Total knee replacement may be done on people, usually over 55, whose knees have been damaged by arthritis, trauma, or other destructive diseases of the joint resulting in severe limiting knee pain and significant stiffness, instability (constant giving way) and deformity (lock-knees or bowlegs) of the knee.
The Mexican government has a Federal District, which houses the federal government. The Federal District is a physical place and a territory, bordering Mexico City, which is the country's capital city. This is not counted as one of the states, and is much like the United States' District of Columbia.
In any case, most of the team looked to you for direction, advice, and the important decisions. In a government, this role is usually filled by an executive branch or the leader of the government. In Spain, the functional head of the government is the president and his Council of Ministers. Let's take a closer look at these entities.