title: Serial Changes of the Cartilage in Recipient Sites and Their Mirror Sites on Second-Look Imaging After Mosaicplasty.
abstract: It has been reported that the short-term results of mosaicplasty are good, but there have been no reports of the serial cartilage changes in the recipient sites and their mirror sites for mosaicplasty.
  
  
  
  To examine the serial changes in cartilage in the recipient sites and their mirror sites using second-look imaging.
  
  
  
  Case series; Level of evidence, 4.
  
  
  
  A total of 33 patients (37 knees, 40 sites) underwent mosaicplasty and second-look arthroscopy at a single institution over a 7-year period. There were 14 men and 19 women (12 right knees and 25 left knees). The recipient sites were the patella (n = 3), trochlea (n = 7), medial femoral condyle (n = 21), and lateral femoral condyle (n = 9). The mean patient age at surgery was 38.3 years; the mean period from mosaicplasty to second-look arthroscopy was 15.4 months; and the mean follow-up period was 34.9 months (range, 24-65 months). The results of second-look arthroscopy at the recipient site were categorized as cartilage with a smooth surface (group S) and fibrillation or an irregular surface (group I), and results of second-look arthroscopy at the mirror site were categorized as worse (group W), improved (group E), and unchanged (group U).
  
  
  
  There were 30 sites in group S, 10 sites in group I, 3 sites in group W, 4 sites in group E, and 33 sites in group U. The age at operation was significantly greater in group S than in group I. There was a significant correlation between group S and groups E and U. The clinical outcome was significantly worse in group W when compared with groups E and U.
  
  
  
  If a smooth surface was seen in the recipient site during second-look arthroscopy, the cartilage degeneration in its mirror site did not become worse after mosaicplasty.
authors.affiliation: Department of Orthopaedic Surgery, National Hospital Organization, Kyoto Medical Center, Kyoto, Japan ynaka@kuhp.kyoto-u.ac.jp.
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Nakagawa
authors.affiliation: Department of Orthopaedic Surgery, National Hospital Organization, Kyoto Medical Center, Kyoto, Japan.
authors.forename: Shogo
authors.initials: S
authors.lastname: Mukai
authors.affiliation: Department of Orthopaedic Surgery, National Hospital Organization, Kyoto Medical Center, Kyoto, Japan.
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Yabumoto
authors.affiliation: Department of Orthopaedic Surgery, National Hospital Organization, Kyoto Medical Center, Kyoto, Japan.
authors.forename: Eri
authors.initials: E
authors.lastname: Tarumi
authors.affiliation: Department of Orthopaedic Surgery, National Hospital Organization, Kyoto Medical Center, Kyoto, Japan Department of Orthopaedic Surgery, Faculty of Medicine, Kyoto University, Kyoto, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakamura
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001182:Arthroscopy / Q000706:statistics & numerical data; D064592:Autografts / Q000502:physiology / Q000601:surgery*; D002358:Cartilage, Articular / Q000502:physiology / Q000601:surgery*; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D024162:Second-Look Surgery / Q000706:statistics & numerical data; D014182:Transplantation, Autologous / Q000706:statistics & numerical data; D055815:Young Adult
keywords: mirror area; mosaicplasty; second-look arthroscopy; smooth surface