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.
Popliteus Injury. The Popliteus is a small muscle located at the back of the knee joint. An injury or strain to the muscle or tendon can cause pain at the back of the knee.ymptoms of a popliteus injury include pain at the back of the knee joint. There will be tenderness when pressing in at the back of the knee. Pain will be reproduced when the knee is bent against resistance whilst the lower leg or tibia bone is rotated outwards. Athletes with this injury commonly have tight hamstrings.