You apparently underwent an ALIF (anterior lumbar interbody fusion) and had a general or thoracic surgeon perform the approach. When the belly wall is incised, muscle is cut and nerves are stretched. This can make the belly wall distend in this region as the muscles initially are non-functional. I would give this region some time to heal. The muscles can recover somewhat (see nerve injury and healing).
If this belly area is really distended and the approach surgeon feels like this distention is way out of the normal for this time in healing, you might consider a reexploration. This is as long as this surgeon is comfortable with repairing this type of disorder and has had lots of experience.
There are “sports hernia” surgeons who do nothing but this type of repair. You could search them out and obtain an opinion.
Dr. Corenman
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.