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Francesco Prada, Andrea Franzini, Shayan Moosa, Frederic Padilla, David Moore, Luigi Solbiati, Francesco DiMeco and Wynn Legon

materials have been tested for this purpose, including multiple plastics and ceramics. 4 , 15 , 34 , 43 In these studies, materials were tested mostly for delivering US with therapeutic aims, such as for the ablation of intracranial tumors, whereas intracranial diagnostic imaging applications have had little consideration. In the present study, we use an implantable biocompatible polyolefin-based prosthesis (TM, In.Tra.) as a medium to transmit US into the intracranial space with minimal distortion for imaging and therapeutic purposes. In the first phase of the study, we

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Kazuya Nagata, Tomio Sasaki and Norihiko Basugi

S ince the report of Jannetta, 2 microvascular decompression has been widely used for the treatment of hemifacial spasm and trigeminal neuralgia. In some cases, symptoms may recur after the operation, or residual vasospasm may be observed for 2 to 4 weeks postoperatively. 1 In such cases, dislocation of the prosthesis may be the cause of the problem; however, this cannot be ascertained without reoperation. A radiopaque synthetic sponge has been developed to overcome this disadvantage. Description and Use of the Device The x-ray-detectable absorbent

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Keiro Ono and Koichi Tada

A crylic plastic was first used for vertebral replacement in cases of metastatic disease of the spine by Scoville, et al. , 5 as a palliative technique. A more simple and durable fixation, however, is still being sought. We are reporting four cases in which a metal prosthesis was inserted in the spine and anchored in place by acrylic cement. No serious tissue reaction to the acrylic cement was noted, in accordance with reports on previous studies. 1–3 Materials and Methods The prosthesis * has a quadrilateral cylindrical form with a window in the

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Cristian Gragnaniello, Kevin A. Seex, Lukas G. Eisermann, Matthew H. Claydon and Gregory M. Malham

T he Maverick lumbar disc prosthesis (Medtronic Inc.) was introduced in January 2002 (approved for implantation in Europe in December 2001), and since then 15,000 prostheses have been implanted worldwide. The Maverick has a ball-and-socket design with a fixed posterior center of rotation and is made of cobalt-chromium-molybdenum metal plates covered with hydroxyapatite at the bone-prosthesis interface. The superior and inferior endplates have keels to resist translation forces and are coated with an acid etching of the cobalt chrome followed by a high

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Sanjiv Bhatia, Peter R. Bergethon, Susan Blease, Thomas Kemper, Arthur Rosiello, Guy P. Zimbardi, Carl Franzblau and Edward L. Spatz

The choice of an appropriate material for replacement of the dura has posed a problem for the greater part of this century. This study investigates the biocompatibility of hydroxyethylmethacrylate (HEMA) hydrogel in vivo and its use as a dural prosthesis. This hydrogel has been shown to be nontoxic and durable and has been used in cell culture systems and contact lenses. 7, 11, 31 Hydrogels made from poly-HEMA are inexpensive, available in many sizes, easily sterilized, and flexible, and they have a smooth surface. Materials and Methods Manufacture of

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Dong-Hyun Kim, Kyeong-Sik Ryu, Moon-Kyu Kim and Chun-Kun Park

knowledge of the spine's functional anatomy and biomechanics. Two of the main concerns with this procedure are whether the disc replacement prosthesis demonstrates actual motion in vivo and maintains or improves sagittal alignment, and whether the achievement of physiological segmental motion after TDR relates to a good surgical outcome at long-term follow-up. The purposes of this prospective study are to quantify radiographically the segmental ROM of the ProDisc II pros-thesis at the affected and adjacent segments, to evaluate the relationship between the clinical

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Cédric Barrey, Thomas Mosnier, Jérôme Jund, Gilles Perrin and Wafa Skalli

degeneration at the adjacent disc levels in 92% of cases and reported a 6.1% reoperation rate at late follow-up after ACDF. According to several studies evaluating different prosthesis designs, early clinical results after arthroplasty share some similarities, in terms of pain relief and safety, with ACDF. 1 , 2 , 12 , 15 , 28 Because cervical TDR is a relatively new treatment, the major concern today is to obtain a better definition of the indications for this procedure. With this in mind Pracyk and Traynelis 29 recently compiled a wide range of indications in an

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Mårten E. Brelén, Patrick De Potter, Michel Gersdorff, Guy Cosnard, Claude Veraart and Jean Delbeke

O ne means of recreating useful visual sensations in certain types of blindness involves artificially stimulating the visual system with a prosthesis. The first such device, which stimulated the visual cortex using an array of surface electrodes, was developed in the late 1960s. 2 Since then, electrode arrays have been implanted subretinally, 4 epiretinally, 9 , 10 around the optic nerve, 15 or have been embedded in the visual cortex 2 , 6 in long-term studies in humans. For a review of this topic see the reports by Margalit, et al., 12 Veraart, et

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Grégoire P. Chatain and Michael Finn

, a customized 3D-printed sacral prosthesis was prepared for a salvage reconstruction surgery. FIG. 1. Preoperative sagittal ( A ) and axial ( B ) postcontrast T1-weighted MR images reveal that the mass is centered at the S2 and S3 segments with cortical breakthrough posteriorly and invasion of the epidural space. The mass extends superiorly in the spinal canal along the posterior margin of the S1 vertebral body. The mass is separate from the S1 sacral nerve roots but invades both the left and right S2 sacral foramina. FIG. 2. Lumbar spine radiographs

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Jan Goffin, Johan van Loon, Frank Van Calenbergh and Bailey Lipscomb

T he inclusion of patients for the first prospective multicenter trial using the Bryan Cervical Disc Prosthesis (Medtronic) for the treatment of patients with single and bilevel degenerative disc disease of the cervical spine was initiated in Europe on January 5, 2000, and was concluded in April 2001. The clinical 1- and 2-year results of this trial have been published and were satisfactory in comparison with short- and intermediate-term clinical outcomes associated with ACDF reported in the literature. 5 , 7 Since 2002, Bryan discs have been implanted