the first x ray is the trident hand of a child while the second is the trident hand of the adult .
question : trident hand is seen which of the following conditions ?
a. mucopolysaccaridosis
b. achondroplasia
c. diaphyseal achlasia
d. chondrodysplasia
answer : b. achondroplasia .
other abnormalities of achondroplasia are :
1. square iliac wings
2. champagne glass pelvic cavity
3. short, narrow sacrosciatic notch
4. posterior scalloping of vertebrae
5. small funnel shaped foramen magnum
