Hip instability is a relatively new diagnosis and concept.  It was previously though that the shoulder was the only inherently unstable joint, prone to dislocations and the chronic feeling that the shoulder has “come out of socket”.  Because the hip has much more bony coverage than the shoulder, the hip was always thought to be stable.  Yet in recent years with better diagnostics, enhanced imaging, and a greater understanding of hip anatomy, hip instability has become better defined.  Instability is a result of slightly abnormal bony or soft tissue structures that can leave the hip prone to micromotion of the ball within the socket.  It is very rare for the hip to come completely out of socket, but these micromotions may lead to feelings of the hip coming out, recurrent popping.snapping, being unstable, or pain resulting from a torn labrum.  From a bony standpoint, the socket can be completely or just partially shallow, but not shallow enough to be dysplastic.  From a soft-tissue perspective, generalized hypermobility (excessive flexibility), capsule (ligaments covering the hip joint) looseness, capsule insufficiency, labrum tears or labrum insufficiency and tears of the ligament connecting the ball to the socket (ligamentum teres), can all contribute to hip instability.  Additionally, the rotation and position of the socket and thigh bone (femur) can also cause instability to a certain degree.  A proper thorough assessment is required to properly diagnose hip instability.  Treatment typically involves rest, anti-inflammatory medications (NSAIDs), activity modification, physical therapy, and injections into the hip joint.  If these non-surgical means fail to alleviate symptoms, hip arthroscopy surgery and certain open hip surgeries are helpful at restoring hip stability and reducing pain.