Answer:
These two papers compare the results of syringe and pump aspiration methods in liposuction. The 1991 paper studied 6 patients who underwent fat aspiration with a syringe on one side and with a pump on the other. They noted considerably less blood in the fat aspirate from the syringe, and less bruising and morbidity in the post-operative period. The 1993 paper confirmed the reduced blood loss with the syringe method, in a study which examined patients undergoing 1200-1500 ml of liposuction. In addition, syringe-treated patients appeared to heal faster, return to work in a shorter period of time, and had less pain.