Saber shin

Saber shin is a malformation of the tibia. It presents as a sharp anterior bowing, or convexity, of the tibia.

Causes
Periosteal reaction along the shaft of the tibia. It can result from congenital syphilis, yaws, Paget's disease of bone, vitamin D deficiency or Weismann-Netter–Stuhl syndrome. It can be due to osteomalacia.

Prognosis
The bone looks like a boomerang from an early age.

Etymology
Saber refers to the tibia's resemblance to the curve of a saber sword.