[Mezlocillin concentrations in human bone tissue].

20 patients undergoing extended hip surgery received a single i.v. injection of 2 g 6-[(R)-2-[3-methylsulfonyl-2-oxo-imidazolidine-1-carboxamido]-2-phenyl-acetamido]-penicillanic acid sodium salt (mezlocillin, Baypen). At different times after the infections but simultaneously 31 samples of blood and bone (spongiosa) were collected for determination of mezlocillin concentrations. On an average, maximum concentrations of approximately 20 microgram/g bone were demonstrated 30 min after injection, these being within the clinico-therapeutical range. The concentration of azlocillin--another acylureido-penicillin--was comparatively higher.