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https://www.readbyqxmd.com/read/29352758/-arthroscopic-rotator-cuff-surgery-new-and-established-methods
#1
REVIEW
S Pauly, M Scheibel
This present article summarizes established and current developments and aspects of rotator cuff surgery. Achieved milestones as well as current approaches are presented and assessed with respect to their clinical and radiographic impact. Despite biomechanical and technical improvements in modern rotator cuff repair techniques, re-defect and re-tearing rates could not be fully eliminated. Meanwhile, the importance of biological processes around successful tendon-bone reintegration has been increasingly recognized...
January 19, 2018: Der Orthopäde
https://www.readbyqxmd.com/read/29352433/development-and-clinical-application-of-vertebral-metrics-using-a-stereo-vision-system-to-assess-the-spine
#2
Ana Teresa Gabriel, Cláudia Quaresma, Mário Forjaz Secca, Pedro Vieira
The biomechanical changes in the spinal column are considered to be the main responsible for rachialgia. Although radiological techniques use ionizing radiation, they are the most applied tools to assess the biomechanics of the spine. To face this problem, non-invasive techniques must be developed. Vertebral Metrics is an ionizing radiation-free instrument designed to detect the 3D position of each vertebrae in a standing position. Using a stereo vision system combined with low intensity UV light, recognition is achieved with software capable of distinguishing fluorescent marks...
January 20, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29352353/regarding-loads-after-spinal-fusion-every-level-should-be-seen-separately-a-musculoskeletal-analysis
#3
A Benditz, S Auer, J F Spörrer, S Wolkerstorfer, J Grifka, F Suess, S Dendorfer
INTRODUCTION: The number of spinal fusion surgeries is steadily increasing and biomechanical consequences are still in debate. The aim of this study is to provide biomechanical insights into the sagittal balance of the spine and to compare spinal load before and after spinal fusion. METHOD: The joint reaction forces of 52 patients were analyzed in proximo-distal and antero-posterior direction from the levels T12-L1 to L5-S1 using musculoskeletal simulations. RESULTS: In 104 simulations, pre-surgical forces were equal to post-surgical...
January 19, 2018: European Spine Journal
https://www.readbyqxmd.com/read/29351870/de-novo-generation-in-an-in-vivo-rat-model-and-biomechanical-characterization-of-autologous-transplants-for-ligament-and-tendon-reconstruction
#4
Marc Soubeyrand, Elisabeth Laemmel, Nathalie Maurel, Amadou Diop, Thierry Lazure, Jacques Duranteau, Eric Vicaut
BACKGROUND: Surgical reconstruction of ligaments and tendons is frequently required in clinical practice. The commonly used autografts, allografts, or synthetic transplants present limitations in terms of availability, biocompatibility, cost, and mechanical properties that tissue bioengineering aims to overcome. It classically combines an exogenous extracellular matrix with cells, but this approach remains complex and expensive. Using a rat model, we tested a new bioengineering strategy for the in vivo and de novo generation of autologous grafts without the addition of extracellular matrix or cells, and analyzed their biomechanical and structural properties...
December 14, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/29351262/imu-to-segment-assignment-and-orientation-alignment-for-the-lower-body-using-deep-learning
#5
Tobias Zimmermann, Bertram Taetz, Gabriele Bleser
Human body motion analysis based on wearable inertial measurement units (IMUs) receives a lot of attention from both the research community and the and industrial community. This is due to the significant role in, for instance, mobile health systems, sports and human computer interaction. In sensor based activity recognition, one of the major issues for obtaining reliable results is the sensor placement/assignment on the body. For inertial motion capture (joint kinematics estimation) and analysis, the IMU-to-segment (I2S) assignment and alignment are central issues to obtain biomechanical joint angles...
January 19, 2018: Sensors
https://www.readbyqxmd.com/read/29351182/the-management-of-partial-zone-ii-intrasynovial-flexor-tendon-lacerations-a-literature-review-of-biomechanics-clinical-outcomes-and-complications
#6
Kyle D Lineberry, Shirley Shue, Kyle J Chepla
BACKGROUND: Penetrating trauma or lacerations within zone II of the flexor sheath may result in partial tendon injury. The proper management of this injury is controversial; the literature contains differing indications for surgical treatment and post-operative rehabilitation. METHODS: A literature review of the Cochrane, Medline and Pubmed databases was performed using the following search criteria: partial, flexor, tendon, laceration. All English language studies that evaluated biomechanical strength, complications, and outcomes after partial tendon injury in human and animal studies were included and reviewed by two of the authors...
January 12, 2018: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29350644/talar-fractures-radiological-and-ct-evaluation-and-classification-systems
#7
Giuseppe Caracchini, Michele Pietragalla, Alioscia De Renzis, Michele Galluzzo, Mattia Carbone, Marcello Zappia, Anna Russo, Federico Greco, Vittorio Miele
INTRODUCTION: The talus is the second largest bone of the foot. It is fundamental to ensure normal ankle-foot movements as it connects the leg and the foot. Talar fractures are usually due to high energy traumas (road accidents, high level falls). They are not common as they account for 3-5% of ankle and foot fractures and 0.85% of all body fractures. However, talar fractures not correctly diagnosed and treated can lead to avascular necrosis of the astragalus, pseudoarthrosis, early osteoarthrisis and ankle instability, declining the quality of life of patients...
January 19, 2018: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/29350554/quadriceps-neuromuscular-function-and-jump-landing-sagittal-plane-knee-biomechanics-after-anterior-cruciate-ligament-reconstruction
#8
Sarah H Ward, Troy Blackburn, Darin A Padua, Laura E Stanley, Matthew S Harkey, Brittney A Luc-Harkey, Brian G Pietrosimone
CONTEXT:   Aberrant biomechanics may affect force attenuation at the knee during dynamic activities, potentially increasing the risk of sustaining a knee injury or hastening the development of osteoarthritis after anterior cruciate ligament reconstruction (ACLR). Impaired quadriceps neuromuscular function has been hypothesized to influence the development of aberrant biomechanics. OBJECTIVE:   To determine the association between quadriceps neuromuscular function (strength, voluntary activation, and spinal-reflex and corticomotor excitability) and sagittal-plane knee biomechanics during jump landings in individuals with ACLR...
January 19, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29350015/-application-of-finite-element-method-in-spinal-biomechanics
#9
REVIEW
Qiang Liu, Jun Zhang, Shu-Chun Sun, Fei Wang
The finite element model is one of the most important methods in study of modern spinal biomechanics, according to the needs to simulate the various states of the spine, calculate the stress force and strain distribution of the different groups in the state, and explore its principle of mechanics, mechanism of injury, and treatment effectiveness. In addition, in the study of the pathological state of the spine, the finite element is mainly used in the understanding the mechanism of lesion location, evaluating the effects of different therapeutic tool, assisting and completing the selection and improvement of therapeutic tool, in order to provide a theoretical basis for the rehabilitation of spinal lesions...
February 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29350002/-progress-on-laminoplasty-in-spinal-canal-disease
#10
Jian-Min Chen, Guo-Yin Liu, Yong Zhang, Jian-Ning Zhao
Surgery is the preferred method for the treatment of spinal canal disease, surgical method involves laminectomy and laminoplasty. The ideal spinal surgery not only should fully expose the spinal canal, completely resect the occupied position and remove the spinal cord compression, but also should maintain the stability of spinal biomechanics. Because of the different realization of clinician to safeguard and rebuild the spinal stabilization during opertion of spinal canal disease, and choice of surgical method and how to maintain the stability of spine biomechanics has become a hot of research in this field...
February 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29349990/-experimentation-of-the-relationship-between-medial-or-lateral-patellar-stabilizer-and-patellofemoral-stabilization
#11
Xing-Sen Liang, Zheng-Hong Yu, Yi-Kai Li, Ying-Ping Jiang, Xian-Wu Chen, Min Huang
OBJECTIVE: To study the contribution of medial or lateral stabilizer to the stability of the patella, to explore the function and effect of releasing the LPR clinically and to provide a biomechanical basis for the clinical treatment of patellar instability(PI). METHODS: The quadriceps femoris of 6 fresh human cadaver knees were loaded to simulate a normal condition of muscle strength. First the loading force was measured and recorded, which subluxated the patella with the different degrees of knee flexion...
April 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29349972/-current-therapy-progress-on-the-recurrent-patellar-dislocation
#12
REVIEW
Wan-Quan Cao, Zi-Quan Yang, Gang Wang, Ya-Xun Men, Xiang-Yun Cheng
Patients who suffer from the recurrent patellar dislocation mainly show the recurrent dislocation of patellar, giving way, most patients have the history of trauma or dysplasia of keen joint. Traditional therapies of recurrent patellar dislocation include medical retinaculum placation, lateral retinaculum release, tibial tubercle osteotomy, femoral trochleoplasty etc. In recent years, with the development of anatomical and biomechanical researches on medial patellofemoral ligament(MPFL), more and more experts focus on the role of MPFL played in preventing the patellar dislocation...
March 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29349964/-biomechanical-study-of-the-lateral-wall-of-the-femur-in-the-treatment-of-femoral-intertrochanteric-fracture-with-intramedullary-or-extramedullary-fixation
#13
Yin-Sheng Wu, Bing Xu, Zuo-Qu Yu, Xiao-Feng Wang, Shou-Wang Dai, Min Li, Pei-Jian Tong
OBJECTIVE: To observe the biomechanical effects of the lateral wall of the femur in treating femoral intertrochanteric fractures with intramedullary or extramedullary fixation to guide the choice of clinical fixed methods. METHODS: Twelve adults femur specimens of intertrochanteric fractures were belong to the type A1 of the AO fracture classification and randomly divided into the lateral wall complete PFNA group, the lateral wall complete PF-LCP group, the lateral wall breakage PFNA group, lateral wall breakage PF-LCP group, every group had 3 specimens...
March 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29349958/-biomechanical-analysis-of-the-correlation-between-sacral-tilt-displacement-and-l%C3%A2-s%C3%A2-disc-degeneration
#14
Ning-Ning Shi, Guo-Quan Shen, Shui-Yong He, Ru-Bao Gu, Shui-Yong He
OBJECTIVE: To biomechanical analysis of the correlation between sacral tilt displacement and L₅-S₁ disc degeneration. METHODS: From July 2011 to July 2013, 81 patients with lumbar disc herniation and sacroiliac joint disorder including 45 males and 36 females with an average age of (45.39±1.30) years ranging from 18 to 65 years old were selected. The course of the disease ranged from 1 to 144 months with an average of (12.64±2.19) months. All patients were taken lumbar spine lateral X-ray films, the lumbar curvature angle, L₄-L₅ or L₅-S₁ intervertebral gap distance between points, and the lumbosacral angle was measured and correlated analyzed...
March 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29349502/a-biomechanical-comparison-of-different-fixation-techniques-for-fractures-of-the-acetabular-posterior-wall
#15
Xinbao Wu
PURPOSE: This study aimed to evaluate the biomechanical stability of different fixation techniques for fractures of the acetabular posterior wall. The hypothesis was that a reconstruction plate, combined with compression screw fixation and a plate placed lateral to the screws, would achieve a higher peak load to failure and stiffness and reduced gapping during cycle loading than other fixation techniques. METHODS: A total of 24 Sawbone pelvis models were created with simulated fractures at the posterior wall of the acetabulum...
January 18, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29349029/puncture-capsulotomy-during-hip-arthroscopy-for-femoroacetabular-impingement-preserving-anatomy-and-biomechanics
#16
William K Conaway, Scott D Martin
We describe an arthroscopic technique for the treatment of labral pathology and femoroacetabular impingement that provides excellent access to the central and peripheral compartments while preserving the biomechanically crucial components of hip joint stability. The hip capsule and the ligaments within it have been shown to be integral to hip biomechanical stability. Other popular techniques such as interportal and T-capsulotomy inherently damage the capsuloligamentous complex of the hip and can be associated with postoperative gross instability, micro-instability, heterotopic ossification, and seroma...
December 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/29349025/anterior-capsule-reconstruction-for-irreparable-subscapularis-tears
#17
Jason P Rogers, Adam Kwapisz, John M Tokish
A subscapularis complete tear presents its own challenges in management. The glenohumeral biomechanics and force couple are reliant on a competent and functioning subscapularis muscle. An irreparable subscapularis makes those same challenges even more difficult to address. Traditionally, this problem has been addressed with tendon transfers, including pectoralis major or latissimus dorsi. These techniques can alter the ideal biomechanics of the shoulder and have high rates or failure. Iliotibial autograft or tibialis anterior have also been wrought with high failure rates...
December 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/29349008/meniscal-allograft-transplantation-made-simple-bridge-and-slot-technique
#18
Daniel J Kaplan, Sergio A Glait, William E Ryan, Michael J Alaia, Kirk A Campbell, Eric J Strauss, Laith M Jazrawi
Over recent years, appreciation for the critical role of the meniscus in joint biomechanics has led to an emphasis on meniscal preservation. Meniscal allograft transplant (MAT) is a promising biological solution for the symptomatic young patient with a meniscus-deficient knee that has not developed advanced osteoarthritis. As surgical techniques are refined and outcomes continue to improve, it is vital to consider the utility of such procedures and offer a straightforward approach to MAT. This article and accompanying video provide a step-by-step tutorial on how to perform a MAT using the bridge and slot technique, its key pearls and pitfalls as well as the relevant advantages and disadvantages of MAT...
December 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/29349007/anterior-cruciate-ligament-primary-repair-with-independent-tensioning-of-the-anteromedial-and-posterolateral-bundles
#19
Patrick A Smith, Jordan A Bley
This procedure represents an update on traditional primary repair methods by taking advantage of technological advancements to optimize soft tissue fixation and allow for an anatomic double-bundle primary repair with independent bundle tensioning and an internal brace construct to restore normal anterior cruciate ligament biomechanics.
December 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/29349003/arthroscopic-anterior-shoulder-stabilization-with-incorporation-of-a-comminuted-bony-bankart-lesion
#20
Drew Lansdown, Eamon D Bernardoni, Eric J Cotter, Anthony A Romeo, Nikhil N Verma
Bony Bankart lesions are a common finding in patients with anterior glenohumeral dislocation. Although there are no defined guidelines, small bony Bankart fractures are typically treated arthroscopically with suture anchors. The 2 main techniques used are double- and single-row suture anchor stabilization, with debate over superiority. Biomechanical studies have shown improved reduction and stabilization with the double-row over the single-row suture anchor technique; however, this has not been reported for small or comminuted bony fragments...
December 2017: Arthroscopy Techniques
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