saber shin saber shin saber shin is a malformation of the tibia. it presents as a sharp anterior bowing, or convexity, of the tibia. saber shinsaber shin in congenital syphilisspecialtyorthopedics causes saber shin in late tertiary yaws 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.