Repeatability in measuring curvature in Peyronie's disease

Area of Science:

• Urology
• Andrology
• Medical Imaging

Background:

• Peyronie's disease (PD) diagnosis and management guidelines recommend curvature assessment during induced erections.
• A standardized protocol for measuring penile curvature is lacking, leading to significant interobserver variability.
• This variability complicates treatment evaluation and clinical trial comparisons.

Purpose of the Study:

• To assess the interobserver reliability of penile curvature measurements in patients with PD.
• To determine if image annotation improves measurement consistency.
• To compare measurement consistency between home-captured and clinic-induced erection images.

Main Methods:

• Four urologists independently measured penile curvature in 22 PD patients.
• Two sets of images per patient were analyzed: home-captured and clinic-induced (alprostadil).
• Standardized lateral and dorsal views were used; the impact of assisting lines was evaluated.

Main Results:

• High interobserver agreement was found, with Intraclass Correlation Coefficient values between 0.77 and 0.88.
• Assisting lines did not significantly enhance measurement repeatability.
• No significant difference in reproducibility was observed between home-based and clinic-induced erection images.

Conclusions:

• Penile curvature measurements in PD exhibit high interobserver reliability.
• Measurement consistency is not significantly affected by photographic conditions or the use of assisting lines.
• Standardization of PD curvature assessment is needed, despite high observer reliability.