It is what you do while sitting that influences your leg while playing badminton. For your height of you are in the habit of sitting crossed with that leg, then the muscles of that leg are relatively weaker and stiff. When you play on this leg it gives pain. This is patellofemoral joint pain at knee.
Next Steps
improve sitting habits, stretching plus strengthening of muscles, taping for patella.
Health Tips
we can do a teleconsultation if you want.