Novel Low Cost Telescopic Nail available for Long Bone Fracture Treatment in Osteogenesis Imperfecta Children
Telescopic nailing and intermittent doses of bisphosphonates are now considered the standard treatment for preventing long bone pathological fractures in osteogenesis imperfecta (OI) children. Even though the telescopic nail designs have evolved over time, we are yet to get an affordable, worldwide uniformly and easily available, surgeon-friendly telescopic nail with good rotational stability.
Karthick Rangasamy et al designed a telescopic nail with modifications in Küntscher nail (outer, hollow component) and square nail (inner, solid component). The distal end of the square nail has a slot to allow locking in the distal epiphysis using a threaded K wire. The interlocking geometry between the two nails allows reasonable rotational control while allowing only longitudinal movements. This novel, low-cost, rotationally stable telescopic nail design is a good alternative to existing telescopic nails in the market, especially for children from low and middle-income countries (LMIC) where affordability and uniform availability are a concern.
Design of the implant:
The telescopic nail design consists of a Küntscher nail which acts as an outer hollow (female) component, and an ulnar square nail which acts as an inner solid (male) component.
Solid component: The configuration of a square nail within a clover-leaf nail imparts rotational stability to some extent due to the interlocking geometry/ design. The distal end of the nail is modified, and it is flattened to accommodate a distal locking slot to allow a passage of 1.6 mm Kirchner (K) wire.
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