28 yo male Ski accident Feb 20. Mri reports acl complete midsubstance tear, and possible lateral meniscus tear. Will have acl reconstructive surgery in 2 months. In the meantime, extention of the knee is limited with about 5-6 degrees off from full extension and minor pain when walking downstairs. No signs of knee giving buckling. My question is when i try to extend the knee i feel a small lump forming on the later side of the knee. There is no swelling currently. Could this lump be the torn lateral meniscus that im feeling or could it be the acl stump? Thank you.
Hi and welcome to Chat Doctor. Thank you for your query. I am Chat Doctor and I will try to help you as much as I can.  This is possible Bakers cyst or some other dilatation of tedious sheath or ligaments. It is not likely to be associated with meniscus. I suggest doing ultrasound and needle biopsy if necessary and then treatment can be planned.  I hope I have answered you query. If you have any further questions you can contact us. Kindly regards. Wish you a good health.