Table 2.

Eligibility criteria.

Inclusion criteria:
•participants were over 18 years old
•participants (cases) with osteoarthritis, defined by either radiographically confirmed osteoarthritis, patient reported osteoarthritis, or clinical diagnosis
•they used grey scale ultrasound imaging or power Doppler to assess one or more ultrasound imaging features in peripheral joints of the hand and feet
Exclusion criteria:
•were unpublished; non-peer-reviewed; do not involve humans; are in vitro studies; opinion articles; letters to the editor; non-English articles and abstracts
•included participants with inflammatory arthritis or a neurological, endocrine or metabolic disorder.
•only evaluated ultrasound imaging features evaluated in other joints, aside from those of the hands and feet
•studies that utilised ultrasonography only for guiding injections and did not report any USI feature data or findings of the ultrasonography examination