What is a facet joint sprain?
The spine comprises of many bones known as vertebrae. Each vertebra connects with the vertebra above and below via two types of joints: the facet joints on either side of the spine and the discs centrally (figure 1). These joints are designed to support body weight and enable spinal movement. Each facet joint comprises of smooth cartilage which lies between the bony joint surfaces cushioning the impact of one bone on another. Strong connective tissue also wraps around the bony ends providing support to the joint. During certain movements of the spine, stretching or compressive forces are placed on the facet joint. If these forces are excessive and beyond what the facet joint can withstand, injury to the facet joint may occur. This may involve damage to the cartilage or tearing to the connective tissue surrounding the joint. This condition is known as a facet joint sprain.
