Early detection of subclinical lower limb enthesopathy by ultrasonography in patients with psoriasis: Relation to disease severity

Abstract

BackgroundEntheseal involvement is a frequent and distinctive feature of psoriatic arthritis (PsA). It is detected clinically but lacks sensitivity and reliability. Musculoskeletal ultrasound (MSUS) is an important tool for accurate detection of enthesitis. Aim of the workTo determine the frequency and distribution of subclinical entheseal abnormalities at lower limbs using MSUS in patients with psoriasis for early detection of PsA, and to evaluate its relation to disease severity. Patients and methods80 patients with psoriasis were studied. Psoriasis Area and Severity Index (PASI) was assessed. High-resolution MSUS assessment of quadriceps, patellar and Achilles tendons, and plantar fascia entheses was performed. Glasgow Ultrasound Enthesitis Scoring System (GUESS) was assessed. ResultsThe median (interquartile range; difference between 75th and 25th quartile) age of the patients was 46(26.3) years and were 42 males. The disease duration was 9(12) years, PASI was 10.9(18.9), and GUESS 6(4). Nail dystrophy was found in 48(60%). Clinical enthesitis was found in 15(18.8%) patients; MSUS revealed lower limb enthesopathy in at least one enthesis in 76(95%) patients, and abnormality in 421 of 800 entheses (52.6%). Distal insertion of the patellar tendon was the most frequently involved (68.8%). GUESS significantly correlated with the age, body mass index (BMI), and PASI. ConclusionPsoriasis is associated with a relevant frequency of asymptomatic entheseal abnormalities. MSUS is a valuable, simple, and noninvasive tool in early detection of enthesopathy in psoriatic patients, especially in the presence of older age, high BMI, and high PASI as potential parameters for detection of psoriatic enthesitis.