What Causes Swelling In The Hips After An Injury?

I had a bike accident and landed on my right hand, elbow and hip, I got up immediately and continued riding then spent the rest of the day moving furniture. My hip is swollen the diameter of a tennis ball when leg is fully extended. I can walk on it and raise and lower it , but the day after I am feeling some pain. I feel the most pain, though not unbearable if I cross my right foot over my left while laying flat on my back on the bed. I can walk on it, but feel slight pain at the point of iimpact. Could I hang from an inversion table with any beneifit. Both leg still appear the same length.