Plantar Fasciitis is a common symptom resulting from abnormal foot pronation.
Abnormal foot pronation occurs both the Rothbarts Foot and the PreClinical Clubfoot Deformity.
A Randomized Single Blinded Trial (Landorf et al, 2006) concluded that, long term, both prefabricated and custom orthoses are no more effective in treating Plantar Fasciitis than a sham device.
In my clinical practice, I have found proprioceptive therapy to be very effective in resolving Plantar Fasciitis when secondary to either the Rothbarts Foot or the PreClinical Clubfoot Deformity.
Landorf KB, Keenan AM, Herbert RD 2006. Arch Intern Med. 166:1305-1310.
Rothbart BA 1971. Heel spur and heel spur syndrome. Journal American Podiatric Medical Association(JAPMA), 61(5):186-9.