Recurrence Patterns in Pilonidal Sinus Disease Surgery: Navigating Misclassifications and Early Complications

Area of Science:

• Surgical outcomes and patient recovery in Pilonidal Sinus Disease (PSD).
• Medical data analysis and statistical interpretation of surgical recurrence rates.

Background:

• Wound healing complications are frequent after Pilonidal Sinus Disease (PSD) surgery.
• These early complications are often misclassified as recurrence within the first 6-12 months post-operation.

Purpose of the Study:

• To test the hypothesis that misclassification of post-operative wound complications as recurrence is reflected in early versus late annual recurrence rates.
• To quantify the extent of misclassification of recurrences within the first year following PSD surgery.

Main Methods:

• Analysis of post-operative recurrence rates from 1,254 studies (2,030 treatment groups, 140,472 patients).
• Comparison of recurrence rates between studies with <1-year follow-up and studies with ≥1-year follow-up.
• Subanalysis of recurrence rates for different therapeutic strategies.

Main Results:

• First-year recurrence rates were significantly higher in studies with <1-year follow-up (median 6.0%/year) compared to studies with ≥1-year follow-up (median 2.0%/year).
• This discrepancy was observed across various treatments, including primary open treatment, primary midline closure, and Pit Picking techniques.
• The observed difference in recurrence rates (RD) ranged from 4.0% to 16.8% depending on the treatment strategy.

Conclusions:

• The one-year recurrence rate for Pilonidal Sinus Disease surgery includes a substantial proportion of misclassified complications, potentially inflating true recurrence rates by 3-5 times.
• To accurately determine recurrence rates, follow-up periods of less than one year should be avoided.
• Studies with larger sample sizes (n≥200) are recommended to minimize the chance of recurrence rate error.