Just out of interest, or for anyone else wondering the same thing as me, here is some information from a paper by Remzi et al in 2015:
Preoperative Evaluation
Patients underwent a comprehensive clinical examination before redo IPAA surgery. Although perioperative evaluation has evolved through the years, in all cases, there was an accurate and detailed history of the presenting symptoms and the prior pouch surgery. For patients referred to us, this included both operative records and pathology reports and usually the pathology slides on which the report was based. Then according to the clinical situation and presumptive diagnosis, we obtained some or all of the following: examination under anesthesia, flexible pouchoscopy, gastrografin enema, magnetic resonance imaging, computed tomography or computed tomography – enterography, and anal physiology testing. Since 2001, preoperative testing has usually been coordinated through our pouch center.
Operative Approach
Patients are placed in the Lloyd-Davies position and both abdomen and perineum are prepared for operation. Ureteral stents are placed in majority of patients. The previous incision is used for laparotomy or a midline incision is made for those previously operated by laparoscopic technique. The pouch is mobilized to the pelvic floor with sharp dissection. The decision on whether to resect the old pouch and create a new one or to repair/revise/reattach the old pouch is made by the operating surgeon and depends on the viability and integrity of the mobilized pouch, the reach of the proposed new pouch, and the cause of pouch failure. Although a handsewn IPAA with mucosectomy was usually performed, a stapled IPAA was done if there was a rectal stump long enough for a linear stapler to be applied below the current anastomosis.
For a handsewn anastomosis, the anus was distracted by a series of anal everting sutures and a mucosectomy performed to a level just above dentate line. The pouch was pulled through the pelvis and anastomosed with a series of interrupted 2/0 polyglycolic acid sutures. If access to the top of the anal canal was difficult, a minimum of 4 sutures were placed, 1 in each of the 4 quadrants, before the pouch was pulled through. As these were tied, the pouch was manipulated into place. The IPAA was sometimes then stented with a 22 F mushroom catheter that was sutured in place and kept until the patient’s discharge from hospital or 4 to 6 weeks after the operation. All but 25 patients had fecal diversion, using either the preexisting ileostomy or a new diverting loop ileostomy. Ileostomy closure was usually scheduled 3 months after redo IPAA surgery. Preclosure contrast enema and intraoperative digital anal examination and pouchoscopy were used to confirm pouch and anastomotic integrity. If any complication was noticed, ileostomy reversal was delayed and the complication treated.
"Transabdominal Redo Ileal Pouch Surgery for Failed Restorative Proctocolectomy: Lessons Learned Over 500 Patients"
https://journals.lww.com/annal...y_for_failed.15.aspx