Thanks for writing in,
If the injury
occurred today ,I would say apply an ice pack immediately and intermittently on the affected knee. Take a tablet of brufen
200mg three times a day after food for 2 days. While you are lying down, keep your left knee elevated on a couple of pillows. Get good rest. Do not put pressure on the left knee while walking. Use crutches for a couple of days if required.
Most likely it might be a ligament/meniscus
injury. However, you might also want to rule out the possibility of a fracture
. In case there is no symptomatic improvement whatsoever after 2 days, I would advise you to visit the orthopaedician and get an X-Ray of the left knee.
Hope this helps.
Dr. Divya Kuttikrishnan