Limb lengthening and deformity correction in children with abnormal bone.

Flexible intramedullary nailing (FIN) provides multiple advantages in limb lengthening and progressive deformity correction in combination with external fixation. The article presents brief literature review and authors' experience in limb lengthening of abnormal bone (Ollier's disease, fibrous dysplasia, osteogenesis imperfecta). Titanium and, especially, hydroxyapatite-coated bent elastic nails in combination with external fixator are appropriate in limb lengthening of abnormal bone in children. FIN left in situ after lengthening procedure and external frame removal should be applied for long-term reinforcement of lengthened bone in patients with abnormal bone (metabolic bone disorders, skeletal dysplasias with compromised bone tissue development). The FIN respects bone biology, which is mandatory for good bone consolidation. Osteoactive properties of intramedullary elastic implants are favorable for bone formation and as well as for stable position of nails without risks of migration in long-term follow-up.