probably either fawkes' super sledge (the special super sledge) or the deathclaw gauntlet (workshop weapon. need daethclaw hand, leather belt, wonderglue and a medical brace).
the best brace for an overbite is the damon brace system.
In my opinion, Fallout 2.
A good place to get a good knee brace that gets you in shape is probably a fitness store. You could also find fitness shoes and all sorts of things to help you get in shape too.
There are several cool items in the game, but the fallout wiki is the best place to go for a full list of every item in the game. http://fallout.wikia.com/wiki/Fallout_Wiki
The best place to take or learn how to be a medical assistant is at a nursing school, or you can try at hospitals. The sometimes have classes were you can learn about what they do and assist them.
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I went to my orthopedist because I had a knee problem and they gave me the KNAPP Hinged Knee Orthosis Brace. It's great, and it has hinges to hold your knee in place if wobbly (it's covered with padding of course). I strongly recommend you check this out.
Fallout is a very popular role playing game. There has been several versions released. In my opinion the best to play are Fallout 3 and Fallout New Vegas, the latest version, Fallout 4 is also getting great reviews.
The best option is to get the Fallout bundle which can be purchased on Amazon.com. As a side note, the original company that made 1 and 2 filed bankruptcy and so the games can no longer be bought from their site.
FALLOUT 3
The best place to look for this information is online on official medical bulletin boards or notification websites. Alternatively you could visit your local college or medical facility for more information.