title: Delaminated rotator cuff tear: extension of delamination and cuff integrity after arthroscopic rotator cuff repair.
abstract: BACKGROUND
  The purpose of this study was to evaluate the extension of delamination and the cuff integrity after arthroscopic repair of delaminated rotator cuff tears.
  
  
  METHODS
  Sixty-five patients with delaminated rotator cuff tears were retrospectively reviewed. The delaminated tears were divided into full-thickness delaminated tears and partial-thickness delaminated tears. To evaluate the medial extension, we calculated the coronal size of the delaminated portion. To evaluate the posterior extension, we checked the tendon involved. Cuff integrity was evaluated by computed tomography arthrography.
  
  
  RESULTS
  The mean medial extension in the full-thickness and partial-thickness delaminated tears was 18.1 ± 6.0 mm and 22.7 ± 6.3 mm, respectively (P = .0084). The posterior extension into the supraspinatus and the infraspinatus was 36.9% and 32.3%, respectively, in the full-thickness delaminated tears, and it was 27.7% and 3.1%, respectively, in the partial-thickness delaminated tears (P = .0043). With regard to cuff integrity, 35 cases of anatomic healing, 10 cases of partial healing defects, and 17 cases of retear were detected. Among the patients with retear and partial healing of the defect, all the partially healed defects showed delamination. Three retear patients showed delamination, and 14 retear patients did not show delamination; the difference was statistically significant (P = .0001).
  
  
  CONCLUSIONS
  The full-thickness delaminated tears showed less medial extension and more posterior extension than the partial-thickness delaminated tears. Delamination did not develop in retear patients, but delamination was common in the patients with partially healed defects.
authors.affiliation: Department of Orthopaedics, Busan Paik Hospital, College of Medicine, Inje University, Busan, South Korea.
authors.forename: Heui-Chul
authors.initials: HC
authors.lastname: Gwak
authors.affiliation: Department of Orthopaedics, Busan Paik Hospital, College of Medicine, Inje University, Busan, South Korea.
authors.forename: Chang-Wan
authors.initials: CW
authors.lastname: Kim
authors.affiliation: Department of Orthopaedics, Busan Paik Hospital, College of Medicine, Inje University, Busan, South Korea. Electronic address: kimjunghan74@gmail.com.
authors.forename: Jung-Han
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Radiology, Busan Paik Hospital, College of Medicine, Inje University, Busan, South Korea.
authors.forename: Hye-Jeung
authors.initials: HJ
authors.lastname: Choo
authors.affiliation: Department of Orthopaedics, Busan Paik Hospital, College of Medicine, Inje University, Busan, South Korea.
authors.forename: Seung-Yeob
authors.initials: SY
authors.lastname: Sagong
authors.affiliation: Medical Student, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
authors.forename: John
authors.initials: J
authors.lastname: Shin
mesh_terms: D000368:Aged; D001175:Arthrography; D001182:Arthroscopy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D012189:Retrospective Studies; D017006:Rotator Cuff / Q000000981:diagnostic imaging* / Q000601:surgery; D000070636:Rotator Cuff Injuries; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014945:Wound Healing
keywords: Delamination; cuff integrity; extension; rotator cuff tear