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 area of Texas is 268,820 square miles (696,241 sq km) and the state's 2009 population was 24,782,302. Texas is bordered by the U.S. states of New Mexico, Oklahoma, Arkansas and Louisiana as well as by the Gulf of Mexico and Mexico.