She may be suffering from osteoarthritis where there is inflammation of joint takes place and patient is having Pain...it may be osteoporosis where generally calcium deficiency is present... bending of knee is difficult....
Next Steps
get an x Ray with patient standing
Health Tips
if joint space is normal then can be cured with physiotherapy and exercise specially of VMO..
which is main muscle to taken care of....
The spot shown in the image feels sharp pain while pressing on the spot( edge of the knee )( for the past
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