After the Civil War , with the protection of the Thirteenth , Fourteenth , and Fifteenth Amendments to the Constitution and the Civil Rights Act of 1866 , African Americans enjoyed a period when they were allowed to vote , actively participate in the political process , acquire the land of former owners , seek their own employment , and use public ...
In the knee, for example, cracking or popping may occur if the patella (knee cap) is slightly out of alignment, and rubs on the adjacent tissues. Other causes of joint noise are the snapping of tendons or scar tissue over a prominence or something referred to as cavitation. Cavitation frequently occurs in synovial joints when a small vacuum forms in the synovial fluid and a rapid release produces a sharp popping or cracking sound.
At the moment your joints pop, you may wonder exactly what is causing it. It's not an uncommon phenomenon. Generally, it is considered normal and nothing to be concerned about, especially if it occurs infrequently and without pain. It can be hard to pinpoint what is causing the popping sensation. There are a few possible causes of popping. It is believed that ligaments can cause the sensation as they tighten when a joint moves. It also can be related to a tendon snapping around a joint. Popping joints can also be due to rough joint surfaces from cartilage loss and osteophytes associated with osteoarthritis.