Running on treadmill is potentially harmful for joints especially if the joint is already showing signs of degenerative changes and also not rightfully building your knee muscles.
Stop treadmill completely. Try doing simple strength exercises with machine / weights 3 times/ week.for atleast 6 weeks. Keep the intensity medium.
Do only brisk walking after that for 3-4 days 30 minutes.
Next Steps
overdoing on treadmill can damage your joint permanently and lead to complications.
Health Tips
wear well fitted walking shoes while walking and in daily life.
Avoid pointed shoes.