Update, so now I am at about 4.3 cm. The latest X-rays are out, and they show that my bone healing is kinda too fast. I was asked by my local ortho to do at least 0.75/0.5 on alternate days, which is an average rate of 0.625 mm/day.
For a few days (about 1-2 weeks ago), I actually did 0.5 mm a day for a few days because I was having severe archilles strain and hamstring tightness.. After that, I started doing alternate 0.5/0.75. Even now, after doing 0.5/0.75 for almost a week or so, I do not have any archilles tightness or hamstring tightness.
Dorsiflexion is still 20 degrees, and knee contracture is still absent, but I think sometimes my right leg gives problems. and I have to straighten it and stretch it. Walking does wonders to straighten up your knees. My left knee is always straight even without stretching.
I am allowed to sleep with knees flexed but I find that if I keep one leg totally straight and sleep on my side, then in the morning, it is not so bad.
I am able to take food (ie, stand momentarily without holding the walker) , I am still able to walk without any loss of mobility, I am still able to walk properly with walkers, and I am still working a few days in a week (for a few hours, teaching).
I stand and walk for a total of about 30 minutes a day, I occasionally stretch my knees and my archilles tendon.
Sleep is perfect. I am on Lyrica, so I guess it kinda helps as an indication of Lyrica is anxiety disorder and so I guess its sleep inducing. Tramadol is also ... makes you so lazy and sleep inducing. Hence, I did not do much PT, its all because of Lyrica and Tramadol but I am trying to fight the laziness. For the past few weeks or maybe two months I did not use any sleep aids, or anti-histamines, or sedatives. Sleep is just perfect. I guess it is probably since I am doing all this in the comfort of my own home, so I can sleep well.
Pain? Pain is almost zero. Zero when tramadol and paracetamol is in full effect. Some slight discomfort when walking even though tramadol and paracetmaol is 8 hours past the last-dose.
If I can reach 5-6 cm, and stil have no problems with sleep, pain and mobility , I will do 8 cm.
I have many many cards up my sleeve: anti-histamines for sleep. possible increase of dosage of tramadol from 150 mg to 300 mg, Xanax and benzos for sleep, Trazodone for sleep, Phenazepam injection to relax muscles and sleep, many codeine pills, eperisone for muscle pain and spasms, etc . All these cards can be played when I approach 8 cm, because I have not even used them at all. I think I can do this
Somehow, dr fahri is right, around 4 cm the pain is zero, and it might get worse as I approach 8 cm. At 4.3 cm, WBG was also doing very well. Crimsontide got problems at 5 cm. Another guy (who strongly protests against and refuses to disclose his identity, for god knows what reason) also has severe ballerina problems at 5 cm. So I might be, I might be doing well enough, to do 8 cm.
Time will tell.