Part of the preoperative process is also ensuring that you're an appropriate candidate for the joint replacement. We have a number of preoperative optimization steps that we need to go through prior to scheduling and performing your joint replacement. This includes making sure you're no longer a smoker. And if you are, you need to stop smoking at least a few weeks before your surgery. Another is weight. There are several cutoff factors and multiple orthopedic surgeons used throughout the country. Typically we use a standardized weight of body mass index in order to evaluate what your weight is prior to your surgery. There are several orthopedic surgeons around the country. We use a cutoff value of 40 for your BMI. If you have diabetes, typically we use hemoglobin A1C as the cutoff as well.