Read by QxMD icon Read

Orthopedic implants in magnetic resonance

Pia M Jungmann, Christoph A Agten, Christian W Pfirrmann, Reto Sutter
The prevalence of orthopedic metal implants is continuously rising in the aging society. Particularly the number of joint replacements is increasing. Although satisfying long-term results are encountered, patients may suffer from complaints or complications during follow-up, and often undergo magnetic resonance imaging (MRI). Yet metal implants cause severe artifacts on MRI, resulting in signal-loss, signal-pileup, geometric distortion, and failure of fat suppression. In order to allow for adequate treatment decisions, metal artifact reduction sequences (MARS) are essential for proper radiological evaluation of postoperative findings in these patients...
March 25, 2017: Journal of Magnetic Resonance Imaging: JMRI
Yuan James Rao, Jacqueline E Zoberi, Mo Kadbi, Perry W Grigsby, Jochen Cammin, Stacie L Mackey, Jose Garcia-Ramirez, S Murty Goddu, Julie K Schwarz, H Michael Gach
Magnetic resonance imaging (MRI) plays an increasingly important role in brachytherapy planning for cervical cancer. Yet, metal tandem, ovoid intracavitary applicators, and fiducial markers used in brachytherapy cause magnetic susceptibility artifacts in standard MRI. These artifacts may impact the accuracy of brachytherapy treatment and the evaluation of tumor response by misrepresenting the size and location of the metal implant, and distorting the surrounding anatomy and tissue. Metal artifact reduction sequences (MARS) with high bandwidth RF selective excitations and turbo spin-echo readouts were developed for MRI of orthopedic implants...
April 21, 2017: Physics in Medicine and Biology
Matthew F Koff, Alissa J Burge, Kevin M Koch, Hollis G Potter
Over one million total joint replacement surgeries were performed in the US in 2013 alone, and this number is expected to more than double by 2030. Traditional imaging techniques for postoperative evaluation of implanted devices, such as radiography, computerized tomography, or ultrasound, utilize ionizing radiation, suffer from beam hardening artifact, or lack the inherent high contrast necessary to adequately evaluate soft tissues around the implants, respectively. Magnetic resonance imaging (MRI), due to its ability to generate multiplanar, high-contrast images without the use of ionizing radiation is ideal for evaluating periprosthetic soft tissues but has traditionally suffered from in-plane and through-plane data misregistration due to the magnetic susceptibility of implanted materials...
February 2, 2017: Journal of Magnetic Resonance Imaging: JMRI
Martin Heller, Heide-Katharina Bauer, Elisabeth Goetze, Matthias Gielisch, Klaus E Roth, Philipp Drees, Gerrit S Maier, Bernhard Dorweiler, Ahmed Ghazy, Meik Neufurth, Werner E G Müller, Heinz C Schröder, Xiaohong Wang, Christian-Friedrich Vahl, Bilal Al-Nawas
Already three decades ago, the potential of medical 3D printing (3DP) or rapid prototyping for improved patient treatment began to be recognized. Since then, more and more medical indications in different surgical disciplines have been improved by using this new technique. Numerous examples have demonstrated the enormous benefit of 3DP in the medical care of patients by, for example, planning complex surgical interventions preoperatively, reducing implantation steps and anesthesia times, and helping with intraoperative orientation...
2016: International Journal of Computerized Dentistry
Ely L Steinberg, Eitan Segev, Michael Drexler, Tomer Ben-Tov, Snir Nimrod
The progression from standard celluloid films to digitalized technology led to the development of new software programs to fulfill the needs of preoperative planning. We describe here preoperative digitalized programs and the variety of conditions for which those programs can be used to facilitate preparation for surgery. A PubMed search using the keywords "digitalized software programs," "preoperative planning" and "total joint arthroplasty" was performed for all studies regarding preoperative planning of orthopedic procedures that were published from 1989 to 2014 in English...
June 2016: Israel Medical Association Journal: IMAJ
Jfd Montero, Lca Barbosa, A P Ulisses, G Barra, M C Fredel, Cam Benfatti, R S Magini, A L Pimenta, Jcm Souza
PEEK (poly-ether-ether-ketone) is currently presented as an alternative for orthopedic implants due to its biocompatibility and low elastic modulus compared to titanium. Also, a sulphonation treatment can functionalize PEEK to incorporate therapeutical substances. The objective of this work was to functionalize a PEEK film to allow the incorporation of novel lactam-based anti-biofilms compounds. PEEK samples were functionalized by sulphuric acid treatment and dissolved in dimethylsulfoxide where lactams were added to be incorporated into the polymer...
July 26, 2016: Journal of Biomedical Materials Research. Part A
Brett S Talbot, Eric P Weinberg
Metallic artifact at orthopedic magnetic resonance (MR) imaging continues to be an important problem, particularly in the realm of total joint arthroplasty. Complications often follow total joint arthroplasty and can be expected for a small percentage of all implanted devices. Postoperative complications involve not only osseous structures but also adjacent soft tissues-a highly problematic area at MR imaging because of artifacts from metallic prostheses. Without special considerations, susceptibility artifacts from ferromagnetic implants can unacceptably degrade image quality...
January 2016: Radiographics: a Review Publication of the Radiological Society of North America, Inc
Timothy Ariyanayagam, Paul Napier Malcolm, Andoni Paul Toms
Artifact from metallic orthopedic prosthesis is caused by inhomogeneity in the B0 magnetic field, particularly in the frequency encoding direction. This results in signal voids, signal pileup, and geometric distortion. Advances in reducing this artifact allow us to assess the complications of joint replacement and improve imaging of nearby tissues such as within the pelvis. Selection of titanium implants and lower field strength MR units provide optimal conditions for artifact reduction. Conventional sequences can be optimized by using inversion recovery sequences, large matrices, high receiver bandwidths, and thin slices...
September 2015: Seminars in Musculoskeletal Radiology
Adam E M Eltorai, Eric Nguyen, Alan H Daniels
Three-dimensional (3D) printing is emerging as a clinically promising technology for rapid prototyping of surgically implantable products. With this commercially available technology, computed tomography or magnetic resonance images can be used to create graspable objects from 3D reconstructed images. Models can enhance patients' understanding of their pathology and surgeon preoperative planning. Customized implants and casts can be made to match an individual's anatomy. This review outlines 3D printing, its current applications in orthopedics, and promising future directions...
November 2015: Orthopedics
B Schlatterer, J-M Linares, J Cazal, P Merloz, S Plaweski
BACKGROUND: Patient-specific cutting guides were recently introduced to facilitate total knee arthroplasty (TKA). Their accuracy in achieving optimal implant alignment remains controversial. The objective of this study was to evaluate postoperative radiographic outcomes of 50 TKA procedures with special attention to posterior tibial slope (PTS), which is difficult to control intraoperatively. We hypothesized that patient-specific cutting guides failed to consistently produce the planned PTS...
October 2015: Orthopaedics & Traumatology, Surgery & Research: OTSR
William D Murrell, Adam W Anz, Humeira Badsha, William F Bennett, Robert E Boykin, Arnold I Caplan
In orthopedic surgery there has been a never-ending quest to improve surgical outcome and the patient's experience. Progression has been marked by the refinement of surgical techniques and instruments and later by enhanced diagnostic imaging capability, specifically magnetic resonance. Over time implant optimization was achieved, along with the development of innovative minimally invasive arthroscopic technical skills to leverage new versions of classic procedures and implants to improve short-term patient morbidity and initial, mid-term, and long-term patient outcomes...
April 2015: PM & R: the Journal of Injury, Function, and Rehabilitation
Yue-fen Zou, Bin Chu, Chuan-bing Wang, Zhi-yi Hu
PURPOSE: The study was performed to evaluate magnetic resonance (MR) issues for the latest standard brands of plates and screws used in orthopedic surgery at a 1.5-T MR system, including the safety and metallic artifacts. METHODS: The plates and screws (made of titanium alloy and stainless steel materials, according to the latest standard brands) were assessed for displacement in degrees, MRI-related heating and artifacts at a 1.5-T MR system. The displacement in degrees of the plates and screws was evaluated on an angel-measurement instrument at the entrance of the MR scanner...
March 2015: European Journal of Radiology
Zhongwen Zhang, Xin Zhong, Huiru Ji, Zibin Tang, Jianpeng Bai, Minmin Yao, Jianlei Hou, Minghao Zheng, David J Wood, Jiazhi Sun, Shu-Feng Zhou, Aibing Liu
Articular cartilage injury is the most common type of damage seen in clinical orthopedic practice. The matrix-induced autologous chondrocyte implant (MACI) was developed to repair articular cartilage with an advance on the autologous chondrocyte implant procedure. This study aimed to evaluate whether MACI is a safe and efficacious cartilage repair treatment for patients with knee cartilage lesions. The primary outcomes were the Knee Injury and Osteoarthritis Outcome Score (KOOS) domains and magnetic resonance imaging (MRI) results, compared between baseline and postoperative months 3, 6, 12, and 24...
2014: Drug Design, Development and Therapy
Tae-Kwon Kim, Tae-Wan Jeong, Dae-Hee Lee
Foreign body reactions may occur in patients who receive bioabsorbable implants during orthopedic surgery for fractures and ligament repair. The authors describe a 34-year-old man who presented with a palpable tender mass on the lateral aspect of the left knee of 1 month's duration. He underwent posterior cruciate ligament and posterolateral corner reconstruction 3 years earlier. Physical examination showed a 1×1-cm soft, nontender mass without localized warmth on the lateral epicondyle of the distal femur...
December 2014: Orthopedics
Silke Schlaubitz, Sidi Mohammed Derkaoui, Lydia Marosa, Sylvain Miraux, Martine Renard, Sylvain Catros, Catherine Le Visage, Didier Letourneur, Joëlle Amédée, Jean-Christophe Fricain
The repair of bone defects is of particular interest for orthopedic, oral, maxillofacial, and dental surgery. Bone loss requiring reconstruction is conventionally addressed through bone grafting. Depending on the size and the location of the defect, this method has limits and risks. Biomaterials can offer an alternative and have features supporting bone repair. Here, we propose to evaluate the cellular penetration and bone formation of new macroporous beads based on pullulan/dextran that has been supplemented with nanocrystalline hydroxyapatite in a rat model...
2014: PloS One
Nuno Guitian Oliveira, Tatiana Sirgado, Luís Reis, Luís F V Pinto, Cláudia Lobato da Silva, Frederico Castelo Ferreira, Alexandra Rodrigues
Chitosan biocompatibility and biodegradability properties make this biopolymer promising for the development of advanced internal fixation devices for orthopedic applications. This work presents a detailed study on the production and characterization of three dimensional (3D) dense, non-porous, chitosan-based structures, with the ability to be processed in different shapes, and also with high strength and stiffness. Such features are crucial for the application of such 3D structures as bioabsorbable implantable devices...
December 2014: Journal of the Mechanical Behavior of Biomedical Materials
Yi-heng Yin, Xin-guang Yu, Guang-yu Qiao, Sheng-li Guo, Jian-ning Zhang
STUDY DESIGN: Retrospective study of 146 patients with the diagnosis of occipitalization, atlantoaxial dislocation (AAD) and basilar invagination, using a novel surgical treatment strategy. OBJECTIVE: To introduce a novel fixation and reduction technique. SUMMARY OF BACKGROUND DATA: Atlas occipitalization associated with basilar invagination often result in fixed AAD that need reduction and occipitocervical fixation. The widely used occipitocervical fixation with suboccipital screws has several limitations such as the poor screw purchase in maldevelopment of the occipital bone, limited area available for implants in previous suboccipital craniectomy...
November 15, 2014: Spine
Hao Wu, Yongjie Chen, Can Zhang, Zan Chen, Fengzeng Jian
OBJECTIVE: To evaluate the accuracy and safety of mini-invasive and percutaneous pedicle screw fixation with fluoroscopy for lumbar degenerative disease. METHODS: For this retrospective study, 64 cases of lumbar degenerative disease underwent mini-invasive transforaminal lumbar interbody fusion (TLIF) under microscope plus percutaneous pedicle screw fixation with fluoroscopy of lumbar spine from March 2012 to October 2013. The parameters of operative duration, intraoperative blood loss volume, hospital stay and complications were recorded and analyzed...
June 17, 2014: Zhonghua Yi Xue za Zhi [Chinese medical journal]
Rainer Siebold, Georgios Karidakis, Francis Fernandez
PURPOSE: Medial patellofemoral ligament (MPFL) reconstruction is a well-established treatment option in recurrent patella dislocation. The combination with associated retropatellar cartilage lesions are severe injuries and very difficult to treat. The purpose of this study was to evaluate our clinical results of MPFL reconstruction and autologous chondrocyte implantation (ACI). METHODS: Thirteen patients with recurrent patella dislocation were treated with a combination of MPFL reconstruction and ACI at our institution between 2010 and 2014...
October 2014: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Steve K Kwak, Brian S Kern, Richard D Ferkel, Keith W Chan, Sina Kasraeian, Gregory R Applegate
BACKGROUND: The treatment of osteochondral lesions of the talus after failed surgery is challenging, with no clear solution. Short-term results using autologous chondrocyte implantation have been promising. PURPOSE: To report the long-term outcomes of patients who underwent autologous chondrocyte implantation (ACI) of the talus after failed marrow stimulation techniques for osteochondral lesions of the talus (OLTs). STUDY DESIGN: Case series; Level of evidence, 4...
September 2014: American Journal of Sports Medicine
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"