i had an arthroscopy 5 years ago and never really recovered so that i dont have any pain, but been running and playing sport etc. Doctor gave me a euflexxa injection on thursday and felt fine after. about 17 hours later i woke up with excruciating pain and stiffeness. It is now 3 days later and i havent really recovered from this and getting a bit worried. if i rest my knee for too long it totally tightens up, but if i do excercises like walking up and down the stairs it feels ok during rest. should i be concerned at this stage, my OS didnt seem to indicate that i would be going through this