Self-curing polymethylmethacrylate (PMMA) or acrylic bone cement is used extensively in total joint arthroplasty and in the repair of bone defects –. However, the hand mixing of the methylmethacrylate polymer and the liquid monomer entraps air bubbles making the cement porous. This adversely affects the mechanical properties of the bone cement . This has prompted several investigators to improve the mechanical properties of bone cement by reducing the porosity due to air bubbles by the use of centrifugation or by vacuum mixing –. In this study we investigated if ultrasonic vibration during cement mixing could reduce the porosity and improve the mechanical properties of surgical grade polymethylmethacrylate.