The Telescopic Nail is an intramedullary implant system designed for stable osteosynthesis of femur and tibia in pediatric patients with bone fragility, such as Osteogenesis Imperfecta. It enables longitudinal bone growth by allowing the implant to extend as the bone grows. The system includes a telescopic nail and a stabilizing sleeve, locked by self-tapping screws, providing durable fixation and minimizing the need for reoperation.