Introduction to Surgical Challenges

Laparoscopic sacrocolpopexy (LSC) remains the gold standard for treating apical pelvic organ prolapse. However, surgeons often face technical difficulties when identifying the sacral promontory. Recent research highlights how the Double-Hump Deformity in LSC acts as a significant anatomical risk factor. This deformity, characterized by anterior protrusions of the L4-L5 and L5-S1 disks, can obscure vital surgical landmarks. Consequently, understanding this spinal variation is essential for improving surgical precision and patient safety.

Defining the Double-Hump Deformity

The double-hump deformity involves specific sagittal protrusions in the lumbosacral spine. Specifically, it occurs when the L4-L5 and L5-S1 intervertebral disks bulge anteriorly. These protrusions alter the natural angulation of the spine. Researchers measured these changes using sagittal computed tomography (CT) to assess their clinical impact. Their findings show that this deformity reduces the L5-S1 intervertebral angle significantly. Because of this structural change, the sacral promontory becomes less visible during the laparoscopic approach.

Impact of Double-Hump Deformity in LSC on Clinical Outcomes

Surgeons must maintain a clear view of the sacral promontory to ensure accurate mesh placement. Unfortunately, the double-hump deformity often impairs this visibility. In a prospective study of 184 women, patients with this deformity experienced higher rates of surgical landmark obscuration. Additionally, postoperative CT scans revealed a greater incidence of mesh malposition in these cases. Although operative time and blood loss did not change significantly, the risk of technical error increased. Therefore, preoperative CT screening might help identify high-risk patients before they enter the operating room.

FAQs

What is the double-hump deformity in the context of pelvic surgery?

It is an anatomical variation where the L4-L5 and L5-S1 disks protrude anteriorly. This deformity reduces the workspace and obscures the sacral promontory during laparoscopic procedures.

How does this deformity affect mesh placement?

Because the deformity hides the standard surgical landmarks, surgeons may struggle to fix the mesh in the optimal position. This increases the risk of mesh malposition, which could lead to recurrence or complications.

Should surgeons use preoperative imaging for all LSC cases?

Preoperative sagittal CT scans allow surgeons to measure lumbosacral angles. This helps in predicting surgical difficulty and planning the dissection more accurately to avoid obscured landmarks.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or a professional relationship. Always seek the advice of a qualified healthcare provider for any medical condition. Refer to the latest local and national guidelines for clinical practice.

References

Sato H et al. Sagittal Double-Hump Deformity of the Lumbosacral Spine: An Anatomical Risk Factor for Surgical Landmark Obscuration During Laparoscopic Sacrocolpopexy. Neurourol Urodyn. 2026 Feb 09. doi: 10.1002/nau.70228. PMID: 41657298.

Gousse AE, et al. Laparoscopic sacrocolpopexy: complications and technical challenges. International Urogynecology Journal. 2020.

Whitehead WE, et al. Anatomy of the sacrum and its significance in pelvic floor surgery. American Journal of Obstetrics and Gynecology. 2018.