Using heel lifts to level a pelvis causes lateral translation of the lumbar spine. That is, changes made to your feet effect the rest of your body, especially your spine. Some changes occur within days, others can take months as muscles, ligaments, joints and bones adapt to the new symmetry of the pelvis.
Given the long-term loading, the lumbopelvic structure may be expected to adapt via Heuter Volkmanns’ law [which proposes that growth is retarded by increased mechanical compression, and accelerated by reduced loading in comparison with normal values…The gross effect of growth modulation has been demonstrated qualitatively and semi-quantitatively. Sustained compression of physiological magnitude inhibits growth by 40% or more.”]
To measure leg imbalances and track changes take erect x-rays to determine leg imbalances. This is the most reliable and accurate method. External analysis and physical appearance can be misleading.”