Disclosed herein are heretofore undescribed preparations of highly concentrated, solubilized proteins, such as but not limited to, Bone Morphogenetic Proteins. Such protein preparations can be formulated in an aqueous carrier at protein concentrations in excess of 10 mg/ml when using the methods of manufacture taught herein. Such methods yield stable protein preparations in either solubilized or lyophilized form. The protein preparations of the present invention are particularly beneficial when administered either locally or systemically, in part, because low administration volumes can be accomplished. This is especially important for local treatment of certain anatomic locations such as, for example, the synovial fluid of a joint when treating osteoarthritis with BMP-7 or the intradiscal space when treating degenerative disc disease with BMP-7.
