The present invention relates to a strontium salt (I)whereinn is an integer which can take the values of 0 or 1m is an integer which can take the values of 0 or 1R is hydrogen, methyl or ethyland stereoisomers or hydrates thereof, to methods for its synthesis, and use in the treatment and/or prophylaxis of a cartilage and/or bone disease and/or conditions resulting in a dysregulation of cartilage and/or bone metabolism in a mammal.