Symphysis pubis dysfunction (SPD) is a problem with the pelvis. Your pelvis is mainly formed of two pubic bones that curve round to make a cradle shape. The pubic bones meet at the front of your pelvis, at a firm joint called the symphysis pubis.The joint's connection is made strong by a dense network of tough tissues (ligaments).our pelvis is mainly formed of two pubic bones that curve round to make a cradle shape. The pubic bones meet at the front of your pelvis, at a firm joint called the symphysis pubis. The joint's connection is made strong by a dense network of tough tissues (ligaments).