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PubMed · 2216538

Organizing and implementing an Ilizarov program.

Abstract

The Ilizarov external fixator has made a profound impact on orthopaedic science. With its circular design, it allows correction of three-dimensional deformities including rotation, angulation, translation, shortening, and widening, as well as lengthening and soft tissue defects. Because this device is largely patient centered and patient operated, it has presented a new challenge and career investment for the orthopaedic nurse. A comprehensive Ilizarov program is necessary to address the total patient and his multiple needs in any facility where the Ilizarov method of treatment is adopted. The Ilizarov program is a multidisciplinary team approach that provides a structure for administering and providing total patient care for the Ilizarov patient and his significant other(s).

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BibTeXRIS

P R Jauernig. Organizing and implementing an Ilizarov program.. https://doi.org/10.1097/00006416-199009000-00008

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Safety evaluation of large external fixation clamps and frames in a magnetic resonance environment.

Large orthopedic external fixation clamps and related components were evaluated for force, torque, and heating response when subjected to the strong electromagnetic fields of magnetic-resonance (MR) imaging devices. Forces induced by a 3-Tesla (T) MR scanner were compiled for newly designed nonmagnetic clamps and older clamps that contained ferromagnetic components. Heating trials were performed in a 1.5 and in a 3 T MR scanner with two assembled external fixation frames. Forces of the newly designed clamps were more than a factor 2 lower as the gravitational force on the device whereas, magnetic forces on the older devices showed over 10 times the force induced by earth acceleration of gravity. No torque effects could be found for the newly designed clamps. Temperature measurements at the tips of Schanz screws in the 1.5 T MR scanner showed a rise of 0.7 degrees C for a pelvic frame and of 2.1 degrees C for a diamond knee bridge frame when normalized to a specific absorption rate (SAR) of 2 W/kg. The normalized temperature increases in the 3 T MR scanner were 0.9 degrees C for the pelvic frame and 1.1 degrees C for the knee bridge frame. Large external fixation frames assembled with the newly designed clamps (390 Series Clamps), carbon fiber reinforced rods, and implant quality 316L stainless steel Schanz screws met prevailing force and torque limits when tested in a 3-T field, and demonstrated temperature increase that met IEC-60601 guidelines for extremities. The influence of frame-induced eddy currents on the risk of peripheral nerve stimulation was not investigated.

External Fixators↗