The hip is one of the most active parts of the body. It is capable of incredible range of motion while maintaining a very stable joint. One of the most common injuries to the hip is the groin pull. This occurs with overextension of the muscles around the hips. This leads to slight tearing or a complete rupture of the muscles.
Hip dislocations are very serious but rare disorders, which are almost exclusively caused by incredible forces like a car accident. An ER doctor should examine the injury immediately.