Volumetric quantitative measurement of hip effusions by manual versus automated artificial intelligence techniques: An OMERACT preliminary validation study

Semin Arthritis Rheum. 2021 Jun;51(3):623-626. doi: 10.1016/j.semarthrit.2021.03.009. Epub 2021 Mar 17.


Objective: Preliminary assessment, via OMERACT filter, of manual and automated MRI hip effusion Volumetric Quantitative Measurement (VQM).

Methods: For 358 hips (93 osteoarthritis subjects, bilateral, 2 time points), 2 radiologists performed manual VQM using custom Matlab software. A Mask R-CNN artificial-intelligence (AI) tool was trained to automatically compute joint fluid volumes.

Results: Manual VQM had excellent inter-observer reliability (ICC 0.96). AI predicted hip fluid volumes with ICC 0.86 (status), 0.58 (change) vs. 2 human readers.

Conclusion: Hip joint fluid volumes are reliably assessed by VQM. It is feasible to automate this approach using AI, with promising initial reliability.

Keywords: Artificial intelligence; Effusion; Hip joint; MRI; OMERACT; Osteoarthritis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Artificial Intelligence*
  • Hip Joint* / diagnostic imaging
  • Humans
  • Magnetic Resonance Imaging
  • Reproducibility of Results
  • Synovial Fluid