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PubMed · 7867978

[External fixation in reconstructive hand surgery].

I Matev
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Abstract

Over the last two decades, a new type of treatment has been established in reconstructive surgery of the hand. By means of an external fixator used as a distraction device, thumb and fingers are reconstructed. Used as a compression device, the external fixator accelerates the treatment of pseudarthroses, posttraumatic deformities, chronic osteomyelitis and healing following arthrodesis in the hand. There is no universal external device for the hand. Each part of the hand needs a specific fixator. Two basic questions require further studies: Improvement of the external fixators. Acceleration of the callus formation in the distraction method.

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External FixatorsFracture HealingHand Deformities, AcquiredHand InjuriesHumansMotor SkillsOsteomyelitisPostoperative ComplicationsPseudarthrosisRadiographyRange of Motion, ArticularThumbJournal Article

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I Matev. 1994. [External fixation in reconstructive hand surgery].. https://pubmed.ncbi.nlm.nih.gov/7867978/

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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.

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