Well, I am looking for an answer to this as well! I had my surgery 7 weeks ago and still have theses problems, except mine is from the knee down. I also still have pain in the knee.
The Dr. and therapist say it's from not giving proper circulation to it from not using it. If you find out a better answer it would be good to know!

Good answer....I have this too....

Caroline

HI everyone. I had surgery 5 weeks ago and spoke about both of these conditions with my surgeon. Both are normal.. The answer: massage!! yes.. go and get a 15 minute massage each day, if possible.. allow them to really massage your calf muscles, and dig into the ligaments of your ankle.. your foot is stopping an oxidation process, and capillaries are confused as they are sending messages to the brain via nerves that the joint isnt there anymore! ( that is why you dont use it).. in some respects, your brain thinks you have been amputated, and it stopping the voluntary regulation system from working there.. BUT listen to this.. if you are getting these two signs, it means you have been awesome, absolutely awesome in staying off your foot! Good job..!lastly, I bought a little foam nerf ball for 99c.. now I practice picking it up with my toes and rolling my foot on it.. stops the dead falling asleep feeling..and lastly, this past week I allowed the masseuse to really massage the knee..right on the scar wounds and touch into the ligaments and acl etc, and it felt soooooo good.. try it!
best of luck to you all