It's well known problem, osteoarthritis knee,start with physiotherapy for 10 to 15 days asap
Next Steps
try to avoid stair climbing , sitting on the floor, stair climbing for couple of days, try to reduce the weight, go for
calcium rich diet
Health Tips
take suppliments to build glucosamine level in blood, multivitamin suppliments for 2 to 3 months, check your
vitamin d level in blood