I had a multilevel lumbar fusion on 12-2-2015 and have had a problem with a lump in my muscle that won't release with PT. An MRI done on 2-24-2018 looks suspicious. It looks as if a braided cord with a plastic sheath is pinching the muscle. Doc says its the connector bar but it doesn't appear to be a rod. So far I am not getting any real answers... I'd like to put up a picture but don't see that I can do this.