How old are you and what general physical condition are you in? Some martial arts are "gentler" and some are more prone to get you injured.
Skowinski-wife and I go to a school that is focussed on Brazilian Jiu Jitsu, but also has Judo and MMA training. You might think about finding a place that offers more than one martial art, if that exists where you are.
"The atoms or elementary particles themselves are not real; they form a world of potentialities or possibilities rather than one of things or facts."
- Werner Heisenburg
In memory of Nika: http://advrider.com/forums/showthread.php?t=990697