How much movememt does sacro-iliac joint allow?

The sacroiliac joint allows for a limited range of movement, primarily providing stability and support to the pelvis. It facilitates small amounts of gliding and rotation, typically around 2 to 4 degrees in each direction during activities like walking and bending. This minimal movement helps absorb shock and maintain alignment between the spine and pelvis. Overall, its primary function is to transfer weight and forces between the upper body and lower limbs.