Functional vs. structural is whether a difference, such as leg length, comes from soft tissue and habit, which can change, or from bone, which cannot.
In 📝Postural / Structural Realignment the practitioner treats an apparent short side as a pattern first: a pelvis that is rotated, a hip that will not extend, a foot that collapses. Those can shift with tissue and options. A bony difference does not. This is a working lens, not a medical determination and not a claim to have measured true skeletal length. Imaging and a licensed clinician own that question when it matters.
Clients often arrive sure one leg is short. The useful test is whether the difference changes when the pattern changes — lying versus standing, after work versus before — not a promise to even the bones.
This work does not correct a structural lesion.