Evaluating Effectiveness of Powered Drill Bone Marrow Biopsy

PRIMARY OBJECTIVE: I. Assessing the quality and quantity of bone marrow core biopsies. SECONDARY OBJECTIVES: I. Assessing the nature of pain by established visual analogue scale (VAS) questionnaires. II. Timing of the actual procedure. OUTLINE: Patients are randomized to 1 of 2 arms. ARM I: Patients undergo bone marrow biopsy using the power drill. ARM II: Patients undergo bone marrow biopsy using the traditional Jamshidi needle. All patients complete questionnaires at baseline, 30 minutes after biopsy, and on days 1, 3, and 7. After completion of study treatment, patients are followed up periodically.