Abstract: A bone marrow biopsy needle assembly for obtaining a bone marrow core biopsy and a bone marrow aspirate biopsy in a single procedure includes an outer aspiration sheath which closely surrounds a coaxial inner hollow coring needle, and a trocar which extends through the coring needle. A handle arrangement is provided to allow insertion into the bone of the central trocar, the core biopsy needle and the outer aspiration sheath as an assembly, and to further allow stable manipulation of each component of the system without displacing the outer aspiration sheath. After insertion of the combined system through the cortical bone layer, the trocar is withdrawn. Further pushing and, if desired, twisting of the remaining assembly forces a bone marrow core biopsy into the inner, coring needle. The coring needle is then withdrawn and the bone marrow core biopsy is pushed out in a retrograde manner.