The effect of the N compound in the treatment of knee pain

INTERVENTION: Intervention 1: Intervention group: N oil compound; The compound is made of olive oil, turmeric, coriander oil, and egg yolk by a traditional medicine pharmacist in Mashhad's Bouali laboratory, which is applied to the knee for 3 to 5 minutes daily. Intervention 2: Control group: The placebo (paraffin oil with a bright yellow pigment, similar to substance N) is synthesized by a traditional medicine pharmacist in the laboratory of Bouali Mashhad, who applies this drug to the knee for 3 to 5 minutes daily. CONDITION: M06.9 Rheumatoid Arthritis. ; Rheumatoid arthritis, unspecified PRIMARY OUTCOME: Knee pain. Timepoint: before intervention and after intervention. Method of measurement: Visual Analogue Scale (VAS) and WOMAC (Western Ontario and Mc Master) questionnaire. The joints morning stiffness. Timepoint: before intervention and after intervention. Method of measurement: Visual Analogue Scale (VAS) and WOMAC (Western Ontario and Mc Master) questionnaire. The Knee function. Timepoint: before intervention and after intervention. Method of measurement: Visual Analogue Scale (VAS) and WOMAC (Western Ontario and Mc Master) questionnaire. The Knee range of motion. Timepoint: before intervention and after intervention. Method of measurement: Visual Analogue Scale (VAS) and WOMAC (Western Ontario and Mc Master) questionnaire. INCLUSION CRITERIA: 45‐70 years old Confirmation of the disease by a rheumatologist according to the criteria of the American College of Rheumatology