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.
Another common problem that results in a popping or grinding sensation is roughness on the undersurface of the patella that used to be called chondromalacia and is often labeled as patellofemoral pain syndrome, or runnerâs knee. Often you may feel the popping, grinding or crunching more than you can hear it. To feel this, try squatting with your hand flat over the front of your knee. Real worry: When a patient says to me, âDoc, I heard a pop and my knee swelled,â it is definitely a cause for concern.