"Nano" surface implants — such as some products marketed with ultra-fine, friction-reducing surfaces — are engineered at a very small scale and are generally classified as smooth under current surface standards.
The concept
Manufacturers describe these surfaces as reducing friction and tissue trauma while avoiding the larger surface area of textured shells. Some are produced as a single, seamless construction intended to improve shell integrity.
How to weigh the claims
Marketing language around novel surfaces can outpace independent long-term data. Treat manufacturer claims as a starting point and ask your surgeon what published evidence supports them, how the surface is classified, and how it fits your overall plan.