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3d orthopaedics

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https://www.readbyqxmd.com/read/29186079/assessment-of-embedded-conjugated-polymer-sensor-arrays-for-potential-load-transmission-measurement-in-orthopaedic-implants
#1
Carolina Micolini, Frederick Benjamin Holness, James A Johnson, Aaron David Price
Load transfer through orthopaedic joint implants is poorly understood. The longer-term outcomes of these implants are just starting to be studied, making it imperative to monitor contact loads across the entire joint implant interface to elucidate the force transmission and distribution mechanisms exhibited by these implants in service. This study proposes and demonstrates the design, implementation, and characterization of a 3D-printed smart polymer sensor array using conductive polyaniline (PANI) structures embedded within a polymeric parent phase...
November 29, 2017: Sensors
https://www.readbyqxmd.com/read/29184659/multi-modal-imaging-model-based-tracking-and-mixed-reality-visualisation-for-orthopaedic-surgery
#2
Sing Chun Lee, Bernhard Fuerst, Keisuke Tateno, Alex Johnson, Javad Fotouhi, Greg Osgood, Federico Tombari, Nassir Navab
Orthopaedic surgeons are still following the decades old workflow of using dozens of two-dimensional fluoroscopic images to drill through complex 3D structures, e.g. pelvis. This Letter presents a mixed reality support system, which incorporates multi-modal data fusion and model-based surgical tool tracking for creating a mixed reality environment supporting screw placement in orthopaedic surgery. A red-green-blue-depth camera is rigidly attached to a mobile C-arm and is calibrated to the cone-beam computed tomography (CBCT) imaging space via iterative closest point algorithm...
October 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/29179285/-efficacy-of-3d-print-guide-technique-in-one-stage-posterior-approach-for-the-treatment-of-cervical-and-thoracic-tuberculosis-with-kyphosis
#3
Nazierhan Shaxika, Z G Sun, H Yuan, H Wang
Objective: To investigate the application of 3D printing technology in the treatment of patients with cervical kyphosis and paraplegia in different segments of the cervical spine after one-stage debridement, bone graft fusion and pedicle screw fixation. Methods: From January 2008 to January 2017, a total of 31 patients with thoracolumbar tuberculosis were treated in the Department of Orthopaedics, the Xinjiang Uygur Autonomous Region people's Hospital.Lesions of the thoracic spine (T1-T4) in 8 cases, (C5-C7) in 10 cases, cervical and thoracic segment in 13 cases, involving a total of 2 cases of vertebral body in 7 cases, 3 cases of vertebral body in 14 cases, 4 cases of vertebral body...
November 21, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29159674/the-quadrant-method-measuring-four-points-is-as-a-reliable-and-accurate-as-the-quadrant-method-in-the-evaluation-after-anatomical-double-bundle-acl-reconstruction
#4
Yuta Mochizuki, Takao Kaneko, Keisuke Kawahara, Shinya Toyoda, Norihiko Kono, Masaru Hada, Hiroyasu Ikegami, Yoshiro Musha
PURPOSE: The quadrant method was described by Bernard et al. and it has been widely used for postoperative evaluation of anterior cruciate ligament (ACL) reconstruction. The purpose of this research is to further develop the quadrant method measuring four points, which we named four-point quadrant method, and to compare with the quadrant method. METHODS: Three-dimensional computed tomography (3D-CT) analyses were performed in 25 patients who underwent double-bundle ACL reconstruction using the outside-in technique...
November 20, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29141359/-analysis-of-the-tibial-baseplate-coverage-and-symmetrical-tibial-prosthesis-in-primary-total-knee-arthroplasty
#5
C L Zhao, J P Wang, Z H Sun, M Li, J W Chen
Objective: To investigate the tibial baseplate coverage with symmnetrical tibial prosthesis in primary total knee arthroplasty (TKA). Methods: From August 2014 to February 2015, 39 patients (39 knees) with varus knee osteoarthritis were retrospective reviewed in Department of Orthopaedics, Tianjin Xiqing Hospital. Nine males and 30 females; aged 50 to 78 years (67±6 year). 3D tibia models of the knee were built with Mimics 10.01 software, simulated TKA surgeries were performed. The morphology of the proximal tibia was measured, including the mediolateral (ML), anteroposterior (AP) and medial and lateral tibial plateau AP dimensions...
November 7, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29094321/reproducibility-of-length-measurements-of-the-lower-limb-by-using-eos%C3%A2
#6
A Clavé, D G Maurer, N S Nagra, F Fazilleau, C Lefèvre, E Stindel
BACKGROUND: Lower-limb discrepancy following total hip arthroplasty is the third-most common reason for patient dissatisfaction in orthopaedic surgery. Therefore, accurate planning and evaluation methods are mandatory. The main aim of this study was to evaluate the reliability of the EOS™ system by establishing and comparing the reproducibility of lower-limb automatic and manual 3D measurements. We hypothesized that the reproducibility of the lower-limb measurements is similar regardless of the method used and with an agreement higher than 0...
November 1, 2017: Musculoskeletal Surgery
https://www.readbyqxmd.com/read/29081149/-effect-of-simulating-leg-length-inequality-on-spinal-and-pelvic-posture-in-the-elderly
#7
H F Zhang, J L Liao, M Ji, S Y Tang, J F Jin, L Chen, L J Wu
Objective: To study the effects of simulating leg length inequality on the spine and pelvic posture in standing and walking states and to explore their compensatory laws. Methods: From January to April, a total of 44 healthy volunteers were rasterstereographically examined for spine and pelvis in Institute of Digitized Medicine, Wenzhou Medical University and Department of Orthopaedics, First Affiliated Hospital of Wenzhou Medical University.Volunteers wore uniform shoes, and single 5 mm thick insoles were customized...
October 24, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29058687/planning-guidance-and-quality-assurance-of-pelvic-screw-placement-using-deformable-image-registration
#8
Joseph Goerres, Ali Uneri, Matthew W Jacobson, Benjamin Ramsay, Tharindu De Silva, Michael D Ketcha, Runze Han, Amir Manbachi, Sebastian Vogt, Gerhard Kleinszig, Jean-Paul Wolinsky, Greg Michael Osgood, Jeffrey H Siewerdsen
Percutaneous pelvic screw placement is challenging due to narrow bone corridors surrounded by vulnerable structures and difficult visual interpretation of complex anatomical shapes in 2D x-ray projection images. To address these challenges, a system for planning, guidance, and quality assurance (QA) is presented, providing functionality analogous to surgical navigation, but based on robust 3D-2D image registration techniques using fluoroscopy images already acquired in routine workflow. Two novel aspects of the system are investigated: automatic planning of pelvic screw trajectories and the ability to account for deformation of surgical devices (K-wire deflection)...
October 23, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28972789/a-prospective-evaluation-of-femoral-tunnel-placement-for-anatomic-anterior-cruciate-ligament-reconstruction-using-3-dimensional-magnetic-resonance-imaging
#9
Adam Hart, Thiru Sivakumaran, Mark Burman, Tom Powell, Paul A Martineau
BACKGROUND: The recent emphasis on anatomic reconstruction of the anterior cruciate ligament (ACL) is well supported by clinical and biomechanical research. Unfortunately, the location of the native femoral footprint can be difficult to see at the time of surgery, and the accuracy of current techniques to perform anatomic reconstruction is unclear. PURPOSE: To use 3-dimensional magnetic resonance imaging (3D MRI) to prospectively evaluate patients with torn ACLs before and after reconstruction and thereby assess the accuracy of graft position on the femoral condyle...
October 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28951659/macrodamage-accumulation-model-for-a-human-femur
#10
Farah Hamandi, Tarun Goswami
The objective of this study was to more fully understand the mechanical behavior of bone tissue that is important to find an alternative material to be used as an implant and to develop an accurate model to predict the fracture of the bone. Predicting and preventing bone failure is an important area in orthopaedics. In this paper, the macrodamage accumulation models in the bone tissue have been investigated. Phenomenological models for bone damage have been discussed in detail. In addition, 3D finite element model of the femur prepared from imaging data with both cortical and trabecular structures is delineated using MIMICS and ANSYS® and simulated as a composite structure...
2017: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/28944574/a-novel-approach-for-intra-operative-shape-acquisition-of-the-tibio-femoral-joints-using-3d-laser-scanning-in-computer-assisted-orthopaedic-surgery
#11
Shailesh V Joshi, Philip J Rowe
BACKGROUND: Image registration (IR) is an important process of developing a spatial relationship between pre-operative data and the physical patient in the operation theatre. Current IR techniques for Computer Assisted Orthopaedic Surgery (CAOS) are time consuming and costly. There is a need to automate and accelerate this process. METHODS: Bespoke quick, cost effective, contactless and automated 3D laser scanning techniques based on the DAVID Laserscanner method were designed...
September 24, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28921006/computer-aided-planning-of-orthopaedic-surgeries-the-definition-of-generic-planning-steps-for-bone-removal-procedures
#12
David Putzer, Jose Luis Moctezuma, Michael Nogler
PURPOSE: An increasing number of orthopaedic surgeons are using computer aided planning tools for bone removal applications. The aim of the study was to consolidate a set of generic functions to be used for a 3D computer assisted planning or simulation. METHODS: A limited subset of 30 surgical procedures was analyzed and verified in 243 surgical procedures of a surgical atlas. Fourteen generic functions to be used in 3D computer assisted planning and simulations were extracted...
November 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28871407/in-vitro-antimicrobial-susceptibility-testing-methods-agar-dilution-to-3d-tissue-engineered-models
#13
REVIEW
A Schumacher, T Vranken, A Malhotra, J J C Arts, P Habibovic
In the field of orthopaedic surgery, bacterial invasion of implants and the resulting periprosthetic infections are a common and unresolved problem. Antimicrobial susceptibility testing methods help to define the optimal treatment and identify antimicrobial resistance. This review discusses proven gold-standard techniques and recently developed models for antimicrobial susceptibility testing, while also providing a future outlook. Conventional, gold-standard methods, such as broth microdilution, are still widely applied in clinical settings...
September 4, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28867667/long-term-effects-of-orthoses-use-on-the-changes-of-foot-and-ankle-joint-motions-of-children-with-spastic-cerebral-palsy
#14
Xue-Cheng Liu, David Embrey, Channing Tassone, Kim Zvara, Brenna Brandsma, Roger Lyon, Karin Goodfriend, Sergey Tarima, John Thometz
BACKGROUND: Orthoses commonly are prescribed to children with cerebral palsy (CP) to provide foot correction and to improve ambulatory function. Immediate effects of ankle foot orthosis (AFOs) have been investigated, but long-term kinematic effects are lacking clinical evidence. OBJECTIVE: To determine changes in 3-dimensional ankle and foot segment motion in pediatric patients with CP between initial and follow-up visits (18-month average time differences) in both barefoot gait and gait with their AFO...
September 1, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/28856399/three-dimensional-printing-technology-and-materials-for-treatment-of-elbow-fractures
#15
Long Yang, Brian Grottkau, Zhixu He, Chuan Ye
PURPOSE: 3D printing is a rapid prototyping technology that uses a 3D digital model to physically build an object. The aim of this study was to evaluate the peri-operative effect of 3D printing in treating complex elbow fractures and its role in physician-patient communication and determine which material is best for surgical model printing. METHOD: Forty patients with elbow fractures were randomly divided into a 3D printing-assisted surgery group (n = 20) and a conventional surgery group (n = 20)...
November 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28832345/biomimetic-surface-functionalization-of-clinically-relevant-metals-used-as-orthopaedic-and-dental-implants
#16
Elena García-Gareta, Jia Hua, Alodia Orera, Nupur Kohli, Jonathan C Knowles, Gordon W Blunn
Titanium and its alloys or tantalum (Ta) are materials used in orthopaedic and dental implants due to their excellent mechanical properties and biocompatibility. However, their bioactivity and osteoconductivity is low. With a view to improving these materials bioactivity we hypothesised that the surface of Ta and TiAl6V4 can be functionalised with biomimetic, amorphous nano-sized calcium-phosphate (CaP) apatite-like deposits, instead of creating uniform coatings, which can lead to flaking, delamination and poor adherence...
August 23, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28809629/-talar-neck-fractures-treated-using-percutaneous-screw-fixation
#17
R Veselý, M Kelbl, J Kacián, V Hulka, J Kočiš, R Kunovský
PURPOSE OF THE STUDY Closed reduction and percutaneous fixation of nondisplaced talar neck fractures have been applied by some authors. The aim of this paper is to assess the results and complications of this minimally invasive technique. MATERIAL AND METHODS In the period from 2009 to 2014, twenty-one patients with a talar neck fracture were observed after closed reduction and percutaneous screw fixation in the Traumatological Hospital in Brno. The mean age of the patients was 38 years (range 18-56 years)...
2017: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28773240/metallic-biomaterials-current-challenges-and-opportunities
#18
REVIEW
Karthika Prasad, Olha Bazaka, Ming Chua, Madison Rochford, Liam Fedrick, Jordan Spoor, Richard Symes, Marcus Tieppo, Cameron Collins, Alex Cao, David Markwell, Kostya Ken Ostrikov, Kateryna Bazaka
Metallic biomaterials are engineered systems designed to provide internal support to biological tissues and they are being used largely in joint replacements, dental implants, orthopaedic fixations and stents. Higher biomaterial usage is associated with an increased incidence of implant-related complications due to poor implant integration, inflammation, mechanical instability, necrosis and infections, and associated prolonged patient care, pain and loss of function. In this review, we will briefly explore major representatives of metallic biomaterials along with the key existing and emerging strategies for surface and bulk modification used to improve biointegration, mechanical strength and flexibility of biometals, and discuss their compatibility with the concept of 3D printing...
July 31, 2017: Materials
https://www.readbyqxmd.com/read/28660731/zygomaticomaxillary-suture-maturation-part-ii-the-influence-of-sutural-maturation-on-the-response-to-maxillary-protraction
#19
F Angelieri, A C Ruellas, M S Yatabe, L H S Cevidanes, L Franchi, C Toyama-Hino, H J De Clerck, T Nguyen, J A McNamara
OBJECTIVE: To evaluate the influence of the maturational stages of zygomaticomaxillary sutures (ZMS) on the response to maxillary protraction. SUBJECTS AND METHODS: A total of 40 Class III patients were treated retrospectively with either a combination of rapid maxillary expansion and facial mask (RME/FM) or bone-anchored maxillary protraction (BAMP). The RME/FM group consisted of 18 patients (mean age 8.3 years), while the BAMP group was comprised of 22 patients (mean age 11...
August 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28657561/total-knee-replacement-intraoperative-and-postoperative-kinematic-assessment
#20
M Bontempi, U Cardinale, L Bragonzoni, L Macchiarola, A Grassi, C Signorelli, G M Marcheggiani Muccioli, Stefano Zaffagnini
BACKGROUND AND AIM: The main goals of the total knee arthroplasty (TKA) is to reduce the perceived pain and  restore knee mobility and function in case of osteoarthritic knees joints. Literature shows how the three major causes of TKA failures are related to wear, loosening and instability and this is due to a problem of imbalance and malalignment. Intraoperative and postoperative kinematics analysis could be of benefit for improving surgery outcome. The aim of the present paper is to give an overview of the two set-up with the highest accuracy for intraoperative and postoperative TKA kinematics evaluation, currently in use at Istituto Ortopedico Rizzoli...
June 7, 2017: Acta Bio-medica: Atenei Parmensis
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