Implications of ultrasound enthesitis in early spondyloarthritis
French rheumatologists reported on the implications of an ultrasound peripheral enthesis assessment in 402 patients with early axial spondyloarthritis in the French DESIR cohort. The ultrasound evaluation covered the lateral epicondyles, Achilles tendon, and superior and inferior patellar ligament entheses. The results were summed up in ultrasound structural and power Doppler scores. In addition, the investigators obtained spine and sacroiliac joint MRI scans and spine x-rays, all scored centrally.
It turned out that ultrasound abnormalities weren’t useful in monitoring axial spondyloarthritis clinical disease activity as reflected in Bath Ankylosing Spondylitis Disease Activity Index scores, nor were the ultrasound structural and power Doppler scores associated with MRI spine inflammatory lesions or sacroiliitis. However, ultrasound enthesophytes were strongly associated with axial syndesmophytes, suggesting that these ultrasound abnormalities might be a marker of disease severity in axial spondyloarthritis (RMD Open. 2017 Sep 7;3[2]:e000482).
“Whether or not by inhibiting these peripheral enthesophytes you’ll ultimately inhibit further enthesophytes or syndesmophytes from forming is yet to be seen,” Dr. Wells cautioned.
He added, however, that a recent short-term, randomized, placebo-controlled trial in 185 patients with nonradiographic axial spondyloarthritis holds hope in that regard. Investigators in the ongoing multicenter EMBARK (Effect of Etanercept on Symptoms and Objective Inflammation in Nonradiographic Spondyloarthritis) trial reported that treatment with etanercept was associated with a significantly greater reduction in erosions, an increase in backfill, and improved clinical outcomes, compared with placebo, as assessed by MRIs obtained at baseline and 12 weeks.
The investigators viewed these findings as consistent with an early reparative response to the anti–tumor necrosis factor agent, although they noted that understanding of the biologic agent’s true impact on disease progression awaits longer-term follow-up in the 104-week study (Ann Rheum Dis. 2018 Jan;77[1]:78-84).
Dr. Wells reported serving as a consultant to more than half a dozen pharmaceutical companies and receiving research funding from Abbott, Celgene, and UCB.