Automated 24-hour control of distraction forces: a new technology for limb lengthening

Introduction The classic Ilizarov technology of transosseous distraction osteosynthesis provides rigid fixation, accurate bone control in frontal and sagittal planes addressing all types of deformities and the limb length. Long-term Ilizarov fixation can be associated with adverse events and distraction forces are to be monitored. A new technology for limb lengthening using automated 24-hour control of distraction force facilitates optimal rate of deformity correction and can reduce Ilizarov fixation when combined with intramedullary titanium pins with a bioactive coating. The objective was to demonstrate continuous distraction force control technology in the correction of varus deformity of the tibia and anatomical lengthening. Material and methods Simultaneous tibial lengthening and correction of tibial deformity was produced with a new automated distractor (patent RU No. 2763644) measuring forces of the external fixation device every time with the gearbox switching on. Results and discussion Continuous distraction force control was well illustrated in an Ilizarov patient treated with combined distraction osteosynthesis. The use of the device was associated with a shorter bone consolidation time (IO = 15 days/cm) after sequential distraction osteosynthesis with genu varum eliminated and the bone lengthened. Conclusion Dynamic distraction force control with a new automated device allowed for monitoring the lengthening process, identifying potential complications, adjusting the distraction rate, reducing osteosynthesis time by two to four times.