RT Journal Article SR Electronic T1 Femoral head osteonecrosis in primary hypertrophic osteoarthropathy. JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 386 DO 10.1136/ard.52.5.386 VO 52 IS 5 A1 I Jajic YR 1993 UL http://ard.bmj.com/content/52/5/386.abstract AB