Answer
Throughout adolescence, it involves changes in stress associated with sex steroids and muscle growth. Sex steroids affect bone deposition, a lack of bone remodeling during the adolescence stage would keep bones in preadolescence stage. Also, bones would retain a thinner and less dense appearance than what would be expected.
Work Step by Step
Here is a picture of the stages of a long bone from fetus to adolescence. Take note of the last two bones.