Arthritis leads to joint locking because as cartilage wears away, the ends of the bones that form a joint become rough. With severe disease, bone rubs on bone. As the joint moves, the rough edges can catch on one another.
State of Texas. Home. Texas is a state located in the American South and Southwest regions of the United States of America. With an area of 261,797 square miles (678,051 km) and a population of 23.5 million in 254 counties, the state is second-largest in both area and population. About half the state's population resides in Dallas-Fort Worth and Houston metropolitan areas.
The northern portion of Texas lies in the Tornado Alley, which extends from central Texas northward to Illinois and Indiana. A population of 26 million (2012 est) makes Texas the second most populous state in the US (behind California). Capital city is Austin; largest city and a primary port is Houston, second-largest city in Texas is San Antonio, largest metropolitan area is Dallas â Fort Worth.