Hook erosions refer to smooth, non-destructive erosions occurring on the radial palmar aspect of the metacarpal heads and associated with Jaccoud arthropathy. Hook erosions can help differentiate Jaccoud arthropathy from rheumatoid arthritis.
Hook erosions must be differentiated from the similarly named hook-like osteophytes seen in haemochromatosis. Hook-like osteophytes are not associated with Jaccoud arthropathy.
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