there were no significantly deviating hla frequencies in the following diagnostic groups : clinical sacroiliitis ( 20 patients ) , polyarthritis with clinically silent sacroiliitis ( 12 patients ) , polyarthritis without sacroiliitis ( 47 patients ) , arthralgia preceded by beta-streptococcal infection ( 17 patients ) , other arthralgia ( 33 patients ) , osteo-arthritis ( 13 patients ) and other arthritis ( 12 patients ) .
C0162323
polyarthritis
C0003864
arthritis