Novel Intramedullary nail controls axial interfragmentary motion, heals tibial fracture: Study
In the past animal and human studies have demonstrated the benefit of controlled interfragmentary motion on fracture healing. One such study recently published in the Journal of Orthopaedic Research highlighted a novel intramedullary nail capable of controlled axial interfragmentary motion which may potentially enhance fracture healing.
The authors from the Department of Surgery, Creighton University School of Medicine, Phoenix, Arizona, USA quantified interfragmentary motion and load transfer in tibial fractures fixed using a novel intramedullary nail (IMN) that allows controlled axial motion.
A total of fifty composite tibias with various fracture patterns were utilized for the research. For all test conditions, two interlocking screws were used to fix the nail in the proximal metaphysis, and two interlocking screws through the distal metaphysis, explained Navid Ziran, the lead authors of the study.
The nail allowed either no motion (static mode) or 1 mm (dynamic mode) of cyclic axial motion between the two fracture fragments for every fracture pattern tested. As expected, strain shielding was more prominent under static nail conditions.
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