Influence of failure of primary wound healing on subsequent recurrence of pilonidal sinus. Combined prospective study and randomised controlled trial

Abstract

OBJECTIVE: To find out whether failure of primary wound healing after excision and primary suture for chronic pilonidal sinus predicts recurrence. DESIGN: Follow-up of one prospective study and one subsequent randomised, multicentre study. SETTING: Three teaching hospitals in WesternNorway. SUBJECTS: A total of 197 consecutive patients operated on for chronic pilonidal sinus. INTERVENTIONS: Fifty two patients in the prospective group were given cloxacillin perioperatively. In the randomised study, 145 patients were randomised to have either a single preoperative dose of cefoxitin 2 g intravenously (n = 73) or no prophylaxis (n = 72). Patients were followed up for a median of 7 years. MAIN OUTCOME MEASURES: Recurrence of pilonidal sinus. RESULTS: In the prospective group there were 10 recurrences (19%). In the randomised study 6 patients (8%) who had been given antibiotic prophylaxis had a recurrence compared with 14 patients (19%) who had not been given prophylaxis (p = 0.09). In both groups, failure of primary normal healing was significantly associated with early recurrence (p = 0.0002). Neither the use of antibiotics nor sex had any significant influence on the incidence of recurrences. Most recurrences occurred within the first year. CONCLUSION: Wound complications significantly influenced the recurrence rate whereas antibiotics did not. Most recurrences were seen early.