The theory is that trauma-informed yoga practice assists traumatised people by helping them re-establish contact with their bodies, connect to their sensory experiences, and increase their emotional awareness.
This has absolutely been my experience with yoga. Yoga has helped me to slow down, listen to my body, to open up rigid parts of my body that were holding stuck energy.
The beautiful thing about yoga is that the healing is gentle. You work with the edge of what your body can do to create change. You learn to tolerate a certain amount of discomfort so the healing can happen in tolerable steps.
Yoga can help with dissociation, numbness, anxiety, stress and difficulty sleeping, all common symptoms of trauma and PTSD. Yoga could be an integrated part of a holistic plan to attend to trauma symptoms.
(This is not intended as advice but as information only)