Use of the hypospray jet injector for intra-articular injection.

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Abstract
Hypospray jet injector for local injection of steroids based on 753 injections given to 228 patients with various rheumatic conditions is reported. Four hundred eighty six injections were given to 152 patients with rheumatoid arthritis; both large and small joints showed satisfactory improvement, but the greatest benefit was achieved in the small joints of the hands and feet, in which 86% of injections produced moderate to marked improvement, and the median duration of improvement ranged from 5.6 to 9.3 months. Complications were minimal, with only 1 joint infection in the series, an incidence of 0.013%. Satisfactory results were also obtained in the treatment of other arthritides and of non-articular rheumatism. Compared to the needle, the hypospray is more rapid to use, produces less discomfort, and is more acceptable to patients, especially to children.