In patients with mortar and pestle finger, the ends of the fingers or toes are seen to be hyperplastic and hypertrophied, with a pestle-like enlargement. Measurement of pestle finger, first of all, you can look at the shape of the finger, typical pestle finger, the shape of the tip of the finger changed significantly, due to the different distribution of the swollen soft tissue, the end of the toes can show a different shape. Secondly, you can measure the upper angle of the nail. In normal people, the upper angle of the nail is less than or equal to 160 degrees, while the upper angle of the nail in pestle-shaped finger is more than or equal to 180 degrees. Finally, you can touch the pestle finger and press the nail, the proximal nail base tissue feels as if the nail is on a sponge cushion, and can be easily pressed down.