Joint-specific prevalence and radiographic pattern of hand osteoarthritis in Korean.

We investigated the prevalence and involvement patterns of radiographic osteoarthritis (OA) with hand symptoms among Korean people and compared the difference in prevalence of hand OA between racial groups. Hand radiographs in 299 Korean subjects (266 female, 33 male) ≥40 years of age were examined, who had hand arthralgia. The study population was comprised of 206 patients who had radiographic OA at least at one hand joint. Radiographic OA (Kellgren-Lawrence scale ≥2 grades) was evaluated for 16 joints of each hand. The most prevalent OA was in the interphalangeal joints (IP) of thumb, followed by the distal interphalangeal joints (DIP) of index finger, DIP of middle and fifth finger in the frequency of order. The involvement of metacarpophalangeal joints (MP) was relatively common in 1st-3rd MP. Hand OA in Korean was higher in the thumb IP and lower in the thumb carpometacarpal joints compared with Caucasian previously reported. Moreover, the higher OA frequency of 1st-3rd MP was not in accordance with other studies in Caucasian and other Asian populations. The patterns of radiographic hand OA were symmetric (OR 15.68), clustered by ray (OR 8.69) and row (OR 6.66). In conclusion, our study showed that thumb IP and 2nd/3rd/5th DIP should be included in the assessment of radiologic hand OA in Koreans.