What is the open packed position of facet joints?

The open packed position of facet joints refers to the position where the joint surfaces have the least amount of contact and are, therefore, the most mobile and least stable. In the case of the cervical and lumbar spine, this position typically occurs in a neutral posture, where the spine is neither excessively flexed nor extended.

In the neutral position, the facet joints are not under significant compressive or tensile forces, allowing for increased range of motion and less restriction. This is crucial for movements like rotation or flexion and extension, where the joints need to glide smoothly against one another without being overly compressed.

When the spine is flexed or extended, the facet joints become more engaged, increasing the contact area and creating a more stable position, which can limit mobility. Therefore, understanding that neutral is the open packed position highlights the importance of maintaining joint health and range of motion during physical activity and rehabilitation practices. This knowledge is vital for those in the field of manual therapy and rehabilitation to properly assess and treat spinal conditions.