One would assume so, but you should be able to run with calf armour. The only purpose that could serve (physically speaking) would be to allow for gastrocnemeous contraction. Not that they swelled particularly much.
The point is, having him pop off overlapping joint armour would have made perfect sense for Mikasa's previous actions and his super-tackles.
The story itself flowed fine. All that needed to happen was to make sure Armoured Titan was drawn in such a way that explains his prior invulnerability and current weakness.
@Krayz33: Good pickup. Those 3 titans have no skin or fat. Talking about that.. Colossal Titan looked like he was just left with a skull in those final shots of the episode.
If it's not Isuzu-chan Mii~