This will be a 13-week A randomized open labelled clinical trail in Iraqi Kurdistan Region, that will be designed to assess the efficacy of duloxetine tablet compared with other group (Nonsteroidal anti-inflammatory) drug on the reduction of pain caused by osteoarthritis of the knee.~Patients will be divided into two groups, first group (case) will receive duloxetine tablet 30mg for two weeks then titrated up to duloxetine 30mg BID. Patients will be instructed to take the medication with meals. Patients will be observed at visits (0) baseline then at second visits at 13 weeks then will be compared to control group that will receive NSAID (nonsteroidal anti-inflammatory drug) at baseline (0) visit then 2nd visits at 13 weeks.
Osteoarthritis (OA) is the most common degenerative joint disease, affecting more than 25% of the population . Knee OA is an insidious disease related to structural changes in the joint over many years. Progressive articular damage results in a loss of the extracellular matrix of cartilage in addition to changes in subchondral bone.~Duloxetine, a selective serotonin, and norepinephrine reuptake inhibitor, it seems to be effective in treating neuropathic and chronic pain conditions.