According to the data you provided (severe pain, no popping, no clicking, no locking, no range of motion, no instability, minor swelling), you might be experiencing inflammation of the bursae of the knee-joint. The bursae of the knee-joint are synovial sacs filled with the same synovial fluid as the joint.
They communicate with the joint space, thus increasing the volume that can be filled with the synovial fluid. This can happen when certain of the knee-joint structures are damaged, usually due to mechanical force. The damage to the tissue would cause inflammation and increased production of the synovial fluid, which in the end results in swelling of the joint.
According to the information you provided, it cannot be determined which joint structure was damaged and to what degree. Therefore, you might want to visit an orthopedist for a physical examination and x-ray or other visualization methods. Meanwhile, rest is recommended.
Anti-inflammatory products might also reduce the swelling and ease the pain. However, it does not necessarily mean that the tissue has healed completely. It would have to be confirmed by an orthopedist through examination.
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