon grafts constructs were prepared from ovine flexor tendons and then tested in a uniaxial electromechanical load system with suspensory fixation. The 4-strand and 5-strand constructs were pre-conditioned, stress-relaxed and loaded to ultimate failure. Stress-relaxation, stiffness and ultimate load were compared using a one-way ANOVA...
February 20, 2017: Orthopedic Reviews
https://www.readbyqxmd.com/read/28284491/hexagonal-grafts-in-mosaicplasty-biomechanical-comparison-of-standard-cylindrical-and-novel-hexagonal-grafts-in-calf-cadaver-model
#17
Adem Kar, Nihat Demirhan Demirkıran, Hasan Tatari, Bora Uzun, Fatih Ertem
OBJECTIVE: Cylindrical grafts are currently used to cover defected area in mosaicplasty. However, there are some difficulties with cylindrical grafts, such as potential dead space between grafts and insufficient coverage. Hexagonal graft (honeycomb model) was created and evaluated in this biomechanical study. Hypothesis was that harvesting grafts with hexagonal shape, which has the best volume geometry characteristics in nature, would be biomechanically advantageous and provide superior pull-out strength...
March 8, 2017: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/28282882/maternal%C3%A2-consumption%C3%A2-of%C3%A2-hesperidin%C3%A2-and%C3%A2-naringin%C3%A2-flavanones%C3%A2-exerts%C3%A2-transient%C3%A2-effects%C3%A2-to%C3%A2-tibia%C3%A2-bone%C3%A2-structure%C3%A2-in%C3%A2-female%C3%A2-cd-1%C3%A2-offspring
#18
Sandra M Sacco, Caitlin Saint, Paul J LeBlanc, Wendy E Ward
Hesperidin (HSP) and naringin (NAR), flavanones rich in citrus fruits, support skeletal integrity in adult and aging rodent models. This study determined whether maternal consumption of HSP and NAR favorably programs bone development, resulting in higher bone mineral density (BMD) and greater structure and biomechanical strength (i.e., peak load) in female offspring. Female CD-1 mice were fed a control diet or a HSP + NAR diet five weeks before pregnancy and throughout pregnancy and lactation. At weaning, female offspring were fed a control diet until six months of age...
March 8, 2017: Nutrients
https://www.readbyqxmd.com/read/28282242/influence-of-the-injury-to-surgery-interval-on-the-healing-potential-of-human-anterior-cruciate-ligament-derived-cells
#19
Takao Inokuchi, Tomoyuki Matsumoto, Koji Takayama, Naoki Nakano, Shurong Zhang, Daisuke Araki, Takehiko Matsushita, Ryosuke Kuroda
BACKGROUND: Vascular CD34+ cells in anterior cruciate ligament (ACL) tissue have the potential for high proliferation and multilineage differentiation that can accelerate tendon-bone healing. While patient characteristics, such as age, can affect tendon-bone healing, the influence of elapsed time after injury on the healing process is unclear. HYPOTHESIS: Cells obtained during the early phase after injury will exhibit a greater tendon-bone healing potential compared with chronic phase counterparts when applied to an immunodeficient rat model of ACL reconstruction...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28277592/evaluation-of-the-effects-of-the-metha-short-stem-on-periprosthetic-bone-remodelling-in-total-hip-arthroplasties-results-at-48-months
#20
Paolo D Parchi, Gianluca Ciapini, Iacopo Castellini, Claudia Mannucci, Anna Maria Nucci, Nicola Piolanti, Silvia Maffei, Michele Lisanti
INTRODUCTION: Total hip arthroplasty is one of the most performed procedures in orthopaedic surgery. Implantation of a prosthesis determines changes in the distribution of loads on the host bone, and this phenomenon, known as stress shielding, is related to the biomechanical characteristics of the implant. Usually stress shielding involves the proximal portion of the femur by reducing the mechanical strength and ability to withstand the transmitted loads. The aim of our study is to demonstrate how the use of a short hip stem reduces the stress shielding phenomenon to the proximal femur...
March 9, 2017: Surgical Technology International
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