Die distale Unterschenkelverriegelungsnagelung: eine statische Prüfung

Study Aim: The aim of this study (trial) was to examine the stability of two interlocking nail systems, first the UTN® (Mathys) with the option of interlocking two times from the medial site and simple from ventral site and second the Targon® rod (Aesculap) that offers three options for interlocking from the medial site. Interlocking from ventral site always carries the possibility of injury to nerves, tendons, and vascular structures. On the other hand, a higher degree of looseness of the pin of the bolting device always results in more instability. To what degree is interlocking necessary in two planes? Methods: We tested two intramedullary interlocking systems in 8 cadaveric bones using the Schenkel-Trebel machine. Results: We found that the looseness of the pin of the bolting system but not the rod position is critical for the fragment stability. The interlocking should be thus theoretically possible using a fitting rod system with stable angles.