A method for preparing a treatment composition for treatment of osteoarthritis including un-cultured stromal vascular fraction cells from adipose tissue includes direct aspiration of material of a centrifugally-formed pellet phase including stromal vascular fraction cells from enzymatically-digested adipose tissue from an internal containment volume of a portable apparatus through an aspiration tube inserted into the pellet phase and into a fluid receptacle located outside of the internal containment volume. The treatment composition may be administered into or in the vicinity of a patient's joint to be treated for osteoarthritis.
