The groin is located on the anterior medial aspect of the hip joint and is a groove in the lower abdomen where the pubic symphysis joins the root of the thigh. This groove is oblique and is a diagonal groove that extends from the outer upper part of the hip joint to the perineum. This groove contains the inguinal ligaments, local lymph nodes, and also the vascular nerves connecting to the perineum, and deeper, the acetabulum of the hip joint as well as the head and neck of the femur. If there is abnormal pain in this location, there may be infection and inflammation of the inguinal lymph nodes, as well as hip arthritis, and in severe cases, aseptic necrosis of the femoral head.