Developmental Dysplasia of the Hip (DDH): Developmental dysplasia of the hip is a congenital (present at birth) condition of the hip joint. It occurs once in every 1,000 live births. The hip joint is created as a ball and socket joint. In DDH, the hip socket may be shallow, letting the "ball" of the long leg bone, also known as the femoral head, slip in and out of the socket. The "ball" may move partially or completely out of the hip socket.
Legg–Calvé–Perthes syndrome is a form of osteochondritis of the hip joint, where growth/loss of bone mass leads to some degree of collapse of the hip joint and to deformity of the ball of the femur and sometimes the surface of the hip socket. It is characterized by idiopathic avascular osteonecrosis of the capital femoral epiphysis of the femoral head leading to an interruption of the blood supply of the head of the femur close to the hip joint.
Feathered Dinosaurs Leapt from Trees, Not the Ground | image: model of a microraptor created to show its gliding capabilities. 1.25.2010 article: "The controversy was that these animals couldn't spread their hind wings to glide… But we've been able to articulate the bones in their hip socket to show that they could fly."
Foot on a Block is probably the pose I use most for releasing the psoas. It is a gravitational release that simply lets the leg hang out of the hip socket pulling on the psoas in the process. This exercise is not limited to your house. If you have hip or groin pain when walking, ...
Fractures of the Pelvis and Acetabulum; Principles and Methods of Management