Sacro-Iliac Joint:

Sacro-Iliac joint or in short SI joint is the most affected joint when it comes to Lower Back pain.Especially in Non-specific Lower Back pain SI joint gets affected mostly.Naturally this Joint does not have enough mobility and on top due to incorrect posture and prolonged sitting makes this Joint very stiff and almost immovable.Which in turn causing immobility to your Lower Back and leads to postural changes.Due to immobile SI joint muscles attaches and originated from it gets stiffer and weaker as well.Stiff SI joint is one of the reasons that people gets the Lower Back spasm frequently