Thanks for additional information.
As per your description, I would be most concerned about a meniscal tear.
This type of injury can cause swelling in the joint (effusion) as well as an inability to move the joint in a complete range of motion.
The best type of imaging to evaluate this type of injury is an MRI of the knee. This can also give some useful information about the stablizing ligaments in the knee (like the ACL) as they are associated with meniscal injuries.
I would recommend consulting your primary care doctor or an orthopedic surgeon.
Physical therapy can be effective in your case.
Motrin/Advil can be taken for pain relief.
Elevate your leg.
Even a color doppler study of lower limb can be advised if bruising is spreading continuously.
It's good to make an appointment with an Orthopedist rather than wait & watch approach.
Hope this helps.
Positive feedback and bonus are highly appreciated.
Feel free for further query or follow-up.