Many years ago, I was thrown off by my horse and suffered a double spinal fracture (fortunately with no nerve damage). I was kept in a hospital bed for a number of days and was unable to urinate. None of the techniques the nurses tried to make me “go” worked and they had a catheter ready for use. Then a PT came with a corset so that they could get me up walking. After she put the corset on, I felt an urge to urinate and was successful. I strongly suggest that you discuss using a corset with your surgeon before trying it. Perhaps some external pressure on your bladder would ease your problem.