What causes clinodactyly?

What causes clinodactyly?

An abnormally shaped bone in your finger causes clinodactyly.

There are usually three bones (phalanges) in your second (index or pointer), third (middle), fourth (ring) and fifth (pinky) digits. The bones stack on top of each other, forming two joints. Sometimes the bone in the middle of your finger, between your middle knuckle and the furthest knuckle from your wrist (distal), grows in the shape of a wedge (trapezoid or triangle) instead of growing in the shape of a rectangle. When the bone grows incorrectly, the bones can’t stack in a straight line, which gives your finger a curve at its end.