How wide a urethra should we produce?

Area of Science:

• Urology
• Pediatric Surgery
• Anatomy

Background:

• Hypospadias repair requires precise neourethra sizing for optimal function.
• The native urethral termination point, at the corpus spongiosum bifurcation, is a crucial anatomical landmark.
• Accurate measurement of the external meatus is vital for tailoring neourethra reconstruction.

Purpose of the Study:

• To establish the correct reference size for neourethra reconstruction in hypospadias repair.
• To determine the optimal measurement point for the external meatus width.
• To correlate external meatus dimensions with the corpus spongiosum bifurcation.

Main Methods:

• Eighty-two male patients (10 months–16 years) undergoing primary hypospadias repair were studied.
• Measurements of external meatus width were taken before and after incising the hypoplastic ventral wall to the corpus spongiosum bifurcation.
• Hegar dilators (1-7.5 mm) were used, and results were compared to normal values.

Main Results:

• Meatus width increased significantly post-incision, from a mean of 2.97 mm to 4.17 mm.
• The post-incision mean width (4.17 mm) closely approximated the normal external meatus width in healthy boys (3.69 mm).
• Incision resulted in a proximal shift of the external meatus, altering its classification.

Conclusions:

• The external meatus width at the corpus spongiosum bifurcation serves as the reference size for neourethra reconstruction.
• Neourethra tailoring should utilize this reference point for size and structural continuity.
• External meatus measurements after incision aid in accurate hypospadias classification and surgical planning.