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https://www.readbyqxmd.com/read/28337656/what-factors-are-associated-with-femoral-component-internal-rotation-in-tka-using-the-gap-balancing-technique
#1
Seung-Yup Lee, Hong-Chul Lim, Ki-Mo Jang, Ji-Hoon Bae
BACKGROUND: When using the gap-balancing technique for TKA, excessive medial release and varus proximal tibial resection can be associated with internal rotation of the femoral component. Previous studies have evaluated the causes of femoral component rotational alignment with a separate factor analysis using unadjusted statistical methods, which might result in treatment effects being attributed to confounding variables. QUESTIONS/PURPOSES: (1) What pre- and intraoperative factors are associated with internal rotation of the femoral component in TKA using the gap balancing technique? (2) To what degree does femoral component rotation as defined by the navigation system differ from rotation as measured by postoperative CT? METHODS: Three hundred seventy-seven knees that underwent computer-assisted primary TKA attributable to degenerative osteoarthritis with varus or mild valgus alignment in which medial soft tissue release was performed, and those with preoperative radiographs including preoperative CT between October 2007 and June 2014 were included in the study...
March 23, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28337262/osteopontin-stimulates-matrix-metalloproteinase-expression-through-the-nuclear-factor-%C3%AE%C2%BAb-signaling-pathway-in-rat-temporomandibular-joint-and-condylar-chondrocytes
#2
Feng Ding, Jing Wang, Guoxiong Zhu, Huaqiang Zhao, Gaoyi Wu, Lei Chen
BACKGROUND: To examine the possible regulatory mechanisms of osteopontin (OPN) and the nuclear factor-κB (NF-κB) signaling pathway in the temporomandibular joint (TMJ) of rats subjected to chronic sleep deprivation (CSD). METHODS: Rats were subjected to CSD using the modified multiple platform method. The histomorphology of the TMJ was observed by hematoxylin-eosin staining. OPN and NF-κB/p65 expression were detected by immunohistochemical and immunofluorescence staining together with western blotting...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28330922/joint-histology-in-alligator-mississippiensis-challenges-the-identification-of-synovial-joints-in-fossil-archosaurs-and-inferences-of-cranial-kinesis
#3
Alida M Bailleul, Casey M Holliday
Archosaurs, like all vertebrates, have different types of joints that allow or restrict cranial kinesis, such as synovial joints and fibrous joints. In general, synovial joints are more kinetic than fibrous joints, because the former possess a fluid-filled cavity and articular cartilage that facilitate movement. Even though there is a considerable lack of data on the microstructure and the structure-function relationships in the joints of extant archosaurs, many functional inferences of cranial kinesis in fossil archosaurs have hinged on the assumption that elongated condylar joints are (i) synovial and/or (ii) kinetic...
March 29, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28330756/femoral-articular-geometry-and-patellofemoral-stability
#4
Farhad Iranpour, Azhar M Merican, Seow Hui Teo, Justin P Cobb, Andrew A Amis
BACKGROUND: Patellofemoral instability is a major cause of anterior knee pain. The aim of this study was to examine how the medial and lateral stability of the patellofemoral joint in the normal knee changes with knee flexion and measure its relationship to differences in femoral trochlear geometry. METHODS: Twelve fresh-frozen cadaveric knees were used. Five components of the quadriceps and the iliotibial band were loaded physiologically with 175N and 30N, respectively...
March 19, 2017: Knee
https://www.readbyqxmd.com/read/28326983/morphologic-and-morphometric-description-of-the-temporomandibular-joint-in-the-domestic-dog-using-computed-tomography
#5
Lenin A Villamizar-Martinez, Cristian M Villegas, Marco A Gioso, Alexander M Reiter, Geni C Patricio, Ana C Pinto
The temporomandibular joint (TMJ) in the domestic dog is a synovial joint with 2 articular surfaces, the mandibular fossa of the squamous portion of the temporal bone and the articular head of the condylar process of the mandible. Although different diagnostic imaging techniques have been used to study the TMJ in dogs, morphologic and morphometric studies based on computed tomography (CT) are scarce. The purpose of the present study was to describe the morphologic and morphometric features of the TMJ in domestic dogs using CT...
June 2016: Journal of Veterinary Dentistry
https://www.readbyqxmd.com/read/28326709/-cone-beam-computed-tomography-analysis-of-the-bony-structure-of-the-temporomandibular-joint-during-two-phase-treatment-with-herbst-appliance
#6
Chen Weiwei, Sang Ting, Huang Zhen, Wu Jun
OBJECTIVE: This study assessed the effects of two-phase treatment with Herbst appliance on the bony structure of the temporomandibular joint via cone beam computed tomography (CBCT) analysis. METHODS: This study selected 15 patients exhibiting early permanent dentition and classⅡmalocclusion combined with mandibular retrusion treated by a two phase treatment (Herbst and fixed appliance). The CBCT scans of the patients were obtained at the following stages: 2 weeks before Herbst treatment (T1), at the start of treatment when the Herbst appliance was set in place (T2), immediately after removal of the Herbst appliance (T3), and immediately after removal of the edgewise appliance (T4)...
October 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28326704/-extramedullary-fixation-combined-with-intramedullary-fixation-in-the-surgical-reduction-of-sagittal-mandibular-condylar-fractures
#7
Chen Chuanjun, Chen Xiaoyang, Chen Jing
OBJECTIVE: This study aimed to evaluate the clinical effect of extramedullary fixation combined with intramedullary fixation during the surgical reduction of sagittal mandibular condylar fractures. METHODS: Twenty-four sagittal fractures of the mandibular condyle in18 patients were fixed by two appliances: intramedullary with one long-screw osteosynthesis or Kirschner wire and extramedullary with one micro-plate. The radiologically-recorded post-operative stability-associated com-plications included the screw/micro-plate loosening, micro-plate twisting, micro-plate fractures, and fragment rotation...
October 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28326423/removing-a-well-fixed-femoral-sleeve-during-revision-total-knee-arthroplasty
#8
J Ryan Martin, Tyler S Watters, Daniel L Levy, Jason M Jennings, Douglas A Dennis
The following surgical technique describes a case of a 51-year-old man with severe juvenile rheumatoid arthritis that required a 2-stage revision of an infected revision total knee implant. The patient had previously been implanted with a revision rotating platform, constrained condylar device which gained excellent fixation through the use of diaphyseal-engaging stems, and a well-ingrown, fully porous-coated femoral metaphyseal sleeve. To avoid intraoperative complications while removing the femoral sleeve, a novel technique for femoral sleeve extraction was used...
December 2016: Arthroplasty Today
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
#9
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/28318168/-research-progress-of-mechanism-of-hypoxia-inducible-factor-1%C3%AE-signaling-pathway-in-condylar-cartilage-growth-and-remodeling
#10
Xu Gaoli, Wu Lili, Wu Zhiwu, Gu Zhiyuan
The condylar cartilage was adapted to hypoxic conditions in vivo. However, condylar cartilage cells exposed in normoxia in vitro affect the chondrocyte phenotype and cartilage matrix formation. This condition also resulted in great difficulty in chondrocyte research. Culturing chondrocyte should be simulated in in vivo hypoxia environment as much as possible. The hypoxia-inducible factor-1α (HIF-1α) demonstrates an important transcription factor of adaptive response to hypoxic conditions. HIF-1α also plays an active role in maintaining homeostasis and function of chondrocytes...
December 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28318167/-changes-in-ultrastructure-and-bone-morphogenetic-protein-expression-in-reconstructed-mandibular-condylar-cartilage-under-continuous-mandibular-advancement-in-adult-rats
#11
Yang Shuai, Li Xue, Gao Jie, Cai Yizhi, Li Ronghui, Wang Mingguo
OBJECTIVE: This study investigated the reconstructed mandibular condylar cartilage and the ultrastructural variations in mandibular condylar cartilage in adult rats as a result of mandibular advancement. METHODS: Thirty 9-week-old male Sprague-Dawley rats were randomly divided into experimental and control groups. Rats in the experimental group were subjected to mandibular advancement. Rats were sacrificed on days 3, 7, 14, 21, 30. Sections were cut from condyles, and bone morphogenetic protein-2 (BMP-2) expression in condylar cartilage was examined through immunohistochemical analysis...
December 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28318159/-meta-analysis-of-the-condylar-position-changes-produced-by-functional-appliances-in-class-%C3%A2-malocclusion
#12
Huang Xinqi, Cen Xiao, Liu Jun
OBJECTIVE: This study aimed to analyze the condylar position changes produced by functional appliances in class Ⅱ malocclusion by systematic review. METHODS: Electronic search was conducted using Chinese Biomedical Literature Database, China National Knowledge Infrastructure, VIP Database for Chinese Technical Periodicals, Medline, Embase, Pubmed, and Cochrane Central Register of Controlled Trials. Studies on condylar position changes produced by functional appliances in class Ⅱ malocclusion were included...
December 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28315965/evaluation-of-oral-manifestations-of-patients-with-mucopolysaccharidosis-iv-and-vi-clinical-and-imaging-study
#13
Renata Quirino de Almeida-Barros, Paula Frassinetti Vasconcelos de Medeiros, Marcella Quirino de Almeida Azevedo, Adriana de Oliveira Lira Ortega, Angela Toshie Araki Yamamoto, Sheyla Kátia Lúcio Dornelas, Patrícia Meira Bento
OBJECTIVE: The aim of this study is to assess oral manifestations in patients with mucopolysaccharidosis IV (MPS IVA) and mucopolysaccharidosis VI (MPS VI). MATERIALS AND METHODS: Seventeen patients were assessed, nine with MPS IVA and eight with MPS VI, treated at the Medical Genetics Outpatient Clinic of Hospital Universitário Alcides Carneiro (HUAC) in Campina Grande, Paraíba State, Brazil. Assessments included clinical and intraoral examinations, analysis of occlusal function, and panoramic X-rays...
March 19, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28303737/three-dimensional-mandibular-motion-in-skeletal-class-iii-patients
#14
Alessandro Ugolini, Andrea Mapelli, Marzia Segù, Matteo Zago, Marina Codari, Chiarella Sforza
OBJECTIVE: The aim of the study was to analyze the characteristics and changes in mandibular condylar motion in patients with skeletal Class III malocclusion. METHODS: Using a 3D motion analyzer, mandibular movements were recorded in 9 patients with skeletal Class III malocclusion and 22 control subjects with Angle Class I jaw relationships. RESULTS: Class III patients had a similar interincisor point displacement but a significantly reduced displacement of both condyles on the sagittal and frontal planes, with smaller translation paths than control subjects (right -9...
March 17, 2017: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/28300494/three-dimensional-morphological-characterization-of-malocclusions-with-mandibular-lateral-displacement-using-cone-beam-computed-tomography
#15
Roberto L Velásquez, Jorge C Coro, Alejandra Londoño, Susan P McGorray, Timothy T Wheeler, Sadao Sato
OBJECTIVE: The purpose of this study was to evaluate the morphologic characteristics of MLD malocclusions using 3D imaging. MATERIALS AND METHODS: MLD characteristics were examined using CBCT data in 40 subjects. A 3D Cephalometric analysis was developed to describe the spatial position of the mandible and temporal bones. RESULTS: Vertical dental heights were shorter and the posterior occlusal plane (POP) presented a steeper sagittal inclination on the shifted side (the side of the laterally displaced bony chin) than on the contralateral side...
March 16, 2017: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/28299431/changes-of-posterior-condylar-offset-results-in-midflexion-instability-in-single-radius-total-knee-arthroplasty
#16
Georg Matziolis, Steffen Brodt, Christoph Windisch, Eric Roehner
INTRODUCTION: There is no algorithm for the management of joint stability in midflexion up to now. Change in the joint line (JL) is considered to be the primary cause, although it only determines the extension gap. The purpose of this study was to determine the influence of the posterior condylar offsets (PCO), which defines the flexion gap, on midflexion instability. MATERIALS AND METHODS: Forty-two knee joints (38 patients) were included in this study, patients undergoing navigated total knee arthroplasty due to primary osteoarthritis of the knee...
March 16, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28299280/simple-bone-cyst-of-the-mandibular-condyle
#17
Benjamin H J Rapaport, Andrew A C Heggie
Simple bone cysts (SBCs) are benign lesions often found in the long bones of children between their first and second decades. They occasionally occur in the mandible but rarely in the mandibular condyle. A case of a 7-year-old female child with an increasing enlargement of the left mandibular condyle is presented. A 2 cm × 3 cm lytic lesion was explored and curetted through an intraoral vestibular incision and proved to be an SBC. Postoperative recovery was uncomplicated with remodeling of the condylar observed at 3 years follow-up...
July 2016: Annals of Maxillofacial Surgery
https://www.readbyqxmd.com/read/28298998/condylar-intramedullary-intraosseous-lipoma-contribution-of-a-new-case-and-review-of-the-literature
#18
Alba Sanjuan, Alicia Dean, Blas Garcia, Francisco Alamillos, Elisa Roldan, Antonio Blanco
BACKGROUND: Lipoma is the most common benign tumour of the human body, being intraosseous involvement very rare. Just 1 to 4% of all cases of lipoma are located in the oral cavity, only 0.1% being intraosseous. The jaw is its most uncommon bone location. Etiology of intraosseous lipoma (IOL) is unknown, although several theories have been proposed. Usually asymptomatic, the symptoms, when present, will depend on its location and size. Its origin may be intraosseous or juxtacortical. A biopsy is essential for diagnosis, and definitive treatment involves resection or curettage of the lesion...
March 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28296040/maxillofacial-trauma-patterns-associated-with-external-auditory-canal-fractures-cone-beam-computed-tomography-analysis
#19
Ibrahim K Ali, Kaustubh Sansare, Freny R Karjodkar, Prashant Salve, Kavita Vanga, Ajinkya M Pawar
BACKGROUND/ AIMS: There is a paucity of literature on EAC fractures secondary to maxillofacial trauma, with most of the literature on EAC fractures consisting of isolated case reports. To the authors' best knowledge, this is the first study to use Cone Beam Computed Tomography to evaluate the EAC region. The aim of this study was to assess the prevalence of external auditory canal (EAC) fracture following maxillofacial trauma and to evaluate the association between EAC fracture and other maxillofacial fractures and the region of trauma...
March 15, 2017: Dental Traumatology: Official Publication of International Association for Dental Traumatology
https://www.readbyqxmd.com/read/28293922/highly-variable-femoral-morphology-in-osteoarthritic-chinese-are-prostheses-today-sufficiently-suitable
#20
Yunjie Zhang, Xiaofeng Wang, Zongming Wu, Qing Xia, Yunchao Shao
Background We aimed to retrospectively investigate the morphology of the resected surfaces of femurs in Chinese patients who underwent total knee arthroplasty (TKA) and to assess the suitability of contemporary femoral components. Methods Measurements on three-dimensional reconstruction after virtual bone cutting were performed on 142 knees from Chinese TKA candidates. The anteroposterior (AP) and mediolateral (ML) dimensions, aspect ratio (ML/AP), and posterior condylar angle (PCA) were measured in the axial plane; the height and length of medial and lateral anterior condyles and the maximal width of the anterior condyles were measured in the frontal plane...
March 14, 2017: Journal of Knee Surgery
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