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https://www.readbyqxmd.com/read/28814027/challenges-in-using-compliant-ligaments-for-position-estimation-within-robotic-joints
#1
Felix Russell, Lei Gao, Peter Ellison, Ravi Vaidyanathan
The mechanical advantages of bio-inspired condylar robotic knee joints for use in prosthetics or rehabilitation has been argued extensively in literature. A common limitation of these designs is the difficulty of estimating joint angle and therefore accurately controlling the joint. Furthermore, the potential role of ligament-like structures in robotic knees is not very well established. In this work, we investigate the role of compliant stretch sensing ligaments and their integration into a condylar robotic knee...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28808696/psychological-stress-alters-extracellular-matrix-metabolism-in-mandibular-condylar-cartilage
#2
Qiang Li, Fei Huang, Jia Liu, Yin Hua Zhao, Min Zhang, Yong Jin Chen
OBJECTIVE: To explore the effect of long-term stress on the temporomandibular joint (TMJ) condyle and its possible underlying mechanism. METHODS: A 12-week, chronic unpredictable mild stress (CUMS) model was used to induce long-term psychological stress in rats. Rats were randomly divided into control group (CONT), chronic unpredictable mild stress group (CUMS) and chronic unpredictable mild stress with fluoxetine treatment group (CUMS + DT) (n = 30 per group). A 5 mg/kg dose of fluoxetine was intraperitoneally injected daily 0...
2017: Chinese Journal of Dental Research
https://www.readbyqxmd.com/read/28805021/towards-establishing-a-standardized-magnetic-resonance-imaging-scoring-system-for-temporomandibular-joints-in-juvenile-idiopathic-arthritis
#3
Mirkamal A Tolend, Marinka Twilt, Randy Q Cron, Nikolay Tzaribachev, Saurabh Guleria, Thekla von Kalle, Bernd Koos, Elka Miller, Jennifer Stimec, Yoginder Vaid, Tore A Larheim, Troels Herlin, Lynn Spiegel, Emilio Inarejos, Rahim Moineddin, Marion A van Rossum, Rotraud K Saurenmann, Andrea S Doria, Christian J Kellenberger
OBJECTIVES: The temporomandibular joints (TMJs) are frequently affected in children with juvenile idiopathic arthritis (JIA). Early detection is challenging, as major variation is present in scoring TMJ pathology on Magnetic Resonance Imaging (MRI). Consensus-driven development and validation of a MRI scoring system for TMJs has important clinical utility in timely improvement of diagnosis, and serving as an outcome measure. We report on a multi-institutional collaboration towards developing a TMJ MRI scoring system for JIA...
August 13, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28800889/spatio-temporal-expression-patterns-of-wnt-signaling-pathway-during-the-development-of-temporomandibular-condylar-cartilage
#4
Kan Chen, Huixin Quan, Gang Chen, Di Xiao
There is a growing body of evidence supporting the involvement of the Wnt signaling pathway in various aspects of skeletal and joint development; however, it is unclear whether it is involved in the process of temporomandibular joint development. In order to clarify this issue, we examined the spatio-temporal distribution of mRNAs and proteins of the Wnt family during the formation of the mandibular condylar cartilage at the prenatal and postnatal stages. An in situ hybridization test revealed no mRNAs of β-catenin and Axin2 during early mesenchymal condensation; the ligands surveyed in this study (including Wnt-4, 5a, and 9a) were clearly detected at various ranges of expression, mainly in the condylar blastema and later distinct cartilaginous layers...
August 8, 2017: Gene Expression Patterns: GEP
https://www.readbyqxmd.com/read/28799446/a-simple-method-for-accurate-rotational-positioning-of-the-femoral-component-in-total-knee-arthroplasty
#5
Eirik Aunan, Daniel Østergaard, Arn Meland, Ketil Dalheim, Leiv Sandvik
Background and purpose - There are many techniques for placing the femoral component in correct rotational alignment in total knee arthroplasty (TKA), but only a few have been tested against the supposed gold standard, rotation determined by postoperative computed tomography (CT). We evaluated the accuracy and variability of a new method, the clinical rotational axis (CRA) method, and assessed the association between the CRA and knee function. Patients and methods - The CRA is a line derived from clinical judgement of information from the surgical transepicondylar axis, the anteroposterior axis, and the posterior condylar line...
August 11, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28796103/does-idiopathic-bone-cavity-involving-mandibular-condyle-need-surgical-intervention-of-bone-cavity-filling
#6
Wenhao Zhang, Minjie Chen, Chi Yang, Zixiang Han, Wenbin Wei, Ying Chai
Idiopathic bone cavity (IBC) is a rare, asymptomatic, unilateral, oval-shaped radiolucent defect in the mandible. It is extremely rare that IBC occurs in the mandibular branch and condylar process. This article presents a 16-year-old male with IBC occuring in the mandibular branch.
August 8, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28780003/outcomes-of-gartland-type-iii-supracondylar-fractures-treated-using-blount-s-method
#7
C Muccioli, S ElBatti, I Oborocianu, O Rosello, F Solla, E Chau, J L Clement, V Rampal
BACKGROUND: Supracondylar fractures of the elbow with major displacement are usually treated by surgical pinning and less often non-operatively as described by Blount.The objective of this study was to assess the clinical and radiological outcomes of Gartland type III supracondylar fractures treated at least 3 years earlier using Blount's method. HYPOTHESIS: Blount's method produces good outcomes after more than 3 years when used to treat Gartland type III supracondylar fractures of the humerus...
August 2, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28770298/no-influence-of-femoral-component-rotation-by-the-lateral-femoral-posterior-condylar-cartilage-remnant-technique-on-clinical-outcomes-in-navigation-assisted-tka
#8
Seong Hwan Kim, Yong-Beom Park, Dae Woong Ham, Jae-Sung Lee, Min-Ku Song, Han-Jun Lee
PURPOSE: To investigate whether cartilage thickness in the lateral femoral posterior condyle affects the femoral rotation angles on navigation and clinical outcomes of navigation-assisted total knee arthroplasty (TKA). METHODS: This is a prospective randomized study of navigation-assisted TKA. Fifty cases underwent TKA without removal of the lateral posterior femoral cartilage (Group 1), and 56 cases underwent TKA with removal of the lateral posterior femoral cartilage (Group 2)...
August 2, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28765605/the-potential-of-using-semitendinosus-tendon-as-autograft-in-rabbit-meniscus-reconstruction
#9
Chenxi Li, Xiaoqing Hu, Qingyang Meng, Xin Zhang, Jingxian Zhu, Linghui Dai, Jin Cheng, Mingjin Zhong, Weili Shi, Bo Ren, Jiying Zhang, Xin Fu, Xiaoning Duan, Yingfang Ao
Since transplantation of meniscal allograft or artificial menisci is limited by graft sources and a series of adverse events, substitution for meniscus reconstruction still needs to be explored. Natural biomaterials, which can provide a unique 3-D microenvironment, remain a promising alternative for tissue engineering. Among them, autograft is a preferred option for its safety and excellent biocompatibility. In this study, we utilized semitendinosus tendon autograft in meniscus reconstruction to investigate its fibrochondrogenic metaplasticity potential and chondroprotective effect...
August 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28765028/condylar-joint-fusion-and-stabilization-by-screws-plates-in-nontraumatic-atlanto-occipital-dislocation-aod-technical-report-of-two-cases
#10
Forhad H Chowdhury, Mohammod Raziul Haque, Sarwar Murshed Alam, Noman Khaled Chowdhury, Shamsul Islam Khan, Atul Goel
BACKGROUND: Nontraumatic spontaneous atlanto-occipital dislocation (AOD) is very rare. In this report, we discuss the technical steps of condylar joint fusion and stabilization (by screws & plates) in nontraumatic AOD. So far our knowledge it is probably the first report of such techniques. MATERIAL AND METHODS: A young girl and a young man with progressive quadriparesis due to non traumatic spontaneous atlanto-occipital dislocation were managed by microsurgical reduction, fusion and stabilization of the joint by occipital condylar and C1 lateral mass screw and plate fixation after mobilization of vertebral artery...
July 29, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28761278/unilateral-condylar-hyperplasia-a-genetic-link-case-reports
#11
Monika Mahajan
Unilateral condylar hyperplasia is an uncommon condition with unknown etiology which causes overdevelopment of condyle leading to facial asymmetry, mandibular deviation, malocclusion, and articulation dysfunction. Two Indian families with unilateral condylar hyperplasia are presented where the similar abnormality was also detected in one of their parents. The condylar hyperplasia in these two families indicates that mandibular condylar hyperplasia could be genetic in origin.
January 2017: National Journal of Maxillofacial Surgery
https://www.readbyqxmd.com/read/28760283/idiopathic-condylar-resorptions-3-dimensional-condylar-bony-deformation-signs-and-symptoms
#12
Kasper Dahl Kristensen, Bjarke Schmidt, Peter Stoustrup, Thomas Klit Pedersen
INTRODUCTION: Our aim was to describe 3-dimensional condylar deformation of the temporomandibular joint (TMJ) and symptoms and signs of temporomandibular dysfunction (TMD) in patients with idiopathic condylar resorption (ICR). METHODS: We included 25 patients with ICR and 25 controls. We performed cone-beam computed tomographic scans and analyzed condylar width, length, and height as well as the condylar axial angle and the condylar neck angle. TMJ cross sections were evaluated for degenerative characteristics and location of bony deformations...
August 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28759313/glycosylation-of-dmp1-is-essential-for-chondrogenesis-of-condylar-cartilage
#13
Y Weng, Y Liu, H Du, L Li, B Jing, Q Zhang, X Wang, Z Wang, Y Sun
The mandibular condylar cartilage (MCC) shoulders force for the subchondral bone during mastication. The cartilage matrix contains various large molecules, such as type I, II, and X collagens and proteoglycans (PGs), which jointly play essential roles in maintaining cartilage characteristics. PGs play key roles in maintaining the elasticity of cartilage and providing a cushion against mastication forces. In addition to the well-known PGs, DMP1-PG, which is the PG form of dentin matrix protein 1 (DMP1), is a newly identified PG...
July 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28757775/an-anatomical-study-of-the-proximal-aspect-of-the-medial-femoral-condyle-to-define-the-proximal-distal-condylar-length
#14
Chia-Ming Chang, Wen-Tien Wu, Kuan-Lin Liu, Kuang-Ting Yeh, Cheng-Huan Peng, Ing-Ho Chen
OBJECTIVE: Despite its possible role in knee arthroplasty, the proximal-distal condylar length (PDCL) of the femur has never been reported in the literature. We conducted an anatomic study of the proximal aspect of the medial femoral condyle to propose a method for measuring the PDCL. MATERIALS AND METHODS: Inspection of dried bone specimens was carried out to assure the most proximal condylar margin (MPCM) as the eligible starting point to measure the PDCL. Simulation surgery was performed on seven pairs of cadaveric knees to verify the clinical application of measuring the PDCL after locating the MPCM...
April 2017: Ci Ji Yi Xue za Zhi, Tzu-chi Medical Journal
https://www.readbyqxmd.com/read/28754877/hyperbaric-oxygen-protects-type-ii-collagen-in-interleukin-1%C3%AE-induced-mandibular-condylar-chondrocyte-via-inhibiting-the-jnk-c-jun-signaling-pathway
#15
Qi Sun, Gaoyi Wu, Hang Chen, Lei Chen, Hongyu Chen, Guoxiong Zhu, Huaqiang Zhao
The aim of this study was to explore the mechanisms of Hyperbaric oxygen (HBO) protective on interleukin-1β (IL-1β) induced rat's mandibular condylar chondrocytes. Chondrocytes were exposure to Hyperbaric oxygen after induced inflammatory by IL-1β. After that, the expression of p-JNK and c-Jun was increased significantly, while the Sox-9 was decreased significantly, Immunofluorescence results showed that the expression of p-JNK and p-c-Jun were decreased while the expression of Sox-9 and COL2 were increased in chondrocytes treated with IL-1β and selective JNK inhibitor...
July 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/28753397/lateral-meniscal-allograft-transplant-via-a-medial-approach-leads-to-less-extrusion
#16
Nam-Hong Choi, Jeong-Ki Choi, Bong-Seok Yang, Doe-Hyun Lee, Brian N Victoroff
BACKGROUND: Accurate positioning of the bony bridge is crucial to prevent extrusion of meniscal allografts after transplant. However, oblique or lateralized placement of the bony bridge of the lateral meniscal allograft may occur due to technical error or a limited visual field. The patellar tendon may be an obstacle to approaching the anterior horn of the lateral meniscus, resulting in a laterally placed allograft. Therefore, lateral meniscal transplant through a medial arthrotomy would be an alternative approach...
July 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28750725/hydroxyapatite-collagen-scaffold-with-autologous-bone-marrow-aspirate-for-mandibular-condylar-reconstruction
#17
Debraj Howlader, U Vignesh, Dichen P Bhutia, Rahul Pandey, Sumit Kumar, Tulika Chandra, Divya Mehrotra
PURPOSE: This study was designed with the aim to assess the efficiency of hydroxyapatite/collagen (HA/Col) bio-scaffold with bone marrow aspirate (BMA) to reconstruct mandibular condyle in patients with temporomandibular joint (TMJ) ankylosis. MATERIALS AND METHODS: Seven pediatric patients with TMJ ankylosis, who visited our outpatient clinic and whose parents opted for this procedure, were included in this study. After a history and clinical examination for TMJ movements, computed tomography (CT) scans were obtained...
July 6, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28749837/occlusion-guided-double-barreled-fibular-osteoseptocutaneous-free-flap-for-refined-mandibular-reconstruction-aided-by-virtual-surgical-planning
#18
Xingzhou Qu, Mingyi Wang, Liqun Xu, Jiannan Liu, Shizhu Bai, Chenping Zhang
BACKGROUND: There were many articles about double-barreled fibular flap for mandibular reconstruction. The upper layer bone was suit for implant placement as a new alveolar. The lower layer was necessary for contour. But the accurate relationship between the 2 layers bone was rarely reported. OBJECTIVES: The purpose of this study was twofold: to evaluate the feasibility of the novel design of the double-barreled fibular flap from virtual surgery to actual result; to evaluate the accuracy and results of occlusion-guided double-barreled fibular free flap in mandible reconstruction...
July 26, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28741321/-articular-fractures-of-the-distal-femur-comparative-analysis-of-three-surgical-treatments
#19
F Souki-Chmeit, E Zambrano-Sanguinetti, A Sandia-Briceño, A Souki-Chmeit, M Brito-Velásquez
INTRODUCTION: The distal articular femur fracture is a serious injury that for years has been a problem in traumatology. It is often believed that produced varying degrees of permanent disability in the knee and that the fate of the joint was determined by the injury rather than treatment. OBJECTIVES: Present the results of surgical treatment of articular distal femur fractures type C2 with three treatment modalities: dynamic condylar screw (TDC), condylar buttress plate (PSC) and periarticular plate (PPA)...
January 2017: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/28740266/reproducibility-of-centric-relation-techniques-by-means-of-condyle-position-analysis
#20
Nikolina Holen Galeković, Vesna Fugošić, Vedrana Braut, Robert Ćelić
PURPOSE: The aim of this study was to determine the reproducibility of clinical centric relation (CR) registration techniques (bimanual manipulation, chin point guidance and Roth's method) by means of condyle position analysis. MATERIAL AND METHODS: Thirty two fully dentate asymptomatic subjects (16 female and 16 male) with normal occlusal relations (Angle class I) participated in the study (mean age, 22.6 ± 4.7 years). The mandibular position indicator (MPI) was used to analyze the three-dimensional (anteroposterior (ΔX), superoinferior (ΔZ), mediolateral (ΔY)) condylar shift generated by the difference between the centric relation position (CR) and the maximal intercuspation position (MI) observed in dental arches...
March 2017: Acta Stomatologica Croatica
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