@grrranny It is very common for older folks to get tight hip flexors from sitting too much. That is tightness just inside and in front of the pelvis. It can tighten up the abdomen and put pressure on the guts which is uncomfortable and can slow down transit time causing constipation. The pelvis can also shift out of alignment from this. A physical therapist can help and hopefully get him walking again. Have you discussed this with his doctor? Walking is so important after surgery and spine procedures.