I'll limit myself to the bass issue rather than the medical issue, as I have neither experience nor qualifications regarding the latter.
I have recently added a Pawn Shop Mustang to my small collection, and as far as I am concerned it is just as valid as my long scale basses. The 34" scale length came from an arbitrary decision by Leo Fender as to what would work on a a solid fretted bass guitar. It is not written in stone. Fair enough it does work, but so does 30".
A short scale bass may be 'easier' to play in the sense that less left-hand stretching is required, and the tension is less for a given string gauge, but it also presents a much smaller area for the left hand to work on, and therefore can feel a bit cramped.
I bought the Mustang because it plays well and sounds great, in an old school Precision sort of way. And it looks as cools as an eskimo's fridge. It is another option, a different flavour. If you like it, go for it.