Could the same be applied to arthritic ankles?

Almost certainly. Ankles also rely upon hyaline cartilage (as opposed to fibrocartilage). I found this out when I had microfracture surgery for a bad ankle injury.

Looking forward to this therapy. My fibrocartilage is wearing out!

Here for the same question! Broke my left ankle three times as a football (soccer) playing youth who cared not for rehab! Now stuck with limited range of monitor and arthritis in my foot / ankle.