Robotic surgery enables surgeons to perform complex surgical procedures with more precision, flexibility and control. The ‘robot’ usually includes a camera arm and several mechanical arms with surgical instruments attached to them, whilst the surgeon controls the arms from a computer near the operating table. Benefits of minimally robotic surgery can include fewer complications; less pain and blood loss and shorter hospital stays. We are undertaking research to assess whether robotic-assisted knee and hip replacements provide better results than standard knee replacement and if robots provide good value for the NHS.