The U.S. is widely considered the bastion of capitalism, and large parts of Scandinavia and Western Europe are considered socialist democracies. However, the truth is every developed country has some programs that are socialist. An extreme form of socialism is communism.
1 A sprain is abnormal stretching or tearing of a ligament that supports a joint. 2  A strain is abnormal stretching or tearing of a muscle or tendon. 3  Sprains and strains may be caused by repetitive activities or by a single event.
Common causes of sprain and strain include: 1  Lifting a heavy object, or twisting the spine while lifting. 2  Sudden movements that place too much stress on the low back, such as a fall. 3  Poor posture over time. 4  Sports injuries, especially in sports that involve twisting or large forces of impact.