Whether you're walking, running, lunging, squatting, or performing any other type of lower body movement, tibia rotation is important to maintaining lower extremity health.
I'd argue that it's also the most overlooked movement when it comes to assessment processes.
Lack of tibia rotation leads to compensatory movement at either the joint above and/or below. Load these positions repetitively over a long period of time and you're bound to injure yourself. Regardless of the joint you're addressing, it should work efficiently independently before you implement it into a global system.
Here's a great way to easily assess your active tibia range of motion and incorporate the appropriate drill to improve restricted ranges if present: