Metabolic Bone Diseases
All the following are radiological features of rickets except (AIIMS May 2010)
|A||Delayed appearance of the epiphysis|
|B||Widening of the epiphyseal plate|
|C||Calcification of the sacra iliac ligament|
|D||Flaring of the metaphyseal cortices outward (trumpeting)|
Calcification of the sacra iliac ligament
a. Normal width of the epiphyseal plate is 2-4 mm. In rickets it is increased because of excessive accumulation of uncalcified osteoid at the growth plate.
b. Normally the metaphysis meets the epiphyseal plate as a smooth line of sclerosis = (zone of provisional calcification). In rachitic bones this line is absent and the metaphyseal end appears irregular.
c. The cartilage cells that accumulate at the growth plate create a depression in the soft metaphyseal end giving rise to a cup shaped appearance.