Experimental radiation synovectomy by 165Dy ferric hydroxide macroaggregate.

The short half-life beta emitter 165Dy coprecipitated as a macroaggregate with ferric hydroxide (FHMA) has been shown to destroy knee synovium in the antigen-induced arthritic rabbit. Using 153Gd as a gamma tracer for leakage studies revealed that the leakage of this system from rabbit knee joints never exceeded 1.2% over 24 hours. This is such less than the leakage rates reported from any human studies or our rabbit studies using 198Au.