title: Preservation of the ulnar bursa within the carpal tunnel: does it improve the outcome of carpal tunnel surgery? A randomized, controlled trial.
abstract: BACKGROUND
  It was hypothesized that preserving a layer of gliding tissue, the parietal layer of the ulnar bursa, between the contents of the carpal tunnel and the soft tissues incised during carpal tunnel surgery might reduce scar pain and improve grip strength and function following open carpal tunnel decompression.
  
  
  METHODS
  Patients consented to randomization to treatment with either preservation of the parietal layer of the ulnar bursa beneath the flexor retinaculum at the time of open carpal tunnel decompression (fifty-seven patients) or division of this gliding layer as part of a standard open carpal tunnel decompression (sixty-one patients). Grip strength was measured, scar pain was rated, and the validated Patient Evaluation Measure questionnaire was used to assess symptoms and disability preoperatively and at eight to nine weeks following the surgery in seventy-seven women and thirty-four men; the remaining seven patients were lost to follow-up.
  
  
  RESULTS
  There was no difference between the groups with respect to age, sex, hand dominance, or side of surgery. Grip strength, scar pain, and the Patient Evaluation Measure score were not significantly different between the two groups, although there was a trend toward a poorer subjective outcome as demonstrated by the questionnaire in the group in which the ulnar bursa within the carpal tunnel had been preserved. Preserving the ulnar bursa within the carpal tunnel did, however, result in a lower prevalence of suspected wound infection or inflammation (p = 0.04).
  
  
  CONCLUSIONS
  In this group of patients, preservation of the ulnar bursa around the median nerve during open carpal tunnel release produced no significant difference in grip strength or self-rated symptoms. We recommend incision of the ulnar bursa during open carpal tunnel decompression to allow complete visualization of the median nerve and carpal tunnel contents.
authors.affiliation: Department of Trauma and Orthopaedic Surgery, Queen's Medical Centre, University Hospital, Nottingham NG7 2UH, United Kingdom. daren.forward@virgin.net
authors.forename: D P
authors.initials: DP
authors.lastname: Forward
authors.forename: A K
authors.initials: AK
authors.lastname: Singh
authors.forename: T M
authors.initials: TM
authors.lastname: Lawrence
authors.forename: J S
authors.initials: JS
authors.lastname: Sithole
authors.forename: T R C
authors.initials: TR
authors.lastname: Davis
authors.forename: J A
authors.initials: JA
authors.lastname: Oni
mesh_terms: D002061:Bursa, Synovial / Q000502:physiology*; D002349:Carpal Tunnel Syndrome / Q000601:surgery*; D002921:Cicatrix; D005260:Female; D018737:Hand Strength; D006801:Humans; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength; D010149:Postoperative Pain / Q000517:prevention & control; D011795:Surveys and Questionnaires; D016896:Treatment Outcome; D014457:Ulna; D014953:Wrist