Disclosure: no medical training, don't play a PT on TV but I do have totally non functional joints. I'm a wreck.
Please ask your own Dr & PT but according to mine the brace is a preventative measure. I wear a brace that makes me look like a Borg when training martial arts or anything else that has a lot of lateral movement (and with me that's only MA).
If I rip, tear, shred or otherwise damage anything else ever again it's over.
My understanding is a knee is a hinge. Knees generally do the hinge thing pretty well, they looooooove to do circles.And cycling, well cycling's great for knees.
For my knees I've been continually told that ultimately wearing a brace would be worse for me. Muscles supported by a brace can become complacent and even weaker. Since there's nothing that can be done surgically to my legs my option is just sit in front of the computer and sadly read about cycling and miss it and my glory days of being outdoors or on the mator build up allllll the muscles that support my joints from the inside.
I've been ordered in no uncertain terms: stand up straight, line things up, get stronger, get flexible, fix your core or go sit down and go sedentary.
Your mileage may be different.
I had a prescription brace that I did not like, when I needed to replace it I got another one 'cause that's what my Dr. prescribed ..... it's worn out, I'll be getting this till I can get a referral for a carbon one http://www.rei.com/product/745518 but I've likely got different boo boo's than you.




And cycling, well cycling's great for knees.
or build up allllll the muscles that support my joints from the inside. 
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