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https://www.readbyqxmd.com/read/28449202/barn-owls-maximize-head-rotations-by-a-combination-of-yawing-and-rolling-in-functionally-diverse-regions-of-the-neck
#1
Markus Krings, John A Nyakatura, Mark L L M Boumans, Martin S Fischer, Hermann Wagner
Owls are known for their outstanding neck mobility: these birds can rotate their heads more than 270°. The anatomical basis of this extraordinary neck rotation ability is not well understood. We used X-ray fluoroscopy of living owls as well as forced neck rotations in dead specimens and computer tomographic (CT) reconstructions to study how the individual cervical joints contribute to head rotation in barn owls (Tyto furcata pratincola). The X-ray data showed the natural posture of the neck, and the reconstructions of the CT-scans provided the shapes of the individual vertebrae...
April 27, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28448851/accurate-3d-reconstruction-of-bony-surfaces-using-ultrasonic-synthetic-aperture-techniques-for-robotic-knee-arthroplasty
#2
William Kerr, Philip Rowe, Stephen Gareth Pierce
Robotically guided knee arthroplasty systems generally require an individualized, preoperative 3D model of the knee joint. This is typically measured using Computed Tomography (CT) which provides the required accuracy for preoperative surgical intervention planning. Ultrasound imaging presents an attractive alternative to CT, allowing for reductions in cost and the elimination of doses of ionizing radiation, whilst maintaining the accuracy of the 3D model reconstruction of the joint. Traditional phased array ultrasound imaging methods, however, are susceptible to poor resolution and signal to noise ratios (SNR)...
April 19, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28448707/-joint-replacement-and-giant-cell-tumor-report-of-8-cases
#3
J G Martínez-Estrada, O Santamaría-Bahena
INTRODUCTION: The giant-cell tumor is an aggressive neoplasia, represents approximately from the 5 the 8.6% of primary bone tumors; more of 50% affects the pelvic extremity, being able to affect the totality of the bones. OBJECTIVE: To present the case series of tumors around the knee and hip that we offered a tumoral joint replacement as an alternative to amputation. MATERIAL AND METHODS: We present eight cases of extensive giant cells tumors, we did en bloc resection and tumoral joint replacement...
September 2016: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/28442207/tibio-talo-calcaneal-fusion-after-limb-salvage-procedures-a-retrospective-study
#4
Lukas Zak, Gerald E Wozasek
BACKGROUND: The treatment of limb threatening trauma on the distal tibia or hindfoot often results in posttraumatic osteoarthritis requiring tibiotalocalcaneal (TTC) arthrodesis. The purpose of this study was to present a case series of patients undergoing various techniques of joint fusion after bone reconstruction and deformity correction as a salvage procedure. The study should help trauma surgeons making decisions in limb salvage and deformity correction in complex lower leg and foot injuries by presenting options and treatment strategies...
April 15, 2017: Injury
https://www.readbyqxmd.com/read/28442179/ipsilateral-sagittal-split-ramus-osteotomy-to-facilitate-reconstruction-of-the-temporomandibular-joint-after-resection-of-condylar-osteochondroma
#5
X Luo, X Ren, T Li, Y Li, B Ye, S Zhu
We report the outcomes of 12 patients with osteochondroma of the mandibular condyle who were treated by condylectomy with sagittal split ramus osteotomy (SSRO) between January 2011 and October 2015. Variables assessed before and after operation were imaging, appearance, maximum mouth opening, maximum mandibular protrusion, lateral excursion, and function of the temporomandibular joint (TMJ). Patients were followed up for a mean (range) of 21 (13 - 30) months. Outcomes were satisfactory with no complications or recurrence...
April 22, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28441305/step-by-step-technique-for-segmental-reconstruction-of-reverse-hill-sachs-lesions-using-homologous-osteochondral-allograft
#6
Hassanin Alkaduhimi, Michel P J van den Bekerom, Derek F P van Deurzen
Posterior shoulder dislocations are accompanied by high forces and can result in an anteromedial humeral head impression fracture called a reverse Hill-Sachs lesion. This reverse Hill-Sachs lesion can result in serious complications including posttraumatic osteoarthritis, posterior dislocations, osteonecrosis, persistent joint stiffness, and loss of shoulder function. Treatment is challenging and depends on the amount of bone loss. Several techniques have been reported to describe the surgical treatment of lesions larger than 20%...
April 24, 2017: Techniques in Hand & Upper Extremity Surgery
https://www.readbyqxmd.com/read/28439157/re-assessment-of-coronoid-as-a-graft-for-condylar-reconstruction-in-tmj-ankylosis-patients-a-prospective-study-and-literature-review
#7
Gagan Mehta, Shadab Mohammad, Hari Ram, Vibha Singh, Rakesh Kumar Chak, Shiwani Garg, Kuldeep Vishwakarma
INTRODUCTION: Treatment for TMJ ankylosis aims at restoring joint function, improving the patient's aesthetic appearance and quality of life and preventing re-ankylosis. To rebuild a structurally and functionally satisfactory neocondyle is a challenging problem. Aim of this study is to re-assess the coronoid as a graft for condyle reconstruction. MATERIALS AND METHODS: Twenty patients of TMJ ankylosis without involvement of the coronoid process in ankylotic mass, coming in age group elder than 14 years were selected for the study over a period 3 years from 2011 to 2014...
June 2017: Journal of Maxillofacial and Oral Surgery
https://www.readbyqxmd.com/read/28436858/a-spectral-ct-method-to-directly-estimate-basis-material-maps-from-experimental-photon-counting-data
#8
Taly Schmidt, Rina Barber, Emil Sidky
The proposed spectral CT method solves the constrained one-step spectral CT reconstruction (cOSSCIR) optimization problem to estimate basis material maps while modeling the nonlinear X-ray detection process and enforcing convex constraints on the basis map images. In order to apply the optimization-based reconstruction approach to experimental data, the presented method empirically estimates the effective energy-window spectra using a calibration procedure. The amplitudes of the estimated spectra were further optimized as part of the reconstruction process to reduce ring artifacts...
April 24, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28436851/synergistic-pet-and-sense-mr-image-reconstruction-using-joint-sparsity-regularization
#9
Abolfazl Mehranian, Martin Belzunce, Claudia Prieto, Alexander Hammers, Andrew Reader
In this work we propose a generalized joint sparsity regularization prior and reconstruction framework for the syner-gistic reconstruction of PET and undersampled sensitivity en-coded (SENSE) MRI data with the aim of improving image quality beyond that obtained through conventional independent recon-structions. The proposed prior improves upon the joint total vari-ation (TV) using a non-convex potential function that assigns a rel-atively lower penalty for the PET and MR gradients whose mag-nitudes are jointly large, thus permitting the preservation and for-mation of common boundaries irrespective of their relative orien-tation...
April 18, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28434037/open-capsular-and-ligament-reconstruction-with-semitendinosus-hamstring-autograft-successfully-controls-superior-and-posterior-translation-for-type-v-acromioclavicular-joint-dislocation
#10
Raffaele Garofalo, Enrico Ceccarelli, Alessandro Castagna, Vittorio Calvisi, Brody Flanagin, Marco Conti, Sumant G Krishnan
PURPOSE: Appropriate surgical management for type V complete acromioclavicular (AC) joint dislocation remains controversial. The purpose of this paper is to retrospectively report the clinical and radiographic outcomes of an open surgical technique consisting for AC joint ligamentous and capsular reconstruction using autologous hamstring tendon grafts and semi-permanent sutures. METHODS: Between January 2005 and December 2011, 32 consecutive patients with symptomatic type V complete AC joint dislocation underwent surgical treatment using the same technique...
April 22, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28434036/acromion-morphology-and-bone-mineral-density-distribution-suggest-favorable-fixation-points-for-anatomic-acromioclavicular-reconstruction
#11
Andreas Voss, Felix Dyrna, Andrea Achtnich, Alex Hoberman, Elifho Obopilwe, Andreas B Imhoff, Augustus D Mazzocca, Knut Beitzel
PURPOSE: Recent techniques for acromioclavicular (AC) joint reconstruction focus on additional AC cerclage to coracoclavicular (CC)-reconstructions. Due to the specific slim bone morphology at the acromion, there are concerns regarding these additional bone tunnels, as they may predispose to fracture and break out. The purpose of this study was to investigate anatomic properties of the acromion which may help improve surgical techniques directed at injuries to the AC joint. It was hypothesized that via measurements of thickness and density points of increased strength and support could be identified on the acromion...
April 22, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28428910/role-of-the-interosseous-membrane-in-preventing-distal-radioulnar-gapping
#12
Frederick W Werner, Matthew R LeVasseur, Brian J Harley, Ashley Anderson
Background Damage to the interosseous membrane (IOM) can alter load transmission between the radius and ulna and decrease their axial stability. Less is known about the effect of IOM sectioning on the transverse stability between the radius and ulna. Purpose The purpose of this study was to quantify the radioulnar gapping at the distal radioulnar joint (DRUJ) during forearm rotation when the IOM was experimentally sectioned while maintaining the integrity of the distal radioulnar ligaments. Methods In 12 fresh-frozen cadaver forearms tested in a combined wrist-forearm simulator, the increase in gap between the radius and ulna, at the level of the DRUJ, was determined during cyclic forearm rotation following IOM sectioning...
May 2017: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/28427871/arthroscopic-assisted-coracoclavicular-ligament-reconstruction-for-acute-acromioclavicular-dislocation-using-2-clavicular-and-1-coracoid-cortical-fixation-buttons-with-suture-tapes
#13
Sang-Jin Shin, Yoon Sang Jeon, Rag Gyu Kim
PURPOSE: To introduce an arthroscopically assisted coracoclavicular (CC) fixation technique using a cortical fixation button device and to evaluate the clinical and radiologic outcomes in patients with acute acromioclavicular (AC) dislocation who were treated with the technique. METHODS: Twenty-one consecutive patients with grade III and V acute AC dislocation who underwent arthroscopically assisted CC ligament reconstruction using a cortical fixation button device were prospectively enrolled...
April 17, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28425055/what-are-the-oncologic-and-functional-outcomes-after-joint-salvage-resections-for-juxtaarticular-osteosarcoma-about-the-knee
#14
Jing Li, Zhen Wang, Chuanlei Ji, Guojing Chen, Dong Liu, Haodong Zhu
BACKGROUND: Joint salvage surgery for patients with juxtaarticular osteosarcoma remains challenging, especially when the tumor invades the epiphysis. Because patients are surviving longer with current chemotherapy regimens, it is advantageous to retain native joints if possible, especially in young patients. However, the results using joint-preserving tumor resections in this context have not been well characterized. QUESTIONS/PURPOSES: (1) What are the functional outcomes after limb salvage surgery at a minimum of 3 years? (2) What are the oncologic outcomes? (3) Is joint salvage surgery for epiphyseal tumors associated with an increased risk of local recurrence compared with metaphyseal tumors not invading the epiphysis? (4) What are the complications associated with joint salvage surgery? METHODS: Between 2004 and 2013, we treated 117 patients with juxtaarticular osteosarcoma; of those, 43 (38%) were treated with joint salvage surgery, and 41 (95%) of the 43 patients are included in our study...
April 19, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28424860/influence-of-tibial-hybrid-fixation-on-graft-tension-and-stability-in-acl-double-bundle-reconstruction
#15
B H Drews, A Seitz, J Huth, G Bauer, A Ignatius, L Dürselen
PURPOSE: Initial graft tension in anterior cruciate ligament (ACL) reconstruction affects stability and tension loss at follow-up. This study investigated the influence of hybrid tibial fixation in 3-tunnel double-bundle ACL reconstruction on initial graft tension and tension change and stability under anterior and combined rotatory loads. METHODS: Eleven fresh-frozen cadaveric knees were reconstructed with an ACL double bundle using a 3-tunnel technique. Grafts were tightened to 80 N in 60° (AM bundle) and 15° (PL bundle) of flexion...
April 19, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28423061/muscle-contributions-to-medial-tibiofemoral-compartment-contact-loading-following-acl-reconstruction-using-semitendinosus-and-gracilis-tendon-grafts
#16
Jason M Konrath, David J Saxby, Bryce A Killen, Claudio Pizzolato, Christopher J Vertullo, Rod S Barrett, David G Lloyd
BACKGROUND: The muscle-tendon properties of the semitendinosus (ST) and gracilis (GR) are substantially altered following tendon harvest for the purpose of anterior cruciate ligament reconstruction (ACLR). This study adopted a musculoskeletal modelling approach to determine how the changes to the ST and GR muscle-tendon properties alter their contribution to medial compartment contact loading within the tibiofemoral joint in post ACLR patients, and the extent to which other muscles compensate under the same external loading conditions during walking, running and sidestep cutting...
2017: PloS One
https://www.readbyqxmd.com/read/28420425/acceleration-of-tendon-bone-healing-of-anterior-cruciate-ligament-graft-using-intermittent-negative-pressure-in-rabbits
#17
Zhengming Sun, Xiaoqing Wang, Ming Ling, Wei Wang, Yanhai Chang, Guang Yang, Xianghui Dong, Shixun Wu, Xueyuan Wu, Bo Yang, Ming Chen
BACKGROUND: The purpose of this study was to test effects of negative pressure on tendon-bone healing after reconstruction of anterior cruciate ligament (ACL) in rabbits. METHODS: Hind legs of 24 New Zealand White rabbits were randomly selected as negative pressure group and the contralateral hind legs as control. Reconstruction of the ACL was done. Joints of the negative pressure side were placed with drainage tubes connecting the micro-negative pressure aspirator...
April 18, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28420082/can-early-rehabilitation-prevent-posttraumatic-osteoarthritis-in-the-patellofemoral-joint-after-anterior-cruciate-ligament-rupture-understanding-the-pathological-features
#18
Nai-Jen Chang, Ming-You Shie, Kuan-Wei Lee, Pei-Hsi Chou, Chih-Chan Lin, Chih-Jou Chu
Knee instability resulting from anterior cruciate ligament (ACL) rupture is a high-risk factor for posttraumatic osteoarthritis (PTOA) in the patellofemoral joint (PFJ). However, whether non-weight-bearing and weight-bearing treatments have chondroprotective effects remains unclear. Twenty-four adult New Zealand White male rabbits were employed in this study. All animals received ACL transection in the right knee and sham surgery in the left knee. The rabbits were randomly assigned to the following groups: (I) In the sedentary (SED) group, the rabbits (n = 6) were simply kept in their cage; (II) In the continuous passive motion (CPM) group, the rabbits (n = 6) performed CPM exercise for 7 days, starting from the first postoperative day; (III) In the active treadmill exercise (TRE) group, the rabbits (n = 6) performed TRE for 2 weeks; (IV) In the CPM + TRE group, the rabbits (n = 6) executed CPM exercise, followed by TRE...
April 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28410886/the-autogenous-graft-versus-transport-distraction-osteogenesis-for-reconstruction-of-the-ramus-condyle-unit-a-prospective-comparative-study
#19
S Kohli, S Mohanty, S Singh, Sandeep, J Dabas, R Patel
This study aimed to compare the joint function and morphology achieved following condylar reconstruction using sternoclavicular grafts (SCG) versus transport distraction osteogenesis (TDO) in temporomandibular joint (TMJ) ankylosis patients. Twenty-two patients with TMJ ankylosis underwent TMJ reconstruction with SCG or TDO (n=11 each). Radiographic and clinical evaluations were performed at 1 week and at 1, 3, and 6 months post-surgery. Clinical criteria examined included the duration of surgery, mean postoperative mouth opening, excursive jaw movements, and pain scores...
April 11, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28409097/arthroscopic-technique-for-stabilization-of-chronic-acromioclavicular-joint-instability-with-coracoclavicular-and-acromioclavicular-ligament-reconstruction-using-a-gracilis-tendon-graft
#20
Nina Pühringer, Jens Agneskirchner
We present an arthroscopic technique for stabilization of chronic acromioclavicular (AC) joint instability using a transclavicular-transcoracoidal button technique, combined with a coracoclavicular and AC ligament reconstruction using the gracilis tendon. This arthroscopic technique achieves an anatomic reduction of the clavicle without further implant removal. It ensures vertical and horizontal stabilization of the AC joint. Using a horizontal drill hole through the clavicle and looping the gracilis tendon graft around the coracoid avoids weakening of the coracoid with the risk of fracture...
February 2017: Arthroscopy Techniques
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