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https://www.readbyqxmd.com/read/29150695/new-angle-measurement-device-to-control-the-posterior-tibial-slope-angle-in-medial-opening-wedge-high-tibial-osteotomy
#1
Hiroyasu Ogawa, Kazu Matsumoto, Haruhiko Akiyama
INTRODUCTION: Medial opening wedge high tibial osteotomy has been associated with an unintentional increase in the posterior tibial slope angle. We aimed to evaluate the effectiveness of a novel bone spreader angle rod to maintain the native posterior tibial slope angle in medial opening wedge high tibial osteotomy. MATERIALS AND METHODS: Data from 92 consecutive knees in 83 patients who underwent medial opening wedge high tibial osteotomy for knee osteoarthritis between March 2015 and June 2016 were analysed...
November 17, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29149846/the-impact-of-bone-morphology-on-the-outcome-of-the-pivot-shift-test-a-cohort-study
#2
Thomas Branch, Shaun Stinton, Adrija Sharma, Frederic Lavoie, Christian Guier, Philippe Neyret
BACKGROUND: The presence of a positive pivot shift after surgical repair of the ACL is considered an important indicator of a failed reconstruction. The ability to predict the result of a pivot shift test after an ACL reconstruction using variables that can be measured prior to surgery could provide an indication of which patients may be at-risk of a poor surgical outcome.The purpose of this study was to determine whether structural characteristics of the femur and tibia, measured using plain radiographs, were associated with the result of the pivot shift test in unilateral ACL reconstructed patients...
November 17, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29146395/correlation-between-intraoperative-proximal-segment-rotation-and-post-sagittal-split-ramus-osteotomy-relapse-a-three-dimensional-cone-beam-computed-tomography-study
#3
B-J Choi, B-S Lee, Y-D Kwon, J-W Lee, S-U Yun, K-S Ryu, J-Y Ohe
This study evaluated the effects of proximal segment rotation and the extent of mandibular setback on post-sagittal split ramus osteotomy (SSRO) relapse using three-dimensional (3D) analysis. Thirty-one patients diagnosed with a skeletal class III malocclusion who underwent SSRO alone were enrolled in this study. The movements of the mandibular condyles were assessed using cone beam computed tomography (CBCT) and a 3D imaging program at ≤1 month before the operation (T0), 1 week after the operation (T1), and 6 months (T2) and 1year (T3) postoperative...
November 13, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29145286/bilateral-discoid-medial-meniscus-associated-with-meniscal-tears-and-hypoplasia-of-the-medial-femoral-condyle-a-case-report
#4
Hong-De Wang, Shi-Jun Gao
RATIONALE: Bilateral discoid medial menisci is an extremely rare abnormality of the knee joint. The presence of a discoid medial meniscus has been associated with magnetic resonance imaging (MRI) and radiographic changes in the tibial region, such as cupping of the medial tibial plateau and tibial physis collapse. While discoid medial meniscal tears with hypoplasia of the femoral medial condyles have not been previously reported. Herein, we report a case of bilateral discoid medial menisci associated with meniscal tears and femoral bone changes...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29142872/isolated-tympanic-plate-fracture-detected-by-cone-beam-computed-tomography-report-of-four-cases-with-review-of-literature
#5
Ashita Ritesh Kalaskar, Ritesh Kalaskar
The tympanic plate is a small part of the temporal bone that separates the mandibular condyle from the external auditory canal. Fracture of this small plate is rare and usually associated with other bony fractures, mainly temporal and mandibular bone. There is a limited amount of literature on this subject, which increases the chance of cases being overlooked by physicians and radiologists. This is further supported by purely isolated cases of tympanic plate fracture without evidence of other bony fractures...
October 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/29142870/intracorporeal-reduction-of-condylar-fracture-using-both-pedicled-condylar-and-seperated-ramal-fragments-after-vertical-ramal-osteotomy
#6
Il-Kyu Kim, Jun-Min Jang, Hyun-Young Cho, Ji-Hoon Seo, Dong-Hwan Lee
The aim of this study is to introduce a surgical technique that can maintain blood supply to prevent condylar resorption in the extracorporeal reduction of condylar fracture. Neither the medial pterygoid muscle on the ramal bone nor the lateral pterygoid muscle on the condylar fragment was detached after vertical ramal osteotomy. Thus, reduction was performed in the intracorporeal state. Therefore, blood supply was expected to be maintained to the fragments of both the condylar and ramal bones. On postoperative radiographs, the anatomical outline of the fractured condyle was well restored, and the occlusion was stable...
October 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/29142869/temporomandibular-joint-synovial-chondromatosis-extending-to-the-temporal-bone-a-report-of-two-cases
#7
Dae-Hoon Kim, Eun Hee Lee, Eunae Sandra Cho, Jae-Young Kim, Kug-Jin Jeon, Jin Kim, Jong-Ki Huh
Synovial chondromatosis is a rare benign lesion originating from the synovial membrane. It presents as adhesive or non-adhesive intra-articular cartilaginous loose bodies. Although the causes of synovial chondromatosis have not been fully elucidated, inflammation, external injury, or excessive use of joints have been suggested as possible causes. Synovial chondromatosis has been reported to occur most frequently at large joints that bear weights, with a rare occurrence at the temporomandibular joint (TMJ). When synovial chondromatosis develops at TMJ, clinical symptoms, including pain, joint sounds, and mouth opening may common...
October 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/29142868/protrusive-maxillomandibular-fixation-for-intracapsular-condylar-fracture-a-report-of-two-cases
#8
Yeong Kon Jeong, Won-Jong Park, Il Kyung Park, Gi Tae Kim, Eun Joo Choi
Clinical limitations following closed reduction of an intracapsular condylar fracture include a decrease in maximum mouth opening, reduced range of mandibular movements such as protrusion/lateral excursion, and reduced occlusal stability. Anteromedial and inferior displacement of the medial condyle fragment by traction of the lateral pterygoid muscle can induce bone overgrowth due to distraction osteogenesis between the medial and lateral condylar fragments, causing structural changes in the condyle. In addition, when conventional maxillomandibular fixation (MMF) is performed, persistent interdental contact sustains masticatory muscle hyperactivity, leading to a decreased vertical dimension and premature contact of the posterior teeth...
October 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/29141673/a-customized-fixation-plate-with-novel-structure-designed-by-topological-optimization-for-mandibular-angle-fracture-based-on-finite-element-analysis
#9
Yun-Feng Liu, Ying-Ying Fan, Xian-Feng Jiang, Dale A Baur
BACKGROUND: The purpose of this study was to design a customized fixation plate for mandibular angle fracture using topological optimization based on the biomechanical properties of the two conventional fixation systems, and compare the results of stress, strain and displacement distributions calculated by finite element analysis (FEA). METHODS: A three-dimensional (3D) virtual mandible was reconstructed from CT images with a mimic angle fracture and a 1 mm gap between two bone segments, and then a FEA model, including volume mesh with inhomogeneous bone material properties, three loading conditions and constraints (muscles and condyles), was created to design a customized plate using topological optimization method, then the shape of the plate was referenced from the stress concentrated area on an initial part created from thickened bone surface for optimal calculation, and then the plate was formulated as "V" pattern according to dimensions of standard mini-plate finally...
November 15, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29141669/metastasis-in-the-mandibular-condyle-a-case-report
#10
Mina Dodo, Masahiro Kumagai, Yuta Kato, Hisashi Hirakawa, Takeyoshi Koseki
BACKGROUND: Most bone metastases are observed in the trunk of the body. Metastasis in the mandibular condyle is rare. In many case reports, temporary common temporomandibular joint disorder-like symptoms can be a sign of relapse and metastasis. CASE PRESENTATION: We report a rare case of breast carcinoma metastatic to the left mandibular condyle in a 55-year-old Japanese woman, who visited our department for a dental check-up prior to chemotherapy. She had almost no symptoms, but radiographs suggested the existence of metastasis...
November 16, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/29140580/enhanced-biological-fixation-of-ligaments-to-bone-tissues-utilizing-chitin-fabrics
#11
Hisaya Nomata, Michiko Nakaishi, Kazuo Takakuda
In ligament reconstruction involving anterior cruciate ligament surgery, biological fixation between the transferred ligament and bone tissue is critical for achieving successful outcomes. Here, we administered chitin fabrics into the bone tunnels and evaluated their efficacy in promoting biological fixation. An animal model on the rat's patellar ligament was employed. First, bone tunnels were created in the lateral condyle of the femur. The ligament was then separated from the tibial tuberosity, and half was inserted into the tunnel and fixed with the use of end button...
November 15, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29134239/temporomandibular-joint-atlas-for-detection-and-grading-of-juvenile-idiopathic-arthritis-involvement-by-magnetic-resonance-imaging
#12
Christian J Kellenberger, Thitiporn Junhasavasdikul, Mirkamal Tolend, Andrea S Doria
Contrast-enhanced magnetic resonance imaging (MRI) is considered the diagnostic standard for identifying involvement of the temporomandibular joint by juvenile idiopathic arthritis. Early or active arthritis is shown as bone marrow oedema, joint effusion, synovial thickening and increased joint enhancement. Subsequent joint damage includes characteristic deformity of the mandibular condyle, bone erosion, disk abnormalities and short mandibular ramus due to impaired growth. In this pictorial essay, we illustrate normal MRI findings and growth-related changes of the temporomandibular joint in children...
November 13, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/29133198/study-of-the-mechanical-reliability-of-an-s-shaped-adjustable-osteosynthesis-plate-for-bilateral-sagittal-split-osteotomies-study-on-15-consecutive-cases
#13
Alexis Veyssiere, Nicols Leprovost, Béatrice Ambroise, Raphaelle Prévost, Anne Chatellier, Hervé Bénateau
INTRODUCTION: The main challenge during the osteosynthesis of a bilateral sagittal split osteotomy (BSSO) is to take into account the correct position of the condyle. Adjustable plates can be used to fine-tune the final occlusion without changing the osteosynthesis. A new type of adjustable plate is presented in this article. The aim is to assess the mechanical reliability of this system during the surgery and during the healing period, thanks to a preliminary prospective on 15 consecutive cases...
November 10, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29132902/histopathological-assessment-of-primary-osteoarthritic-knees-in-large-patient-cohort-reveal-the-possibility-of-several-potential-patterns-of-osteoarthritis-initiation
#14
V P Mantripragada, N S Piuzzi, T Zachos, N A Obuchowski, G F Muschler, R J Midura
OBJECTIVE: The two main objectives of the study include (1) Test the hypothesis that the lateral femoral condyle (LFC) in patients with primary OA and varus knees undergoing total knee arthroplasty (TKA) can be used as a model to better characterize varying histological features of human OA, (2) Correlate characteristic OA features using the established histopathological scoring systems (HHGS and OARSI) to understand potential histopathological patterns of OA initiation. DESIGN: Two osteochondral specimens (4×4×8mm) were collected from fifty patient's LFC at the time of TKA (total 100 specimens), who presented preserved lateral knee compartment with joint space width>2mm...
November 10, 2017: Current Research in Translational Medicine
https://www.readbyqxmd.com/read/29132383/an-unusually-large-osteochondroma-of-the-mandibular-angle-a-case-report
#15
Ryosuke Abe, Ikuya Miyamoto, Hirotaka Sato, Daishi Saitou, Genki Yamaya, Hiroyuki Yamada
BACKGROUND: Osteochondroma is a benign bone tumor that can occur in both the mesenchymal and craniofacial bones. However, craniofacial osteochondromas are extremely rare, because the mandible develops by intramembranous ossification rather than by endochondral ossification. CASE PRESENTATION: The most common site of craniofacial osteochondroma is the mandibular condyle, followed by the coronoid process. In the present study, we have described the case of a 64-year-old Japanese man with an unusually large osteochondroma located on the internal angle of the mandibular body...
November 13, 2017: World Journal of Surgical Oncology
https://www.readbyqxmd.com/read/29132335/topical-zoledronic-acid-decreases-micromotion-induced-bone-resorption-in-a-sheep-arthroplasty-model
#16
Thomas Jakobsen, Søren Kold, Juan Shiguetomi-Medina, Jorgen Baas, Kjeld Soballe, Ole Rahbek
BACKGROUND: Initial micromotion of a total hip replacement is associated with aseptic loosening. The use of bisphosphonates could be one way to reduce peri-implant bone resorption induced by micromotion. Bisphosphonates compounds are inhibitors of bone resorption. The aim of this study was to investigate whether local treatment with bisphosphonate would reduce bone resorption and fibrous tissue around an experimental implant subjected to micromotion. METHODS: One micromotion implant were inserted into each medial femoral condyle in ten sheep...
November 13, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29132099/tribological-properties-of-pva-pvp-blend-hydrogels-against-articular-cartilage
#17
Yusuf Kanca, Piers Milner, Daniele Dini, Andrew A Amis
This research investigated in-vitro tribological performance of the articulation of cartilage-on- polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP) blend hydrogels using a custom-designed multi-directional wear rig. The hydrogels were prepared by repeated freezing-thawing cycles at different concentrations and PVA to PVP fractions at a given concentration. PVA/PVP blend hydrogels showed low coefficient of friction (COF) values (between 0.12 ± 0.01 and 0.14 ± 0.02) which were closer to the cartilage-on-cartilage articulation (0...
October 25, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29130879/vascularized-medial-femoral-condyle-graft-for-manubrium-nonunion-case-report-and-review-of-the-literature
#18
William R Aibinder, Michael E Torchia, Allen T Bishop, Alexander Y Shin
Fractures of the sternum are rare. Persistent nonunions, however, can lead to chronic pain and significant functional limitations. The vascularized medial femoral condyle is a versatile tool in the surgeon's armamentarium. Traditionally, it has been used as a thin corticoperiosteal graft in the treatment of nonunion of tubular bones. Its use as a structural corticocancellous graft has also been expanding. This report presents a case of a patient with a recalcitrant symptomatic nonunion of the manubrium treated with the unique combined corticoperiosteal and corticocancellous vascularized bone graft from the medial femoral condyle and reviews the literature concerning these uncommon nonunions...
October 2017: Journal of Surgical Orthopaedic Advances
https://www.readbyqxmd.com/read/29128876/internal-femoral-component-malrotation-in-tka-significantly-alters-tibiofemoral-kinematics
#19
Thomas J Heyse, Bilal F El-Zayat, Ronny De Corte, Yan Chevalier, Susanne Fuchs-Winkelmann, Luc Labey
PURPOSE: Femoral component malrotation in total knee arthroplasty (TKA) is clinically proven to cause dissatisfaction and impaired function. This study is an attempt to characterize the tibiofemoral kinematics following femoral malrotation in posterior stabilized (PS) TKA. It was hypothesized that internal malrotation would introduce the most pronounced changes. METHODS: Six fresh-frozen cadaver specimens were mounted in a kinematic rig. Three motion patterns were applied with the native knee and following PS TKA (passive motion, open chain extension, and squatting) while infrared cameras recorded the trajectories of markers attached to femur and tibia...
November 11, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29127775/four-dimensional-computed-tomography-evaluation-of-condylar-movement-in-a-patient-with-temporomandibular-joint-osteoarthritis
#20
Masaya Akashi, Takumi Hasegawa, Satoru Takahashi, Takahide Komori
Temporomandibular joint (TMJ) osteoarthritis (OA) is a disease of the bone, cartilage, and supporting tissues of the joint. Patients with advanced TMJ-OA often have symptoms such as pain, swelling, and joint dysfunction, and they sometimes require surgical intervention when conservative treatment is not effective. The etiology of TMJ-OA remains elusive. The usefulness of 4-dimensional (4D) computed tomography (CT) in motion analysis of various joints has recently been reported. This article introduces a novel imaging technique of 4D CT that aims to identify kinematic features that may be associated with the etiology of TMJ-OA...
October 16, 2017: Journal of Oral and Maxillofacial Surgery
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