The hyoid bone is [the only] free floating bone in the body, suspended only by ligaments and muscles. That means a) its position is likely affected by gravity, and possibly distances between the corns and the spine change between lying supine, prone, and standing upright, b) the muscles can stretch and contract, temporarily (swallowing) or permanently (stiffness, looseness).
As long as there are no solid attachments (e.g. badly calcified ligaments), the hyoid bone has quite a lot of range of motion (again, itâs not attached through any joint - just soft tissue, which is deformable.)
Therefore Iâm not fully buying into âhyoid syndromeâ and âclicking hyoidâ as contradictory to the styloid processes, attached to the skull, the hyoid boneâs position potentially might be changed using soft tissue forming techniques.
Note, additional stiffness might develop between the thyroid cartilage (which also sometimes calcified as the person gets older), and become more like a unified structure moving together, though often retaining a âsoftâ link between the hyoid bone and the [calcified] thyroid cartilage.