Abstract
Objectives
To explore the link between ultrasonographic features of dactylitis in psoriatic arthritis (PsA) and symptoms, digital tenderness and duration of dactylitis.
Methods
Forty-eight cases of PsA dactylitis were investigated using high frequency ultrasound (US) both in grey scale (GS) and Power Doppler (PD), evaluating the presence and the degree of flexor tenosynovitis, peri-tendinous oedema, subcutaneous PD, extensor tendon involvement, GS synovitis and intra-articular PD signal (PDS) of the involved digits. Patients were compared according to the presence of local pain and digital tenderness, the duration of dactylitis and the concomitant treatment.
Results
The presence of pain/tenderness was positively associated with US GS flexor tenosynovitis of grade > 2 (p < 0.001), PD-flexor tenosynovitis (p < 0.001), peri-tendinous oedema (p < 0.001) and subcutaneous PDS (p < 0.001); moreover, it was negatively associated with GS synovitis (p < 0.001) and intra-articular PD (p < 0.001). The same positive and negative association with US findings were found comparing patients with duration of dactylitis shorter or longer than the median (24 weeks) (p < 0.001 for all comparisons).
Conclusions
Pain and digital tenderness are linked to dactylitis duration and earlier lesions are associated with extra synovial inflammatory changes. These findings suggest a hitherto unappreciated extra synovial basis for symptoms in PsA dactylitis.
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Acknowledgments
The authors want to thank Professor Stefano Galletti for his suggestions.
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This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.
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The study was performed in accordance with the Helsinki Declaration of 1975, as amended in 2000, and the locally applicable laws. Written informed consent was taken from all subjects and the study protocol was approved by the local Ethics Committee.
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DMG received grants and/or honoraria from Pfizer, MSD, Abbvie, BMS, UCB, Novartis, Celgene and Janssen.
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Girolimetto, N., Costa, L., Mancarella, L. et al. Symptomatic psoriatic dactylitis is associated with ultrasound determined extra-synovial inflammatory features and shorter disease duration. Clin Rheumatol 38, 903–911 (2019). https://doi.org/10.1007/s10067-018-4400-z
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DOI: https://doi.org/10.1007/s10067-018-4400-z