I "cracked" My Knee By Bending It (like Cracking A

I "cracked" my knee by bending it (like cracking a knuckle) 2 months ago, and by the end of the day, I could hardly walk on it. For the next few weeks it was very painful, swollen, and had little movement. Now, it feels as though there is an inflammed band around me knee, especially around the outer edge. It is still painful, and with limited movement.