Diplegic cerebral palsy is officially called Spastic Diplegia/Diparesis. This form of cerebral palsy is characterized by the worst muscle stiffness occurring in the legs. There may be stiffness in the arms and face but the worst symptoms are in the leg muscles. In many cases of Spastic Diplegia the person has tight leg muscles that cause the arms to move in a scissor-like motion. There are problems with balance and coordination and leg muscles may even be short. The person's range of motion is limited and he or she will probably require a leg brace or a walking aid. Some people have a tight Achilles tendon which draws up forcing the person to walk on their toes. With feet and ankle problems and a difficult gait in addition to tight muscles, it is not unusual for the hips to dislocate unless preventive action is taken. The symptoms in this form of cerebral palsy are almost always limited to muscle development and control issues and do not include impairment of intelligence.