I was returning after offering asar prayer and saw a man sitting outside. I asked the reason and he responded that he had severe knee pain. I asked him to recite surat-al-Alaq after fajar prayer and then blow on knee joint. (If Allah will) you will be healed. Or else if you have pain elsewhere in joints after every prayer place you hand on effected area and recite یَاغَفُوْرُ، یَاغَفَّارُ  Yaa Ghafooru, Ya Ghafaaru 11 times each. That man met me after 15 days and said that he has recovered 70%. (Anonymous)