Rheumatoid Arthritis Quiz

#10. A patient with a pathological fracture undergoes bone biopsy. Histology shows haphazardly arranged collagen fibres. This pattern is always abnormal in adults because it indicates:

1. Lamellar bone re-modelling
2. Primary spongiosa
3. Endochondral ossification
4. Woven bone formation

Your Answer (0–5):

Peak bone mass is achieved when?

A) At puberty
B) Early adulthood after cessation of skeletal growth
C) At age 40
D) During the third decade

Your Answer (0–5):

The skeleton accounts for 12% of body weight. A patient weighs 68 kg. What is the weight of the skeleton in kg?

Your Answer:

Hydroxyapatite stores 99% of body calcium and 85% of body phosphorus. If total body phosphorus is 600 g, how many grams are stored outside bone?

Your Answer:

Osteoid is 35% of bone matrix. If the mineral component of a bone sample weighs 13 g, what is the total weight of the bone sample in grams?

Your Answer: