Surgical Techniques and Approaches for Feline Ovariohysterectomy

Traditional and Innovative Approaches 

Feline ovariohysterectomy offers multiple evidence-based surgical approaches. From traditional midline celiotomies to minimally invasive laparoscopic techniques, today's veterinary surgeon can choose from several validated methods. This article explores the surgical techniques reshaping how we perform this cornerstone procedure. 

The Traditional Midline Approach 

The ventral midline celiotomy remains a widely practiced approach for good reason. This technique provides excellent visualization, straightforward access to both ovaries and the uterine body, and a relatively forgiving learning curve for surgical trainees ¹. 

The technique is well-established: a 2-3 cm incision through skin and linea alba, systematic isolation of each ovary, appropriate pedicle ligation, and closure in layers ². What's evolved isn't the approach itself, but our understanding of how to perform it more efficiently and safely. 

The Pedicle Tie Technique 

A landmark 2022 retrospective study examined 15,927 feline ovariohysterectomies performed using the ovarian pedicle tie technique—essentially auto-ligation where the ovarian pedicle ties upon itself rather than using separate suture material ³. The results? A hemorrhage-related complication rate of just 0.28%, with significantly reduced surgical times compared to traditional double-ligation ³. 

Surgical time matters. Pedicle ties reduced surgery time by approximately 2 minutes per cat compared to double-ligation methods ³. Across thousands of procedures annually, this translates to substantial time savings that reduce anesthetic exposure and increase surgical efficiency. 

The technique requires adequate training and tissue handling competence. Surgeons must ensure proper transection of the suspensory ligament (without damaging the ovarian pedicle itself) and adequate pedicle length for secure auto-ligation ³. Once mastered, it's a genuinely faster method with comparable safety. 

Spay Hooks: Efficiency Tool or Unnecessary Aid? 

The spay hook remains ubiquitous in many practices, but does it improve outcomes? A 2023 randomized controlled study provided answers ⁴. Cats undergoing OHE with a spay hook had significantly shorter operative times (mean difference of about 5-7 minutes) compared to those operated without the hook, particularly when performed by less experienced surgeons ⁴. 

Importantly, intraoperative pain variables and early postoperative pain showed no significant differences between groups ⁴. The spay hook appears to be a legitimate efficiency tool rather than a crutch, particularly valuable in teaching hospitals and high-volume spay-neuter clinics where surgical time directly impacts throughput. 

Use the hook judiciously. Insert it at the cranial end of your incision, press against the left ventrolateral peritoneal surface, rotate toward midline, and carefully extract. The proper ligament and ovary should come along. If you're fishing around excessively or applying excessive force, technique adjustment is needed. 

Laparoscopic-Assisted Ovariohysterectomy 

Minimally invasive surgery has arrived in feline veterinary medicine. Laparoscopic-assisted ovariohysterectomy (LAOHE) in cats is gaining traction, and recent evidence supports benefits beyond marketing appeal. 

A 2024 prospective randomized trial compared open OHE with two-port LAOHE in 40 cats ⁵. The results were compelling: cats in the LAOHE group exhibited significantly lower pain scores at 1, 2, and 4 hours postoperatively ⁵. Cortisol levels—a validated stress biomarker—were also significantly lower in the LAOHE group ⁵. Surgical times were comparable between approaches (36.7 minutes for open versus 42.6 minutes for LAOHE), suggesting that with proper training, the efficiency gap narrows considerably ⁵. 

The LAOHE Technique 

The procedure employs a two-port approach: a camera portal established 1-1.5 cm caudal to the umbilicus, and an instrument portal placed 4-5 cm further caudal ⁵. After achieving pneumoperitoneum (5-7 mmHg pressure), percutaneous suspension sutures elevate each ovary toward the abdominal wall for vessel sealing device application. Both uterine horns are then exteriorized through the instrument port for final ligation ⁵. 

The advantages? Reduced tissue trauma, improved visualization, and quantifiably less post-operative pain and stress ⁵. The disadvantages? Equipment costs, technical learning curve, and the reality that laparoscopy in small feline abdomens requires patience and practice. 

Flank Approach Considerations 

The lateral flank approach deserves mention, though it's less commonly used in contemporary practice ². While it offers cosmetic advantages and potentially reduces midline tension in obese cats, it provides limited uterine body access and can make bilateral ovariectomy technically challenging ². Most current evidence favors midline approaches for routine cases. 

Surgical Efficiency Principles 

Regardless of approach, certain principles optimize efficiency without compromising safety. Sharp transection of the suspensory ligament—done carefully to avoid inadvertent pedicle damage—reduces manipulation time and tissue trauma ³. This simple modification saves over 1 minute per surgery, accumulating to significant time savings across high-volume practices ³. 

Adequate exposure is critical. Don't compromise surgical precision through a too-small incision. The goal is visualization and controlled manipulation, not minimizing incision length at the expense of surgical precision. An extra centimeter of incision heals without consequence; a dropped pedicle does not. 

Hemostasis: Essential Principle 

Whether using traditional suture ligation, pedicle ties, or vessel sealing devices, hemostasis must be secure before closing. The ovarian arteries branch directly from the aorta and will hemorrhage significantly if inadequately ligated ³. Take time to ensure your ligatures or vessel seals are properly placed, adequately tightened, and definitively hemostatic before releasing tissue. 

Vessel sealing devices (VSDs) have become increasingly popular, particularly in laparoscopic procedures. These devices provide reliable hemostasis with minimal thermal spread, though they require equipment investment and proper training ⁵. Studies comparing VSDs to traditional ligation show comparable safety profiles when used appropriately ⁵. 

The Ovariectomy versus Ovariohysterectomy Debate 

Should we remove the uterus at all? European practices often perform ovariectomy alone, and evidence suggests no long-term outcome differences between ovariectomy and ovariohysterectomy in healthy cats ⁶. Ovariectomy involves shorter surgical times and less tissue manipulation, potentially translating to reduced post-operative discomfort ⁶. 

North American practices largely continue performing complete OHE, partly due to tradition and partly due to the theoretical (though exceedingly rare) risk of uterine pathology in retained uterine tissue ⁶. A 2018 study comparing both techniques in cats found no significant difference in postoperative pain intensity between groups, though ovariectomy may offer advantages through reduced tissue manipulation ⁶. The decision often comes down to practitioner training, client expectations, and regional standards. 

Special Circumstances 

Pregnant queens, cats with pyometra, and those with ovarian pathology each present unique surgical challenges ⁷. Increased vascularity demands meticulous hemostasis, friable tissues require gentle handling, and extended surgical times necessitate robust anesthetic support ⁷. Set realistic expectations with clients, ensure adequate assistance, and proceed methodically in these higher-risk cases. 

The Take-Home Message 

Surgical technique matters significantly. Whether performing traditional midline OHE with pedicle ties, exploring laparoscopic approaches, or finding your evidence-based approach, principles remain consistent: adequate exposure, secure hemostasis, minimal tissue trauma, and technical competence. Stay current with literature, consider incorporating validated efficiency techniques, and remember that the best surgical approach is the one you perform safely and consistently. 

The future of feline OHE is evolving. From pedicle ties reducing surgical times to laparoscopic techniques demonstrably reducing postoperative pain, we have more tools than ever to optimize patient outcomes. Choose wisely, practice deliberately, and always prioritize patient welfare over surgical speed. 

References 

1. Freeman LJ, Ferguson N, Fellenstein C, Johnson R. Evaluation of learning curves for ovariohysterectomy of dogs and cats and castration of dogs. J Am Vet Med Assoc. 2017;251(3):322-328. 

2. McGrath H, Hardie RJ, Davis E. Lateral flank approach for ovariohysterectomy in small animals. Compend Contin Educ Pract Vet. 2004;26(12):922-930. 

3. Rigdon-Brestle K, Accornero VH, Amtower M, Slater MR. Retrospective review reveals few complications of ovarian pedicle tie in 15,927 cats undergoing ovariohysterectomy at a large HQHVSN clinic and training facility in the United States: 2017-2018. J Am Vet Med Assoc. 2022;260(S2):S28-S35. 

4. de Menezes MP, de Faria LG, Franco GG, et al. Intraoperative and early postoperative pain in cats that underwent ovariohysterectomy using a spay hook: a randomised, masked, experimental study. BMC Vet Res. 2023;19(1):154. 

5. Jeong C, Yi K, Yu Y, Heo S. Comparison of postoperative pain and stress using a multimodal approach in cats: open vs. laparoscopic-assisted ovariohysterectomy. Front Vet Sci. 2024;11:1519773. 

6. Pereira MAA, Gonçalves LA, Evangelista MC, et al. Postoperative pain and short-term complications after two elective sterilization techniques: ovariohysterectomy or ovariectomy in cats. BMC Vet Res. 2018;14:335. 
7. Kreisler RE, Douglas ML, Harder KN. Blood loss and coagulation profile in pregnant and non-pregnant queens undergoing elective ovariohysterectomy. J Feline Med Surg. 2021;23(10):875-882.