The cost of new ideas and ways of doing things based on improved technology probably does raise the cost at first. In theory, the idea is to gain a higher degree of control when doing surgery.
The surgeon will make fewer errors. The patient will get better joint alignment and function. There will be fewer failed implants. The patient will be more satisfied. Second (and third) operations after the first won't be needed.
The operation can be done in less time. The surgeon won't need another surgeon to assist in the operation. Rehab can begin sooner. All of these various factors have the potential to save money in the long run. We won't know for sure until results are ready from studies done over five years, 10 years, and longer.
Like most advances in medicine, the cost goes down the longer it's been in use.