I'm approaching 64 and have arthritis in my left hand. I gave my beautiful Ovation 6-string acoustic/electric to an aspiring musician in our church band. After 2 years, I'm missing it terribly.
 
Do any of you guitarists know of a guitar that could accommodate my crippled hand? It's not that bad; mainly the pinkie finger. (Curse those bar chords!) I've been using Real Guitar 4, and even bought a Playstation Guitar Hero controller to get down. But they just don't come close to the Real Deal.

In the late 80s and early 90s I began to suffer weakness in my left hand and had trouble holding down chords on my electric which I was playing mostly in those days. I used different kinds of wraps on my arm e.g. a carpel tunnel brace to a small degree of help. Eventually, a wonderful doctor suggested a neck x-ray and found I had cracked my C2 and C3 a long time ago and it had healed in a way that caused a neuralgia and weakness in my arm and hand.
 
Therapy helped a lot and over time, about 10 years, the neuralgia and weakness eased up and playing was more comfortable.
 
However, during this time, the one guitar I could play well because of the neck was a US Masters Sportster made personally for me by my friend Dave Regenberg. These guitars were all over the place for a time e.g. the lead guitarist for Toby Keith and many said the same thing. Something in the neck.
 
Dave went out of business a short while back but his guitars are still found a lot here and there. Just google US Masters. I love mine and rarely use my Peavey or Les Paul.
 
For acoustic, I don't know?

Are you specifically seeking acoustic? String tension and height from the fret board come to mind right away. Not all acoustics (fixed bridge) would take to lighter strings though because they may buzz like crazy (and not sure how effective truss rod adjustment would be). A big, semi-hollow jazz guitar (built for electric strings) with an adjustable bridge may potentially strike a nice balance for you. Can put very light strings on it and adjust accordingly. Acoustically they are not "powerful" but adequate (more tension, more power), and on the electric side they can be prone to feedback issues. I have an Ibanez Artcore I bought years ago for its acoustics with the ability to "plug it in," but that one has a larger neck that I prefer and a floating bridge. I have not had issues with the bridge moving, but want to make clear that it is not fixed.
 
Electrically, bridge and truss rod adjustment would allow for much lighter tension, but may not be suitable in an acoustic environment. I actually have 10s on mine and play it acoustically fairly often only because I walk around with it at times. I can hear it fine, but would be a stretch to play it for others that way.

 
I also am experiencing pain in my hands, wrists... well, just about everywhere, and I also don't play anywhere near enough these days.  What I've done is played with different tunings so that certain chords are much easier to finger.  Greatly limits what can be played, but makes possible playing the guitar at all.
 
Aging has its drawbacks.  I have a Heritage guitar and self-built tube amp just waiting for me to retire, but now I'm realizing that I may not be able to play them once I get there.
 

Years ago, I picked up our guitarist's Gibson Les Paul. I'll never forget the gentle touch needed to play even the obtuse of chords. I am looking for an acoustic/electric, but hey, geezers can't be too picky. 

I can only commiserate as I too suffer badly with arthritis everywhere but have no suggestion for getting around the difficulty you experience playing. If I had an answer I'd help myself.

I'm reasonably content enough to record others when I now get the chance.

A fellow Pedal Steel Guitar player has arthritis in his left hand.  He was a professional lead guitar player but in the 90's developed the arthritis and had to give up his guitar playing career.  He started playing pedal steel and now has a new career as a Pedal steel guitar player. 

You know, this is a great forum. I thought it would be populated by 17-year-old wannabes whose virtuosity peaked with power chords. It's nice to know there's a "family" of musicians in all age groups with whom we can relate.
 
Now, where is my In-A-Gadda-Da-Vida lead sheet?!?!

fireberd
A fellow Pedal Steel Guitar player has arthritis in his left hand.  He was a professional lead guitar player but in the 90's developed the arthritis and had to give up his guitar playing career.  He started playing pedal steel and now has a new career as a Pedal steel guitar player. 

Now there's an idea.  I wondered if you could play something other that country (I'm clueless regarding pedal steel guitars) and came across these vids :
 
Pedal steel, rock/blues  https://www.youtube.com/watch?v=H9YCmsgE2uU
Lap steel, heavy https://www.youtube.com/watch?v=LuZrLOg6gQo
 
 

Ricebug
I'm approaching 64 and have arthritis in my left hand. I gave my beautiful Ovation 6-string acoustic/electric to an aspiring musician in our church band. After 2 years, I'm missing it terribly.
 
Do any of you guitarists know of a guitar that could accommodate my crippled hand? It's not that bad; mainly the pinkie finger. (Curse those bar chords!) I've been using Real Guitar 4, and even bought a Playstation Guitar Hero controller to get down. But they just don't come close to the Real Deal.