Symptom control Paracetamol Effective in oa knees Amadio curr ther res 1983 Effectiveness Ibuprofen Bradley N. Eng. J Med. 1991 Safe and economical, NSAID sparing for elder Nikles am, j. Ther 2005Symptom control Paracetamol Effective in OA knees Amadio Curr. Ther. Res. 1983 Effectiveness ~ Ibuprofen Bradley N. Eng. J. Med. 1991 Safe and economical, NSAID sparing for elderly Nikles Am. J. Ther. 2005