Recent introduction of techniques in total knee replacement is an additional tool to help surgeon. It's never ever a replacement of a surgeon's hand or his expertise.
Tools like navigation , Patient specific & Robotic arm is helping a surgeon to produce precise results more specifically in extra articular deformities of the leg.
All these tools have their limitations of knee balancing which is the main key of successful soft tissue alignment in TKR surgery.
A surgeon's hand is the only tool for surgery results apart from these techniques which are just helping hand not the surgeon's alternative.