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https://www.readbyqxmd.com/read/28077395/the-effects-of-posterior-cruciate-ligament-deficiency-on-posterolateral-corner-structures-under-gait-and-squat-loading-conditions-a-computational-knee-model
#1
K-T Kang, Y-G Koh, M Jung, J-H Nam, J Son, Y H Lee, S-J Kim, S-H Kim
OBJECTIVES: The aim of the current study was to analyse the effects of posterior cruciate ligament (PCL) deficiency on forces of the posterolateral corner structure and on tibiofemoral (TF) and patellofemoral (PF) contact force under dynamic-loading conditions. METHODS: A subject-specific knee model was validated using a passive flexion experiment, electromyography data, muscle activation, and previous experimental studies. The simulation was performed on the musculoskeletal models with and without PCL deficiency using a novel force-dependent kinematics method under gait- and squat-loading conditions, followed by probabilistic analysis for material uncertain to be considered...
January 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28054459/a-new-species-of-the-giant-deep-sea-isopod-genus-bathynomus-a-milne-edwards-1879-crustacea-isopoda-cirolanidae-from-hainan-island-south-china-sea
#2
Qi Kou, Jun Chen, Xinzheng Li, Lisheng He, Yong Wang
Several specimens of the giant deep-sea isopod genus Bathynomus were collected by a deep-sea lander at a depth of 898 m from Hainan Island, northern South China Sea. After careful examination, this material and the specimens collected from Gulf of Aden, north-western Indian Ocean, previously reported as Bathynomus sp., were identified to be the same as a new species to the genus. Bathynomus jamesi sp. nov. can be distinguished from the congeners by the distal margin of pleotelson with 11 or 13 short straight spines and central spine not bifid; uropodal endopod and exopod with distolateral corner slightly pronounced; clypeus with lateral margins concave; and antennal flagellum extending when extended posteriorly reaches the pereonite 3...
January 5, 2017: Integrative Zoology
https://www.readbyqxmd.com/read/28050573/relationship-between-the-middle-genicular-artery-and-the-posterior-structures-of-the-knee-a-cadaveric-study
#3
Rogério Teixeira de Carvalho, Leonardo Addêo Ramos, João Victor Novaretti, Leandro Masini Ribeiro, Paulo Roberto de Queiroz Szeles, Sheila Jean McNeill Ingham, Rene Jorge Abdalla
BACKGROUND: The middle genicular artery (MGA) is responsible for the blood supply to the cruciate ligaments and synovial tissue. Traumatic sports injuries and surgical procedures (open and arthroscopic) can cause vascular damage. Little attention has been devoted to establish safe parameters for the MGA. PURPOSE: To investigate the anatomy of the MGA and its relation to the posterior structures of the knees, mainly the posterior capsule and femoral condyles, and to establish safe parameters to avoid harming the MGA...
December 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/27984448/novel-spiked-washer-repair-is-biomechanically-superior-to-suture-and-bone-tunnels-for-arcuate-fracture-repair
#4
Saman Vojdani, Laviel Fernandez, Jian Jiao, Tyler Enders, Steven Ortiz, Liangjun Lin, Yi-Xian Qin, David E Komatsu, James Penna, Charles J Ruotolo
OBJECTIVES: Injuries to the posterolateral corner (PLC) of the knee can lead to chronic degenerative changes, external rotation instability, and varus instability if not repaired adequately. A proximal fibula avulsion fracture, referred to as an arcuate fracture, has been described in the literature, but a definitive repair technique has yet to be described. The objective of this study is to present a novel arcuate fracture repair technique, utilizing a spiked-washer with an intramedullary screw, and to compare its biomechanical integrity to a previously described suture and bone tunnel method...
November 16, 2016: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/27774441/changes-of-lip-morphology-following-mandibular-setback-surgery-using-3d-cone-beam-computed-tomography-images
#5
Seung Jae Paek, Ji Yong Yoo, Jang Won Lee, Won-Jong Park, Young Deok Chee, Moon Gi Choi, Eun Joo Choi, Kyung-Hwan Kwon
BACKGROUND: The aims of this study are to evaluate the lip morphology and change of lip commissure after mandibular setback surgery (MSS) for class III patients and analyze association between the amount of mandibular setback and change of lip morphology. METHODS: The samples consisted of 14 class III patients treated with MSS using bilateral sagittal split ramus osteotomy. Lateral cephalogram and cone-beam CT were taken before and about 6 months after MSS. Changes in landmarks and variables were measured with 3D software program Ondemand™...
December 2016: Maxillofacial Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/27703824/spontaneous-recurrent-hemarthrosis-of-the-knee-a-report-of-two-cases-with-a-source-of-bleeding-detected-during-arthroscopic-surgery-of-the-knee-joint
#6
Eisuke Nomura, Hisatada Hiraoka, Hiroya Sakai
We report two cases of the spontaneous recurrent hemarthrosis of the knee. In these cases lateral meniscus was severely torn and a small tubular soft tissue with pulsation was identified on the synovium in the posterolateral corner during arthroscopic surgery of the knee joint. Gentle grasping of this tissue by forceps led to pulsating bleeding, which stopped by electrocoagulation. This soft tissue was considered a source of bleeding, since no recurrence of hemarthrosis was observed for more than four years after surgery...
2016: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/27685766/the-hoop-plate-for-posterior-bicondylar-shear-tibial-plateau-fractures-description-of-a-new-surgical-technique
#7
Vincenzo Giordano, Joseph Schatzker, Mauricio Kfuri
High-energy fractures of the proximal tibia with extensive fragmentation of the posterior rim of the tibial plateau are challenging. This technique aims to describe a method on how to embrace the posterior rim of the tibial plateau by placing a horizontal precontoured one-third tubular plate wrapped around its corners. This method, which we named "hoop plating," is mainly indicated for cases of crushed juxta-articular rim fractures, aiming to restore cortical containment of the tibial plateau. Through a lateral approach with a fibular head osteotomy (Lobenhoffer approach), both anterolateral and posterolateral fragments are directly reduced and supported by a one-third tubular plate of adequate length...
September 29, 2016: Journal of Knee Surgery
https://www.readbyqxmd.com/read/27671286/popliteus-impingement-after-tka-may-occur-with-well-sized-prostheses
#8
Michel P Bonnin, Arnoud de Kok, Matthias Verstraete, Tom Van Hoof, Catherine Van der Straten, Mo Saffarini, Jan Victor
PURPOSE: To determine the mechanisms and extents of popliteus impingements before and after TKA and to investigate the influence of implant sizing. The hypotheses were that (1) popliteus impingements after TKA may occur at both the tibia and the femur, and (2) even with an apparently well-sized prosthesis, popliteal tracking during knee flexion is modified compared to the preoperative situation. METHODS: The location of the popliteus in three cadaver knees was measured using computed tomography, before and after implantation of plastic TKA replicas, by injecting the tendon with radiopaque liquid...
September 26, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27620470/morphology-of-the-fibular-insertion-of-the-posterolateral-corner-and-biceps-femoris-tendon
#9
Hirotaka Takahashi, Goro Tajima, Shuhei Kikuchi, Jun Yan, Yoichi Kamei, Moritaka Maruyama, Atsushi Sugawara, Takaaki Saigo, Minoru Doita
PURPOSE: To clarify the fibular head insertion of the fibular collateral ligament (FCL), popliteofibular ligament (PFL), and biceps femoris tendon and related osseous landmarks on three-dimensional (3-D) images. METHODS: Twenty-one non-paired, formalin-fixed human cadaveric knees were evaluated in this study. The fibular head insertions of the FCL, PFL and biceps femoris tendon were identified and marked. 3-D images were created, and the surface area, location, positional relationships, and morphology of the fibular insertions of the FCL, PFL, and biceps femoris tendon and related osseous structures were analysed...
September 12, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27551233/a-new-species-of-monocheres-stock-copepoda-siphonostomatoida-asterocheridae-from-shallow-waters-off-florida-usa-an-unexpected-discovery
#10
Eduardo Suárez-Morales
The rare asterocherid copepod genus Monocheres, ectosymbionts of corals and sponges, contains only two species, one from Mauritius (Indian Ocean) and the other one from Brazil (western Atlantic). From the analysis of the digestive caecum contents of the benthic hesionid polychaete Hesione picta Müller, 1858, an adult female of an undescribed species of Monocheres was unexpectedly recovered; it is the third species of this rare asterocherid genus. The new species, Monocheres sergioi sp. n., has the distinctive reduction of the fifth leg as a process with a single seta...
2016: ZooKeys
https://www.readbyqxmd.com/read/27505954/-clinical-effect-of-staged-repair-and-reconstruction-of-multiple-ligament-injuries-in-knee-joints
#11
Zhen Lai, Zhi-xiang Liu, Jun-long Yang, Zhao-fei Zhang, Yi-liang Chang
OBJECTIVE: To evaluate clinical outcomes of anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL) reconstruction under arthroscopy combined with limited open repair of medial collateral ligament (MCL) for the treatment of multiple ligament injuries of knee joints. METHODS: From March 2006 and June 2012,the data of 14 patients (14 knees) with multiple injuries of ACL, PCL, and MCL were collected. There were 8 males and 6 females with an average age of (31...
May 2016: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/27489415/acute-anterior-cruciate-ligament-injuries-in-multisport-elite-players-demography-association-and-pattern-in-different-sports
#12
Ravi Gupta, Tanu Khanna, Gladson David Masih, Anubhav Malhotra, Anil Kapoor, Pawan Kumar
BACKGROUND: Anterior cruciate ligament (ACL) tear rates are known to vary from sport to sport. To the best of our knowledge, the relationship of ACL injury with different sports is not reported earlier. The objective of the present study is to investigate the association of ACL injury with different sports and to document various associated ligamentous, meniscal, and chondral lesions of the knee. MATERIALS AND METHODS: Descriptive epidemiological study was carried out in a tertiary care center over a 10-year period...
July 2016: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/27398922/aerial-rotation-effects-on-vertical-jump-performance-among-highly-skilled-collegiate-soccer-players
#13
Leland A Barker, John R Harry, Janet S Dufek, John A Mercer
In soccer matches, jumps involving rotations occur when attempting to head the ball for a shot or pass from set pieces such as corner kicks, goal kicks, and lob passes. However, the 3-dimensional ground reaction forces used to perform rotational jumping tasks are currently unknown. Therefore, the purpose of this study was to compare bilateral, 3-dimensional, ground reaction forces of a standard countermovement jump (CMJ0) to a countermovement jump with a 180° rotation (CMJ180) among Division 1 soccer players...
July 7, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27277073/a-revised-3-column-classification-approach-for-the-surgical-planning-of-extended-lateral-tibial-plateau-fractures
#14
H Hoekstra, K Kempenaers, S Nijs
OBJECTIVES: Variable angle locking compression plates allow for lateral buttress and support of the posterolateral joint surface of tibial plateau fractures. This gives room for improvement of the surgical 3-column classification approach. Our aim was to revise and validate the 3-column classification approach to better guide the surgical planning of tibial plateau fractures extending into the posterolateral corner. METHODS: In contrast to the 3-column classification approach, in the revised approach the posterior border of the lateral column in the revised approach lies posterior instead of anterior of the fibula...
June 8, 2016: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/26956990/massive-obesity-and-hyperphagia-in-posterior-bilateral-periventricular-heterotopias-case-report
#15
Valeria Guglielmi, Roberto Floris, Monica D'Adamo, Francesco Garaci, Giuseppe Novelli, Paolo Sbraccia
BACKGROUND: Bilateral posterior periventricular nodular heterotopia PNH is a complex malformation of cortical development with imaging features distinguishing it from classic bilateral PNH associated with filamin (FLNA) mutations. It distinctively consists of variably sized nodules of neurons along the trigones and temporal or occipital horns of the lateral ventricles and spectrum of developmental disorders of the mid-/hindbrain. This association suggests that pPNH is part of a more diffuse process of posterior or infrasylvian brain developmental abnormalities other than just a disorder of neuronal migration...
2016: BMC Medical Genetics
https://www.readbyqxmd.com/read/26949467/new-radiographic-index-for-occipito-cervical-instability
#16
Moon Soo Park, Seong-Hwan Moon, Tae-Hwan Kim, Jae Keun Oh, Ji Hoon Nam, Jae Kyun Jung, K Daniel Riew
STUDY DESIGN: Retrospective study. PURPOSE: To propose a new radiographic index for occipito-cervical instability. OVERVIEW OF LITERATURE: Symptomatic atlanto-occipital instability requires the fusion of the atlanto-occipital joint. However, measurements of occipito-cervical translation using the Wiesel-Rothman technique, Power's ratio, and basion-axial interval are unreliable because the radiologic landmarks in the occipito-cervical junction lack clarity in radiography...
February 2016: Asian Spine Journal
https://www.readbyqxmd.com/read/26915777/corrective-osteotomies-for-malunited-malleolar-fractures
#17
REVIEW
Daniel Weber, Martin Weber
Ankle fractures are common and may be treated nonoperatively or by reduction and internal fixation. Both treatments may lead to nonanatomic healing, called malunions. Malunions lead to joint instability and pathologic load transfer. Arthritic joint destruction may be the consequence. Corrective osteotomies for malunited malleolar fractures have to restore anatomic conditions. Osteotomies of the medial malleolus, lateral malleolus, posterior malleolus (Volkmann's triangle), and the posteromedial corner or combinations thereof described...
March 2016: Foot and Ankle Clinics
https://www.readbyqxmd.com/read/26842312/comparison-of-anatomic-posterolateral-knee-reconstruction-using-2-different-popliteofibular-ligament-techniques
#18
COMPARATIVE STUDY
Kyoung Ho Yoon, Sang Hak Lee, Soo Yeon Park, Sang Eon Park, Dae Hyun Tak
BACKGROUND: Anatomic posterolateral knee reconstruction is a surgical procedure that reconstructs the lateral collateral ligament (LCL), the popliteus tendon, and the popliteofibular ligament (PFL). Until recently, diverse techniques have been reported for this reconstruction; however, the gold standard is still a matter of debate. HYPOTHESIS: Clinical outcomes and stability with tibiofibular-based PFL reconstruction would be better than those with femorofibular-based PFL reconstruction...
April 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/26775144/a-pilot-study-to-assess-the-feasibility-and-accuracy-of-using-haptic-technology-to-occlude-digital-dental-models
#19
Wen Wu, Yuhai Cen, Yang Hong, Andrew Keeling, Balvinder Khambay
OBJECTIVES: The use of haptic technology as an adjunct to clinical teaching is well documented in medicine and dentistry. However its application in clinical patient care is less well documented. The aim of this pilot study was to determine the feasibility and accuracy of using a haptic device to determine the occlusion of virtual dental models. METHODS: The non-occluded digital models of 20 pre-treatment individuals were chosen from the database of Faculty of Dentistry, The University of Hong Kong...
March 2016: Journal of Dentistry
https://www.readbyqxmd.com/read/26726978/proximal-tibia-chondroblastoma-treated-with-curettage-and-bone-graft-and-cement-use
#20
Hwan Seong Cho, Yeong Kyoon Park, Joo Han Oh, Jung Hyun Lee, Ilkyu Han, Han-Soo Kim
Chondroblastoma has a predilection for the epiphyses or apophyses of long tubular bones. Management of lesions in the proximal tibia is challenging because it is difficult to gain access to intraepiphyseal lesions for completion of curettage. From October 2007 to December 2011, 9 patients with de novo chondroblastoma of the proximal tibia underwent surgery at the authors' institution. All patients initially presented with pain, and 5 patients had limitation of range of motion of the ipsilateral knee. Four lesions abutted the tibial attachment sites of the cruciate ligaments...
January 2016: Orthopedics
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