In this study, the efficiency of continuous high-power ultrasound was assessed for plantar fasciitis treatment. Twenty two individuals were assessed, reporting pain lasting more than six months, through a functional questionnaire and visual scale for pain at the first morning load. Twenty seven feet were distributed into two groups: group 1 (stretching + ultrasound turned off) and group 2 (stretching + 2 w/cm 2 ultrasound). After 15 treatment sessions, an analysis of the absolute values and improvement percentages for collected variables was performed. A functional improvement was seen for both groups, with no difference between them. The analysis of the absolute values for pain intensity (at first, eighth, and last session) showed similarity between groups. The improvement percentage for 15 sessions did not present differences between both groups. That percentage was also calculated for two periods (before and after the eighth session). It was noted that the improvement percentage on all 15 sessions for group 2 (46.5%) was inferior to the percentage of the first eighth sessions for group 1 (54.6%). Thus, the high-power continuous ultrasound did not add value for function and pain; additionally, only specific stretching exercises were efficient in reducing more than 50% of the pain in chronic plantar fasciitis.143137140Whiting, W.C., Zernicke, R.F., Lesões das extremidades inferiores (2001) Biomecânica Da Lesão Musculoesquelética, p. 161. , Whiting WC, Zernicke RF. Rio de Janeiro: Guanabara KooganRoxas, M., Plantar fasciitis: Diagnosis and therapeutic considerations (2005) Alt Med Rev, 10, pp. 83-93Carvalho Jr., A.E., Imamura, M., Moraes Filho, D.C., Talalgias (2003) Ortopedia e Traumatologia: Princípios e Prática, pp. 550-556. , Hebert S Xavier R. Porto Alegre: Artes MédicasPfeffer, G., Bacchetti, P., Deland, J., Lewis, A., Anderson, R., Davis, W., Comparison of custom and prefabricated orthoses in the initial treatment of proximal plantar fasciitis (1999) Foot Ankle Int, 20, pp. 214-221Schepsis, A.A., Leach, R.E., Gorzyca, J., Plantar fasciitis. Etiology, treatment, surgical results and review of the literature (1991) Clin Orthop, 266, pp. 185-196Hyer, C.F., Vancourt, R., Block, A., Evaluation of ultrasound-guided extracorporeal shock wave therapy (ESWT) in the treatment of chronic plantar fasciitis (2005) J Foot Ankle Surg, 44, pp. 137-143Ogden, J.A., Alvarez, R.G., Marlow, M., Shockwave therapy for chronic proximal plantar fasciitis: A metanalysis (2002) Foot Ankle Int, 23, pp. 301-308Hong, C.-Z., Chen, Y.-C., Pon, C.H., Yu, J., Immediate effects of various physical medicine modalites on pain threshold of an active myofascial trigger point (1993) J Musculoskeletal Pain, 1 (2), pp. 37-53Scott, P.M., (1971) Clayton's Electroterapia Y Actinoterapia, , Barcelona: Editorial JinisKitaoka, H.B., Alexander, I.J., Adelaar, R.S., Nunley, J.A., Myerson, M.S., Sanders, M., Clinical rating systems for the ankle - Hindfoot, midfoot, halux, and lesser toes (1994) Foot Ankle Int, 15, pp. 349-353Davis, P., Severus, E., Baxter, D., Painful heel syndrome: Results of nonoperative treatment (1984) Foot Ankle Int, 15, pp. 531-534Imamura, M., Carvalho Jr., A.E., Fernandez, T.D., Leivas, T.P., Kaziyama, H.H., Ferraz, T.B., Fascite Plantar: Estudo comparativo (1996) Rev Bras Ortop, 31, pp. 561-566Crawford, F., Atkins, D., Edwards, J., Interventions for treating plantar heel pain (2002) Cochrane Library, (4). , www.cochrane.bireme.br/cochrane/main.php?lang=ptCrawford, F., Snaith, M., How effective is ultrasound in the treatment of hell pain? (1996) Ann Rheum Dis, 55, pp. 265-267Chen, H., Wang, C., Huang, T., Shockwave therapy for patients with plantar fasciitis: A one-year follow-up study (2002) Foot Ankle Int, 23, pp. 204-207