Hi Dave

Glad to see you're improving and to keep reading your input.
I realise you can't exercise at present but you probably remember my mentioning previously about Tai Chi being of benefit to wheelchair bound people. Thought I'd find a couple of links you could peruse while you're resting to maybe see if it's something that might suit you in the future. I've put comments in regarding how I think these compare to traditional Tai Chi.

http://www.disabledsportsusa.org/tai-chi/
This is a basic adaptive style - it has a good explanation and the focus on breathing is included. You may find some of the arm positions awkward with your injuries but they could be further simplified to suit.

https://www.youtube.com/watch?v=TmaHCKynnEg
This is a video of seated Tai Chi - the tutor's instruction style is easy to follow. This may be suitable for what I previously mentioned about just imagining doing the movements in your mind (without actually the physical actions). It'd be suitable to start with and then with practice you could do the same with more advanced forms. There are other videos on youtube.

Congratulations on the awesome weight loss - your determination to stick at this, in spite of setbacks, is an inspiration to those of us still struggling.

Bluesfan

P.S. Another day, a new toss of the coin, and it's a completely different game - and who said test cricket was boring?