Ultrasonography and clinical outcome comparison of extracorporeal shock wave therapy and corticosteroid injections for chronic plantar fasciitis: A randomized controlled trial

Ta-Wei Lai, Hsiao-Li Ma, Meng-Shiunn Lee, Po-Ming Chen, Ming-Chou Ku, Ta-Wei Lai, Hsiao-Li Ma, Meng-Shiunn Lee, Po-Ming Chen, Ming-Chou Ku

Abstract

Objectives: Extracorporeal shockwave therapy (ESWT) and corticosteroid injection (CSI) are treatment options for plantar fasciitis. Their clinical outcome comparison remains a debate. Also, the thickness changes of the plantar fascia on objective evaluation under the medium energy ESWT and CSI therapy are elusive.

Methods: A total of 97 patients with chronic plantar fasciitis were enrolled in the randomized prospective trial. Forty-seven patients received extracorporeal shock wave therapy (ESWT), and fifty patients received corticosteroid injection (CSI). The thickness of the plantar fascia was evaluated respectively before ESWT and CSI, and at the 4th and 12th week after ESWT and CSI by ultrasonography. Pain level and clinical outcomes were recorded using visual analogue scale (VAS) and 100-points scoring systems. Correlation analysis was performed between the thickness change and clinical outcome.

Results: Under ultrasonography, we observed more increase of plantar fascia thickness of ESWT group than CSI group at 4th week (p=0.048). VAS of plantar fasciitis patients receiving ESWT was lower than those who received corticosteroid injection (0.001 and p⟨0.001, at 4th and 12th week). On the assessment of 100-points scoring systems, the pain level of patients with ESWT was lower than those with CSI at the 12th week (p⟨0.001). On the other hand, the increase of plantar fascia thickness at 4th week was positively correlated with the decrease of VAS score at 12th week follow-up (R=0.302, P=0.039).

Conclusions: At 4th week after treatment, the thickness of plantar fascia increased. Then it decreased gradually, but not to the baseline at 12th week. On the pain level outcome at 12th week, extracorporeal shockwave therapy (ESWT) was more efficient than corticosteroid injection (CSI) on chronic plantar fasciitis. The more change of plantar fascia after ESWT, the more efficient on clinical outcome.

Conflict of interest statement

The authors have no conflicto of interest.

Figures

Figure 1
Figure 1
(A) The ultrasonographic trend of thickness changes of plantar fascia in the extracorporeal shockwave therapy (ESWT) and corticosteroid injection (CSI) groups. (B) (C) (D) Representative patient of ESWT-induced thickness of plantar fascia were examined by ultrasonography at 0, 4-week, and 12-week follow-up. The thickness of plantar fascia increased at first month after ESWT, than decreased at 3rd month after treatment. PF: plantar fascia.
Figure 2
Figure 2
(A) The visual analog scale (VAS) score and (B) 100-points scoring systems change for plantar fascia in the extracorporeal shock wave therapy and corticosteroid injection groups at 0, 4-week, and 12-week follow-up (*, P<0.05; **, P<0.01; ***, P<0.001).

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