These are a few studies found about Tuina and its efficacy. The amount of research into massage and Tuina is staggering but, as I find good studies I will share them here.
Effectiveness of Tuina for Chronic Low Back Pain
TCM for treating Chronic Neck Pain and Chronic Low Back Pain
TCM for Chronic Low Back Pain
An interesting Study on Auricular Therapy (Ear Acupuncture/Acupressure) for Low Back Pain: