Is the levator-urethra gap helpful for diagnosing avulsion?

Area of Science:

• Urogynecology
• Medical Imaging
• Pelvic Floor Disorders

Background:

• Levator avulsion is a key risk factor for female pelvic organ prolapse (POP) and surgical recurrence.
• Accurate diagnosis of levator avulsion is crucial for effective POP management.
• Current imaging diagnosis relies on identifying abnormal muscle insertion on tomographic ultrasound imaging (TUI).

Purpose of the Study:

• To compare the diagnostic performance of qualitative assessment versus quantitative measurement of the levator-urethra gap (LUG) for diagnosing levator avulsion.
• To evaluate the correlation between these two diagnostic methods.
• To validate the diagnostic methods against clinical prolapse and ultrasound findings.

Main Methods:

• Retrospective analysis of 4D translabial pelvic floor ultrasound (US) data from patients with pelvic floor dysfunction.
• Qualitative diagnosis defined as abnormal muscle insertion on TUI.
• Quantitative diagnosis defined by levator-urethra gap (LUG) measurement (≥25 mm on three consecutive slices).

Main Results:

• The qualitative method diagnosed avulsion in 22% of patients, while the quantitative LUG method diagnosed it in 24.3%.
• Good agreement was observed between the two methods, with a kappa of 0.79.
• Avulsion diagnosed by either method correlated with clinical and sonographic prolapse and hiatal ballooning.

Conclusions:

• Both qualitative assessment of TUI slices and LUG measurement demonstrate good agreement for diagnosing levator avulsion.
• The LUG measurement method is a valid alternative for predicting significant prolapse and levator hiatus ballooning.
• These findings support the use of quantitative LUG measurement in diagnosing levator avulsion in urogynecology.