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Journal of Long-term Effects of Medical Implants

Ismail Hakki Korkmaz, İrfan Kaymaz, Ömer S Yildirim
Total knee arthroplasty (TKA) is a common procedure for treating patients with excessively arthritic knees. Nonetheless, early failure of TKA may occur in the first 5 yr, and up to 20% of TKA procedures can fail after 20 yr. In this study, a new anatomic prosthesis was designed to provide maximum conformity to knee bones and produce less stress and strain, in an effort to avoid possible failure of the prosthesis. Anatomical and conventional knee models were compared on the basis of both geometric conformity and stress and strain results obtained from finite element analysis...
2016: Journal of Long-term Effects of Medical Implants
Carl Hartelius, Alexandros P Apostolopoulos, Tariq Zaman
Loose bodies are pieces of soft tissue that run free within a body cavity, typically in the synovium; loose bodies outside of synovial cavities are very rare. This case study demonstrates such an instance occurring in the subacromial space, which is especially unusual. We report on it coupled with an analysis of the literature of known cases that have occurred previously. A 55-year old right-hand-dominant female patient presented with left shoulder pain. She had injured her left shoulder 7 yr previously and had achieved adequate pain and symptomatic control with physiotherapy...
2016: Journal of Long-term Effects of Medical Implants
Vasilios A Kontogeorgakos, Andreas F Mavrogenis, Panayiotis D Megaloikonomos, Georgios N Panagopoulos, Antonios Koutalos, Marios D Vekris
A 17-yr-old male patient was admitted with a transverse sharp transection caused by broken glass at the volar aspect of his left wrist. Clinical examination showed loss of sensation at the distribution of the median nerve to the thumb, index, and middle finger and an inability to flex the middle finger. Under regional anesthesia and a high humerus tourniquet, surgical exploration of the wound with binocular loupe magnification showed a bifid median nerve with a persistent thin median artery running between the two nerve trunks...
2016: Journal of Long-term Effects of Medical Implants
Maryam Geramizadeh, Hamidreza Katoozian, Reza Amid, Mahdi Kadkhodazadeh
In this study, we aimed to design an ideal dental implant with respect to stress and strain patterns on the surrounding cortical and cancellous bones. The effects of static loading on dental implants have been previously assessed, but the impact of dynamic loading and fatigue analysis has not been well studied. We evaluated static, dynamic, and fatigue behaviors of dental implants to fully understand the mechanism and acquire a more realistic perspective of the process. In this study, we analyzed three models of a tapered dental implant: model 1 had V-shaped threads; model 2 had microthreads in the upper area and V-shaped threads in the rest of the body; model 3 had reverse buttress threads in all areas...
2016: Journal of Long-term Effects of Medical Implants
Brandon Levy, A Hanflik, E Bryk, V J Vigorita
In recent years, metal-on-metal (MoM) orthopaedic implants have been associated with significant adverse tissue reactions, prompting revision surgeries and recalls by manufacturers. Adverse tissue reactions consist of a wide range of pathologic findings but are generally characterized by a histiocytic reaction to metal debris, with or without an inflammatory response. Inflammation is generally that of a lymphocytic infiltration that prompts concern of an immune reaction. Only occasionally have eosinophils been documented-never as a marked infiltrate...
2016: Journal of Long-term Effects of Medical Implants
Sophie Merckaert, Stefan Hefer, Alain Akiki
Intramedullary nails have gained popularity for the treatment of intertrochanteric fractures. Cephalic screw cutout, non-union, nail breakage, intraoperative fractures, and peri-implant fractures are complications of these implants and have been well described. This case report describes an unusual complication in an 89-year-old woman presenting with a femoral neck fracture with an intramedullary nail in place without implant failure or non-union after having been successfully treated three years previously for an intertrochanteric fracture...
2016: Journal of Long-term Effects of Medical Implants
Amir Moeintaghavi, Hamid Reza Arab, Leila Jabbareh, Farid Shiezadeh, Morteza Taheri, Reza Shahmohammadi
Bone resorption after tooth extraction is a common problem in implant dentistry. Allografts are one of the therapeutic techniques used to reconstruct the deficient ridge. Although this technique eliminates the need for a surgical donor site, it has yielded contradictory results. The aim of the present pilot study was to evaluate the clinical and radiographic results of the use of demineralized freeze-dried cancellous block allografts (DFDCBAs) in lateral ridge augmentation. Seven patients were included in this study...
2016: Journal of Long-term Effects of Medical Implants
Bertrand W Parcells, Jared S Preston, Brian Culp, V Karthik Jonna, Alfred J Tria
Preservation of native knee anatomy may confer improved patient satisfaction, as suggested by patient satisfaction scores in unicondylar versus total knee replacement. Bicompartmental knee replacement (BKR) implants similarly promote native tissue preservation. We retrospectively reviewed 42 consecutive patients who underwent BKR from 2006 to 2007. Outcome measures were evaluated. At an average follow-up of 103 months (range 87-110), 34/42 (81%) of implants survived. Among the retained implants, the Knee Society Score (KSS) grade was excellent in 26/34 (76...
2016: Journal of Long-term Effects of Medical Implants
James Pritchett
Thinner and larger acetabular components are more stable and are useful for resurfacing. This study performed wear simulator tests of the largest polyurethane (PUR) and highly cross-linked polyethylene (XLPE) liners available. The results were compared with conventional polyethylene (ConvPE) to determine wear, survivorship, wear debris particles generated, and oxidative degradation. Two-piece acetabular components with a 4-mm poly liner, a 2-mm metal backing, and 1 mm of porous coating with an inner diameter of 51 mm were tested...
2016: Journal of Long-term Effects of Medical Implants
Christophe Nich, Yuya Takakubo, Jukka Pajarinen, Jiri Gallo, Yrjo T Konttinen, Michiaki Takagi, Stuart B Goodman
Normal usage of total joint replacements results in the production of wear debris and other byproducts. In particular, polyethylene particles are heavily involved in the stimulation of local and systemic biological reactions resulting in chronic inflammation, periprosthetic bone resorption (osteolysis), and eventually implant loosening. As sentinels of the innate immune system, cells of the monocyte/macrophage lineage initiate the inflammatory cascade that lead to osteolysis. The biological processes involved are complex, based on the unique properties of the monocytes/macrophages, including sensing, chemotaxis, phagocytosis, and adaptive stimulation...
2016: Journal of Long-term Effects of Medical Implants
Sudipto Majumder, Amit Roy Chowdhury, Subrata Saha
The aim of this study was relative variation quantification of the total electric field (EF) sum in a region very close to a dental root of the first molar tooth for two different materials: dentine (before implantation) and titanium (present in a screw after implantation), due to development of electrical charges generated by chewing force on the tooth. Because bone is a piezoelectric material, mechanical strain that is generated by chewing force on bone adjacent to the dental root produces electrical charges...
2016: Journal of Long-term Effects of Medical Implants
Zhuhua Zhang, Dawei Zhang, Osamu Katoh, Hongxu Liu, Wei Tian, Tengfei Li, Aiyong Li, Xin Hu, Xiaofeng Ma, Jian Dai, Chenxi Zhang, Eisho Kyo
Surgeons currently use two different wire-based approaches to recanalize coronary chronic total occlusion (CTO): antegrade and retrograde. It has been demonstrated that the retrograde approach has improved the procedural success rate, but it remains unclear whether the retrograde approach is better than the antegrade approach for the long term. In this study, we enrolled a total of 187 patients with a diagnosis of CTOs. We evaluated the baseline characteristics of these patients and performed percutaneous coronary intervention to treat their problems by using either antegrade or retrograde approaches and different techniques in both groups...
2016: Journal of Long-term Effects of Medical Implants
Mark Phillips, Judy Baumhauer, Sheila Sprague, Jon Zoltan
The use of noninvasive bone growth stimulators is a nonoperative treatment option for fracture nonunions. The purpose of this study was to evaluate the initial effectiveness of the combined magnetic field (CMF) bone growth stimulation in the treatment of fracture nonunions. Using data from a large nonunion fracture registry, we reviewed fracture-healing-outcome data and healing times for all patients treated with a CMF bone growth stimulator during a 4-yr period. Overall, 75% of the 2370 included patients achieved fracture union...
2016: Journal of Long-term Effects of Medical Implants
Mark Phillips, Brian Drew, Sheila Sprague, Ilyas Aleem
Vertebral fractures place significant burdens on patients, caregivers, and the healthcare system at large. Nonunion is a frequent complication following vertebral fracture treatment, often resulting in significant patient pain and morbidity. Bone growth stimulators are an adjunct treatment modality proposed to increase rates of fracture healing. Combined magnetic field (CMF) bone growth stimulators have specifically been shown to increase union rates in patients with vertebral fractures. Certain populations, such as the elderly, postmenopausal women, and smokers, have demonstrated a preferentially greater response to CMF treatment...
2016: Journal of Long-term Effects of Medical Implants
Mark Phillips, Jon Zoltan, Brad A Petrisor, Sheila Sprague, Judy Baumhauer
This study evaluated the effectiveness and safety of bone growth stimulation using combined magnetic field (CMF) for the treatment of fracture nonunions. In this prospective multicenter study, patients were assessed monthly for 9 mo, or until they demonstrated a healed nonunion, and were assessed at a final follow-up 3 mo after treatment completion. The primary outcome was the presence or absence of fracture healing at the nonunion site, determined by clinical and radiographic assessment. Enrolled in this study were 112 patients with 116 fracture nonunions...
2016: Journal of Long-term Effects of Medical Implants
Chandrika Shenoy, Hani Aodah Alzahrani, Adrian R M Upton, Markad V Kamath
Epilepsy is a neurological disorder that has been diagnosed in approximately 1% of the world's population. In North America alone, more than 3 million individuals suffer from epilepsy. Antiepileptic drugs are not fully effective in some patients, and most drugs have adverse side effects. Recently, several stimulation techniques (responsive neural, vagal nerve, transcranial magnetic, and deep brain) have been used as adjunct therapies to treat medically refractive seizures. Since its Food and Drug Administration approval in 2013, responsive neural stimulation (RNS), a closed-loop electrical stimulation system, has emerged as a potential therapeutic alternative to treat patients with epilepsy (PWE)...
2016: Journal of Long-term Effects of Medical Implants
Sara Soheilifar, Mohsen Bidgoli, Erfan Abbasi Atibeh, Javad Faradmal
BACKGROUND: One of the most common complications of implant surgery is wound dehiscence followed by exposure of the implant to the oral cavity. The aim of this study was to radiographically analyze crestal bone loss around bone-level implants with wound dehiscence between the first- and second-stage surgeries. METHODS: The records of 136 implants inserted during 2013-2014 were evaluated. Patients with no history of systemic disease, drug addiction, radiotherapy, or chemotherapy were selected...
2016: Journal of Long-term Effects of Medical Implants
Ulrich M Rieger, Gabriel Djedovic, Alexander Pattiss, Gregor F Raschke, Reno Frei, Gerhard Pierer, Andrej Trampuz
Polyurethane-coated breast implants seem to be associated with lower medium- and long-term capsular contracture rates in comparison to textured or smooth implant surfaces. Although the etiology of capsular contracture is uncertain, bacterial biofilms have been suggested to trigger chronic peri-implant inflammation, eventually leading to capsular contracture. It is unknown whether polyurethane-coated implants are less prone to biofilm colonization than other implant surfaces. We extracted data from patient records included in a prospective cohort between 2008 and 2011...
2016: Journal of Long-term Effects of Medical Implants
Mariya Tohfafarosh, Alex Sevit, Jasmine Patel, Jonathan W Kiel, Arnold Greenspon, Jordan M Prutkin, Steven M Kurtz
Success of pacemakers and implantable cardioverter defibrillators may be limited by premature lead failure. Lead insulation polymers, such as polyurethane (PU) and polydimethylsiloxane (PDMS), are reported to degrade over time in vivo. PU is known to undergo oxidation, whereas PDMS undergoes surface hydrolysis. Previous studies have characterized polymer degradation in vitro, in animals or in short-term human study; however, complex effects of the biochemical and mechanical environment on the lead insulation can only be fully understood by evaluating long-term-implanted leads...
2016: Journal of Long-term Effects of Medical Implants
Amir Moeintaghavi, Hamidreza Arab, Farid Shiezadeh, Amirhossein Moradi, Mehrdad Radvar, Kazem Fatemi
The aim of the present study was to evaluate alveolar crest changes when using demineralized freeze-dried bone allograft (DFDBA) and resorbable membrane between flap and buccal bone in addition to filling the gap, as compared to merely filling the gap, when performing immediate implantation. In 18 patients with 24 single-root teeth, implants were placed immediately after extraction. In the test group (nine patients with 12 teeth), DFDBA and barrier membrane were placed between buccal crest and flap after implant placement...
2016: Journal of Long-term Effects of Medical Implants
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