Sphincter Preserving Anorectoplasty (SPARP) With Anterior Approach: A Revisited and Modified Technique in the...

Surgical management of anorectal malformations (ARM) such as rectoperineal and rectovestibular fistulas frequently involves posterior sagittal anorectoplasty (PSARP). Despite good outcomes, PSARP risks sphincter transection, perineal body dehiscence, and stenosis. We revisited and modified the sphincter-preserving anorectoplasty (SPARP) technique with an anterior approach, hypothesizing that avoiding midline sphincter incision would improve outcomes.

A retrospective review was performed of 46 patients (7 rectovestibular fistulas and 39 rectoperineal fistulas in 14 male and 25 female patients) treated from January 2017 to December 2024. SPARP modification included supine positioning, cruciate incision superficial to the external sphincter complex, intraoperative electrostimulation, and a V-to-Y interdigitating rectoanocutaneous anastomosis. Outcomes measured were perioperative complications, anatomical neoanus placement, stenosis, and continence according to the Rintala Bowel Function Score (RBFS) criteria, over a median 37-month follow-up.

Median age at surgery was 85 days (range 4-319 days); operative time averaged 90 min, and median hospital stay was 8 days. Postoperative complications included partial neoanal suture-line breakdown requiring re-suturing (n = 5), three of which required diverting colostomy. No intraoperative injuries or major bleeding occurred. At median follow-up of 37 months (range 3-89), no patients had perineal body dehiscence, neoanal stenosis, rectal prolapse, misplacement of neoanus, or fecal incontinence according to RBFS.

The modified SPARP with anterior approach avoids sphincter transection, minimizes morbidity from a sagittal incision, and demonstrates excellent anatomical and functional outcomes. SPARP offers a reliable, effective alternative to traditional techniques for managing anorectal malformations with anterior fistulas.

Clinical Research Paper.