July 2013


World Journal of Orthopaedics

intersected ( C ) and a indicate at 3.5 millimeter ( 2 millimeter guard distance from articular surface + 1.5 millimeter radius of PIS ) back tooth from luff A ( B ). We calculated the fish of screws inserted from point D through to point B in relation to D-C and B-C. In addition, an eccentrically aligned screw was inserted at a criterion 20° through the anterior lens cortex of the ulna in each bone and the articular surface was observed macroscopically for any damage. The bastardly A-C distance was 9.6 millimeter ( mean ± SD, 9.600 ± 0.763 millimeter ), A-B distance was 3.5 millimeter, C-D distance was 12.500 millimeter ( 12.500 ± 1.371 millimeter ) and the bastardly lean was 25.9° ( 25.9° ± 2.0° ). lack of articular damage was confirmed macroscopically in all bones after the 20.0° eccentrically aligned screws were inserted. Intramedullary nail arrested development systems have well known biological and biomechanical advantages for osteosynthesis. however, equally well as these long-familiar advantages, IMN obsession of the ulna has some limitations. Some important limitations are related to the proximal engagement of the ulna breeze through. The placement of the PIS itself limits the indications for which intramedullary systems can be selected as an plant for the ulna. The new PIS blueprint, where the PIS is aligned 20°eccentrically to the pinpoint body, allows fixate of fractures even at the level of the olecranon without disturbing the joint. It besides allows the eccentrically aligned screw to be inserted in any commission except through the proximal radio-ulnar joint. Taking into consideration our results, we immediately use a 20° eccentrically aligned PIS for all ulna. In our results, the fish required to insert the PIS was less than 20° for entirely one cram. however, 0.7° remainder corresponds to placement of the fuck only 0.2 mm closer to the articular open. As we assume 2.0 millimeter to be a safe distance, a placement of the screw 0.2 millimeter near to the articular coat may not produce any clinical symptoms. The new PIS may give us the opportunity to interlock IMN without articular damage and confirmation by fluoroscopy if the complete is manufactured with a PIS aligned at a 20.0° fixed angle in relation to the IMN.

To define the optimum safe angle of use for an eccentrically aligned proximal interlacing screw ( PIS ) for intramedullary smash ( IMN ). thirty-six dry cadaver ulnas were split into two adequate pieces sagitally. The be points were identified for each ulna : the deepest point of the incisure olecrani ( A ), the point where perpendicular lines from A and the ideal IMN entrance compass point ( D ) are … [ Show full abstract ]

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