Distractors
The psoas works tirelessly while the QL doesn’t pull its weight.
They are independent in all ways.
The psoas is responsible for trunk extension and the QL handles trunk flexion.
Key
They share a significant layer of fascia.
Question
In the column, “The QL and the Psoas,” author Allison Denney says one of the most important pieces of information an MT should know about the relationship of the QL and the psoas is: