Table 1 Inclusion and exclusion criteria

Fulfilling ACR critera

Thumb-base OA

Age between 45 and 65

Erosive OA

Interphalangeal OA

Rheumatoid arthritis, psoriatic arthritis

Gout, pseudogout, haemochromatosis

Tenosynovitis, epicondyliitis

Trigger finger, Dupuytren’s contracture

Carpal tunnel syndrome, polyneuropathy

Diabetic cheiroarthropathy

Fibromyalgia

Hand injury or hand surgery within 6 months

Intraarticular injection of any kind to any hand joint within 3 months

Inflammatory changes in US examination