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Does joint position affect US findings in inflammatory arthritis?

Ahmed S Zayat1, Jane E Freeston, Philip G Conaghan

  • 1Section of Musculoskeletal Disease, Leeds Institute of Molecular Medicine (LIMM), University of Leeds and NIHR Leeds Musculoskeletal Biomedical Research Unit, Second Floor, Chapel Allerton Hospital, Leeds LS7 4SA, UK. aszayat@doctors.net.uk

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Joint position significantly impacts ultrasound assessment of synovitis in inflammatory arthritis. Standardizing hand joints flat and knees at 30° flexion maximizes grey scale and power Doppler scores for reliable imaging.

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Area of Science:

  • Rheumatology
  • Medical Imaging
  • Orthopedics

Background:

  • Musculoskeletal ultrasound (US) is crucial for assessing synovitis in inflammatory arthritis (IA).
  • Variability in joint positioning during US acquisition can affect reliability and reproducibility.
  • Standardized imaging protocols are needed for consistent US assessment of synovitis.

Purpose of the Study:

  • To investigate if changes in joint position significantly alter the quantification of US-detected synovitis in IA patients.
  • To determine optimal joint positions for maximizing US detection of synovitis.

Main Methods:

  • Recruited IA patients with swollen wrists, MCP, and/or knee joints.
  • Quantitatively assessed synovitis using grey scale (GS) and power Doppler (PD) in various joint positions.
  • Evaluated inter- and intra-reader reliability.

Main Results:

  • Highest GS and PD scores for MCP and wrist joints were observed in the flat (0°) position (P < 0.001).
  • Knee joints showed greatest GS and PD scores in 30° flexion (P < 0.001).
  • Inter- and intra-reader reliability for synovitis assessment was good to excellent.

Conclusions:

  • Joint position critically influences US assessment of synovitis.
  • Standardized scanning of hand joints in a flat position and knees in 30° flexion yields highest GS and PD scores.
  • These findings support optimizing joint positioning for reproducible US evaluations in IA.