Effects of interferential current in psoriatic arthritis:

Interferential current (IFC) was suggested to improve the skin manifestations of psoriasis vulgaris, possibly by enhancing the intracellular concentration of cyclic AMP.
Walker UA et al assessed the efficacy of IFC on psoriatic arthritis. Nine consecutive patients were analyzed at baseline and after 16 weeks of IFC therapy. Bipolar IFC was applied twice daily to hands, feet plus all affected joints.
They found:
1. IFC improved SF-36 assessed body pain, but not other SF-36 subscales.
2. Morning stiffness, tender joint counts, and physician assessed disease activity improved.
3. In contrast, visual analogue scale assessed pain, CRP and ESR measurements were unchanged. MRI of the most affected hand or foot documented a tendency towards worsened tendinitis, soft tissue swelling, and new joint space narrowing and erosions. Bone scintigraphy showed a trend towards deterioration. New joints became inflamed within treated sites.
They concluded because of above features that; IFC has analgesic effects in psoriatic arthritis, but does not have a satisfactory disease modifying effect.

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