I use an ACE brand one from Wal Mart. It is blue, has an open patella, and a reinforced section on each side (no metal). I think it was $12. You might chech with your physical therapist - he (she) may be able to recommend a design that may work best with your specific injury. Sorry to hear about the accident, hope you have a speedy recovery and can get back to the lanes soon!
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BAH-HUMBUG!!