Lawrenceburg, Kentucky. Lawrenceburg is a home rule-class city in Anderson County, Kentucky, United States. The population was 10,505 at the 2010 census. It is the seat of its county. Lawrenceburg is part of the Frankfort, Kentucky, micropolitan statistical area.
Vacuum phenomenon in the shoulder refers to the presence of intra-articular gas in the shoulder joint.t is a very common occurrence, particularly in external rotation. This can cause circular or linear areas of low signal intensity on GRE MR images of the shoulder obtained with external rotation of the arm and represent small foci of intra-articular gas.
These are thought to occur when the fluid-filled sac within joints gets stretched by a sudden change in joint position. The resulting pressure and volume change, pulls some dissolved gases out of solution [from the joint fluid] and the gases make bubbles that are unstable and pop.