The top of any structure is never as stable as its base. Every tower or skyscraper has some give to it at the very top, especially on a windy day.
The human spine follows this principle, as well.
The C1 vertebra (aka atlas) is the only bone in the spine not connected to the one below it or above it by an intervertebral disc. Above the C1 is the skull.
The absence of a disc between C1 and C2 allows the atlas much more movement. In fact, the majority of head rotation occurs at the top of the spine.
So it should come as no surprise that the atlas can misalign very easily. This causes the C2 to compensate, then C3, and so on and so forth all the way down the spine. Outwardly, you may he able to tell in the mirror if you see your head and/or shoulders tilted one way or the other.
It should also come as no surprise that the pelvis will misalign as well. One side of the pelvis rocks back while the other rocks forward, causing one side to be higher than the other. The leg on the high side of the pelvis will be shorter.
This is often mistaken by others as an anatomical leg length difference (something you’re just born with) as opposed to a simple clue to a larger problem (C1 subluxation, compensatory misalignments, and a total postural imbalance).
None of us like to speed up the aging process, so make it a point to have your spine checked and adjusted. It’s just too important to neglect.