I have not posted in a long time.  My apologies.  I have sent out the monthly newsletter.  You can find past editions at: The Renkens Center. Click on the page entitled 'Newsletter'.  Recently, a curious patient asked me what I thought was the most important muscle to rehab when it comes to low back pain. Contrary to what is typically written about and talked about in the literature, my answer is the latissimus dorsi. Why? Because it covers almost the entire back (T5 - L5 and the pelvis) and has a large cross-sectional area, its angle of orientation (it can stabilize the low back, and it networks itself with the thoracolumbar and lumbodorsal fascia.  All this and if it works properly, it can effectively extend the spine.  All of this means the lats have more potential to produce extension and rotation and to generate torque and compression than the smaller (and more often cited) muscles of the low back, including the multifidi, rotatores, and erector spinae.  When trained and used properly, the lats do much more to stabilize and protect our low back than the smaller muscles with lower thresholds for activation and minimal ability to both produce and resist spinal movement.