This condition is very rare. There is congenital abnormality of the bone in the lower half of the tibia (Fig. 11.1) and it is usually a pronounced anterior bowing of the tibia with a resultant fracture. This fracture is extremely resistant to treatment by the usual methods.
Iyer, K. M. (2013). The leg. In Orthopedics of the Upper and Lower Limb (pp. 121–124). Springer-Verlag London Ltd. https://doi.org/10.1007/978-1-4471-4447-2_11