“Leg stiffness” after a microdisc surgery could be from different causes. If the nerve root is scarred and cannot stretch as much as before the disc herniation, this can make the root sensitive to stretch. A new herniation can do the same thing. Hamstring stretches (which also stretch the root) are beneficial as long as you give the root time to recover after your stretching session.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.