Dear friend, welcome and thanks for entrusting your query here at HCM!
I am Dr. Prasad Akole (Critical Care Expert- http://bit.ly/Dr-Prasad-Akole) and am glad to address to your
If there is sudden pain, clicking in the knee and inability to bear weight and walk, it may be a ligament tear/ meniscal tear in the knee joint. These are the rope-like structures holding the joint surfaces together.
Less likely it is a sprain
You should better see your orthopedic expert and get evaluated if there is a tear. Till then you can get simple pain killers like acetaminophen
or use local pain relief sprays on the knee.
Avoid putting any weight on the affected knee.
I hope you are fully satisfied with the guidance I gave.
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Thank you and Good luck!