I use this brace. It's more comfortale than neoprene and less bulky.
http://www.kneeshop.com/proddetail.asp?prod=5421X
I bought mine at Dunham Sports.
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It's all about the X

Ok first not to be picky but there are no muscles in the knee.  The knee is a joint.  There is bone, ligaments and cartlidge but no muscles.  You may have pulled a leg muscle or sprained a ligament in the knee.  Where on the knee does it hurt?  right side, left side, front, back?  All of these are basic questions that need to be known in order to guess what you have done.  There is a lot that goes into selecting a knee brace depending on what is wrong.  Depending on what you did a knee brace may not be the answer and may be a waste of money.

That sounds like a sprain of the MCL.  I would go with one of the neoprene braces you probably dont need the stabilizer braces on the sides.  Ice and heat therapy will be your best treatment.  If it still hurts after a day or 2 or the next time you bowl dont play around and go see a Dr.  Once the knee gets damaged it is never the same again.

Ice for 20 minutes for the first "day".  I usally do this for about an hour or 2 when I get home from the center.  Then Heat for 20 minutes on 20 off over the next 2 "days".  Ice reduces swelling, heat encourages healing by increasing the blood flow.

Cho-Pat Dual Action Knee Strap.  best i have ever used.  easy to put on and with ladjustable straps, easy to adjust tension.
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