These ontogenic changes in bone size and amount are clearly dependent on serum IGF-1 levels as liver IGF-1 deficient (LID) mice, with 75% reductions in serum IGF-1 from birth, exhibit only ∼6% decreases in bone length but significant reductions (∼30%) in bone mineral density (BMD), Tt.Ar, and Ct.Ar by the middle of the late growth phase (8 weeks) [15].
Scientists often invoke adaptations to a changing climate and environment to explain morphological changes such as bone size and shape in hominids.
An older study that utilized radiological assessment of the bone density in the second metacarpal of normal women and those with pregnancy induced hypertension using the microdensitometry method showed subtle changes in the bone size and densities at various gestations of the pregnancies, but were unable to show a clear-cut difference in the BMD between the tow groups [ 10].
It uses what are known as logarithmic transformations to cope with changes in the relationship between bone size and weight.
The main outcome measures included new bone size and its bone mineral density (BMD).
The analysis of change in medial cartilage volume was repeated with further adjustment for age, sex, body mass index, medial tibial bone size, and magnetic resonance imaging machine.
DXR MCI is defined as the combined cortical thickness divided by the bone width and is a relative bone measure independent of bone size and bone length.
However, these differences decreased in magnitude after adjustment for differences in baseline BMI (14 to 22%), knee pain (12 to 19% for change in medial and total cartilage defects), corresponding bone size (11 to 38%) and changes in corresponding cartilage volume (44 to 58%).
This may be related to the fact that BMD does not capture many factors that influence bone strength, such as bone size, bone geometry, and microarchitecture change [ 48].
Factors that affect bone strength include bone size (geometry) and bone density (vBMD).
