As it turns out we made some improvements today. Pt had stiffness of left sided L3-5 and corresponding muscle spasm. Palpation and joint mobs in this area referred pain down the left leg. I then did some right rotation PPVIMs as per previous sessions (which usually eases leg pain) however today this seemed to be worsening leg symptoms.
I switched direction to left rotation PPVIMs and the leg pain eased altogether, there was only very slight local lower back pain and extension was much better (about 5 deg more and importantly it was painfree). I have a suspicion that he has turned a corner now- that we can start working into the stiffness as his body is allowing that now. Once we get more extension I think the rest will follow -being able to get a good neutral spine position for postural retraining and core stability exercises. I will keep everyone posted on this