title: Volume of procedures and risk of recurrence after repair of groin hernia: national register study.
abstract: OBJECTIVE
  To determine whether the association between volume and outcome found in major surgery also holds true for a minor operation.
  
  
  METHODS
  Review of outcomes after hernia surgery in Sweden.
  
  
  METHODS
  Surgical units registered with the Swedish hernia register, which in 2004 covered about 95% of all hernia operations in Sweden.
  
  
  METHODS
  86,409 patients over 15 years, who underwent 96,601 unilateral or bilateral groin hernia repairs (94,077 inguinal and 2524 femoral) in 1996-2004 at the participating surgical units.
  
  
  METHODS
  Re-operation for recurrence.
  
  
  RESULTS
  There was a significantly higher rate of re-operation in surgeons who carried out 1-5 repairs a year than in surgeons who carried out more repairs. There was no association between outcome and further increases in volume. Although about half of surgeons in Sweden who repair hernias are low volume operators, they performed only 8.4% of all repairs.
  
  
  CONCLUSIONS
  Sweden's numerous low volume hernia surgeons perform such a small proportion of all operations that the impact of their inferior results on the nationwide re-operation rate is minimal. Volume indicates an approximate minimum value for the number of hernia repairs a surgeon should do each year but the outcome in surgeons who carry out more than that number disqualifies volume as an indicator of proficiency.
authors.affiliation: Department of Surgery, Ostersund Hospital, S 83183, Ostersund, Sweden. par.nordin@jll.se
authors.forename: Pär
authors.initials: P
authors.lastname: Nordin
authors.forename: Willem
authors.initials: W
authors.lastname: van der Linden
mesh_terms: D016009:Chi-Square Distribution; D013502:General Surgery / Q000706:statistics & numerical data*; D006276:Health Facility Size; D006552:Hernia, Inguinal / Q000601:surgery*; D006761:Hospitals / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D012008:Recurrence; D012042:Registries; D012307:Risk Factors; D013514:Surgical Procedures, Operative / Q000706:statistics & numerical data*; D013548:Sweden; D016526:Workload / Q000706:statistics & numerical data