An ovariectomy differs from an ovariohysterectomy in that only the ovaries are removed, leaving the uterus in place. According to reports comparing the two techniques, it was found that ovariectomy is less invasive and eliminates the risk of ureter ligation at the uterine body. All other known risks are comparable between the two procedures.
According to dvm360:
“Laparoscopic procedures have become increasingly available and demanded by our clientele because of the benefits of decreased patient morbidity (less postoperative pain and quicker return to normal activity).”
Ovariectomy has been the preferred surgery for years in many European communities. In the U.S., ovariohysterectomy (spaying) is by far the most commonly performed sterilization procedure on female pets.