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Stretched penile length in boys with hypospadias: Population-based analysis using validated nomogram
Prabudh Goel1, Prativa Choudhury1, Devendra Kumar Yadav1
1Department of Paediatric Surgery, All India Institute of Medical Sciences, New Delhi 110029, India.
Insights
Boys with hypospadias, a common birth defect, often have reduced stretched penile length (SPL). This study found SPL reduction is common and not dependent on hypospadias type, supporting routine measurement.
Area of Science:
- Pediatric Urology
- Andrology
- Developmental Biology
Background:
- Hypospadias affects 1 in 200-300 male births, raising parental concerns about penile size.
- Limited data exists on stretched penile length (SPL) in hypospadias patients compared to normative standards.
Purpose of the Study:
- To analyze SPL distribution in boys with Types I and II hypospadias.
- To compare these measurements against established population-based reference data.
Main Methods:
- Studied 876 boys (aged 1-14) with unoperated distal (Type I) or mid-shaft (Type II) hypospadias.
- Utilized the validated SPLINT technique for independent SPL measurements by two observers.
- Compared measurements to normative data from 1276 Indian children using statistical tests.
Main Results:
- A significant leftward shift in SPL distribution was observed: 71% below the 50th percentile and 41.5% below the 25th percentile.
- Mean SPL was reduced by 6.8% in Type I and 7.5% in Type II hypospadias.
- No significant difference in SPL distribution was found between Type I and Type II hypospadias.
Conclusions:
- Boys with distal and mid-shaft hypospadias exhibit clinically significant SPL reduction.
- SPL reduction follows a continuous pattern and is independent of meatal position.
- Routine SPL assessment with population-specific references is recommended for preoperative counseling.
Background:
Hypospadias affects 1 in 200-300 male births. Parents are often concerned about penile adequacy beyond the urethral defect itself, yet few studies have systematically compared stretched penile length (SPL) in hypospadias against population-based reference standards.
Objective:
To evaluate SPL distribution patterns in boys with Types I and II hypospadias and compare them with established normative data.
Methods:
The authors studied 876 consecutive boys aged 1-14 years with unoperated Types I (distal) and II (mid-shaft) hypospadias. Two observers independently measured SPL using the validated SPLINT technique. The SPL measurements were compared against age-matched normative data from 1276 Indian children. Exact binomial probability tests were used for percentile distributions, chi-square tests for subtype comparisons and t-tests for mean deviations.
Results:
The cohort included 479 Type I and 397 Type II cases. SPL distribution showed a marked leftward shift: 71% fell below the 50th percentile (expected 50%, p < 0.001) and 41.5% below the 25th percentile. Lower percentiles were overrepresented, 20.7% were below the 10th percentile and 20.8% in the 10th-25th range. Upper percentiles were depleted: only 7.4% in the 75th-90th range and 1.7% above the 90th percentile (all p < 0.001). Mean SPL was reduced by 6.8% (95% CI: -8.18 to -5.42%) in Type I and 7.5% (95% CI: -9.05 to -5.92%) in Type II. The two subtypes showed no significant distributional difference (χ2 = 6.22, p = 0.18), suggesting that meatal position does not predict SPL reduction.
Conclusions:
Boys with distal and mid-shaft hypospadias show clinically meaningful SPL reduction that follows a continuous distribution rather than an all-or-none pattern. SPL reduction appears independent of meatal position. These findings support routine SPL assessment using population-specific references and can guide preoperative counselling.
