118: Genital Free Skin Grafts as Dorsal Onlay for Urethral Reconstruction

History and Evolution of Dorsal Onlay Urethroplasty for Bulbar Urethral Stricture Repair using Skin or Buccal Mucosal Grafts

Objectives

To illustrate the history and the evolution over time of bulbar dorsal onlay urethroplasty, comparing outcomes when using buccal mucosa or skin grafts.

Materials and Methods

Ninety-four patients underwent bulbar urethral reconstruction using two dorsal onlay techniques, namely augmented anastomotic urethroplasty and dorsal onlay graft urethroplasty. Preoperative evaluation included clinical history, physical examination, urine culture, residual urine measurement, uroflowmetry and urethrography. Thirty-four patients underwent augmented anastomotic urethroplasty using penile skin (10 cases) or buccal mucosa (24 cases) grafts. Sixty patients underwent dorsal onlay graft urethroplasty using penile skin (38 cases) or buccal mucosa (22 cases) grafts. Forty-eight out of 94 patients received skin grafts and 46 buccal mucosal grafts.

Results

Sixty-four (68%) out of 94 cases were successful, whereas 30 (32%) failed. The 34 augmented anastomotic urethroplasties provided successful outcomes in 24 cases (70.6%), but poor outcomes in 10 (29.4%) cases. The 60 dorsal onlay graft urethroplasty proved to be successful in 42 cases (70%), failing in 18 (30%) cases. Twenty-eight (58.3%) out of 48 penile skin grafts were successful and 20 (41.7%) failed. Thirty-six (78.3%) out of 46 buccal mucosa grafts were successful and 10 (21.7%) failed. The 30 failed cases were then treated with internal urethrotomy in 14 cases (46.7%), perineal urethrostomy in 8 cases (26.7%), two-stage repair in 4 cases (13.3%), and one-stage repair in 4 cases (13.3%).

Conclusions

The dorsal onlay technique used for bulbar urethral stricture repair has changed over time. In our experience, the buccal mucosa seems to be the best substitute graft material for bulbar urethroplasty using dorsal approach.

Dorsal Onlay Skin Graft Bulbar Urethroplasty: Long-Term Follow-Up

OBJECTIVES

To report retrospectively long-term follow-up in a homogeneous group of patients who underwent dorsal onlay skin graft bulbar urethroplasty and to investigate which factors might influence long-term outcome.

METHODS

Thirty-eight patients, with an average age of 43 yr, underwent dorsal onlay skin graft (#12 ventral penile skin and #26 preputial mucosa) bulbar urethroplasty from 1994 to 2000. Of 38 patients, 23 (60.5%) had undergone prior endoscopic procedures. Preoperative evaluation included clinical history, physical examination, retrograde and voiding urethrography, and urethral sonography. Three weeks after surgery, voiding cystourethrography was performed. Patients were followed-up with a clinical evaluation and specific diagnostic tests every 4 mo in the first year and every 12 mo thereafter. Clinical outcome was considered a failure when postoperative instrumentation, including dilation, was needed.

RESULTS

Average follow-up was 111 mo (range, 80-149). Of 38 cases, 25 (65.8%) were successful and 13 (34.2%) failures. Patients with stricture length > 6 cm and a previous history of urethrotomies or dilatations seemed to have a higher risk of failure, but this observation was only a trend and did not reach levels of statistical significance.

CONCLUSIONS

Penile skin used as dorsal onlay graft for bulbar urethral reconstruction in a homogeneous series of patients showed a success rate ranging from 90% at short-term follow-up to 66% after long-term follow-up. There was no evidence for particular risk factors (length of stricture, number of dilatations and urethrotomies) for failure.

Surgical treatment of anterior urethral stricture diseases: brief overview

We performed an up-to-date review of the surgical techniques suggested for the treatment of anterior urethral strictures. References for this review were identified by searching PubMed and MEDLINE using the search terms "urethral stricture" or "urethroplasty" from 1995 to 2006. Descriptive statistics of the articles were provided. Meta-analyses or other multivariate designs were not employed. Out of 327 articles, 50 (15%) were determined to be germane to this review. Eight abstracts were referenced as the authors of this review attended the meetings where the abstract results were presented, thus it was possible to collect additional information on such abstracts. Urethrotomy continues to be the most commonly used technique, but it does have a high failure rate and many patients progress to surgical repair. Buccal mucosa has become the most popular substitute material in urethroplasty; however, the skin appears to have a longer follow-up. Free grafts have been making a comeback, with fewer surgeons using genital flaps. Short bulbar strictures are amenable using primary anastomosis, with a high success rate. Longer strictures are repaired using ventral or dorsal graft urethroplasty, with the same success rate. New tools such as fibrin glue or engineered material will become a standard in future treatment. In reconstructive urethral surgery, the superiority of one approach over another is not yet clearly defined. The surgeon must be competent in the use of various techniques to deal with any condition of the urethra presented at the time of surgery.