Sonographic assessment of Achilles tendon in patients with cutaneous psoriasis.

Background: Psoriasis is a common, chronic, immune-‌‌‌‌‌‌mediated inflammatory disease with a variety of skin manifestations. The aim of this study was to determine the prevalence of subclinical Achilles tendon disorder in cutaneous psoriasis patients and compare it with healthy controls.

Methods: This was a cross-sectional case-control study conducted on psoriasis patients that were referred to dermatology clinic. Thirty patients in the case group and 30 healthy controls were included in the study. Thickness of Achilles tendon enthesis was scanned by an expert rheumatologist using ultrasound equipped with a 5-14 MHz linear prob bilaterally.

Results: The mean age of the patient and control groups was 43.97±16.82 years and 38.87±12.71 years, respectively (P=0.190). The mean thickness of the Achilles tendon enthesis in the dominant limb was 4.31±0.86 mm in the patient group and 4.10±0.54 mm in the control group. There was no significant difference between the two groups in terms of thickness of the Achilles tendon enthesis in the dominant limb (P=0.276). The mean thickness of the Achilles tendon enthesis in the non-dominant limb was 4.44±0.91 mm in the patient group and 4.14±0.59 mm in the control group. There was no significant difference between the two groups in terms of thickness of Achilles tendon enthesis in the non-dominant limb (P = 0.134).

Conclusion: Although ultrasonography may be utilized for assessment of both structural and inflammatory changes, we revealed no difference in the mean thickness of Achilles tendon enthesis in patients with cutaneous psoriasis. Contradiction between clinical and ultrasonography features required further research.