AI Article Synopsis
- The study aimed to assess the frequency and reliability of inflammation in extensor tendons and synovitis in the metacarpophalangeal joints of patients with psoriatic arthritis using ultrasound.
- A total of 27 patients were examined, revealing that ultrasound detected inflammation in more joints than clinical assessments did, with a notable overlap between observed swelling and ultrasound findings.
- The results indicate that both types of inflammation contribute to joint swelling, with extensor tendon inflammation being as common as synovitis, and the reliability of ultrasound findings for tendon inflammation is comparable to that for synovitis.
Article Abstract
Objectives: To evaluate by ultrasound (US) the frequency and reliability of peritenon extensor tendon inflammation (PTI) and intra articular synovitis (IAS) in metacarpophalangeal joints (MCPj) of psoriatic arthritis (PsA) patients.
Methods: 27 PsA patients with clinical involvement of MCPj were consecutively included. Presence of PTI and IAS were evaluated by grey-scale (GS) and power Doppler (PD). Longitudinal and transverse 3-5 second videos of US examinations were recorded for reliability assessments by five readers. Consensus on positive US results was achieved when at least three readers agreed.
Results: Clinical swelling was present in 60 joints whereas US detected IAS and/or PTI in 75 MCPj. GS PTI in at least one MCPj was found in 19 patients and 41 joints, concurring with clinical swelling in 30/41. GS IAS in at least one MCPj was found in 23 patients and 63 joints, concurring with clinical swelling in 37/63. The inter-reader reliability was good for PD PTI and moderate for GS PTI.
Conclusions: Our study identifies that both IAS and PTI cause MCPj swelling, where PTI is almost as frequent as IAS as a cause of swelling. The reliability of PTI is at least as good as for IAS.
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