methods and devices that displace bone or other hard tissue to create a cavity in the tissue . where such methods and devices rely on a driving mechanism for providing moving of the device to form a profile that improves displacement of the tissue . these methods and devices also allow for creating a path or cavity in bone for insertion of bone cement or other filler to treat a fracture or other condition in the bone . the features relating to the methods and devices described herein can be applied in any region of bone or hard tissue where the tissue or bone is displaced to define a bore or cavity instead of being extracted from the body such as during a drilling or ablation procedure .