title: Cell-based therapy for meniscal repair: a large animal study.
abstract: BACKGROUND
  The avascular portion of the meniscus cartilage in the knee does not have the ability to repair spontaneously.
  
  
  OBJECTIVE
  Cell-based therapy is able to repair a lesion in the swine meniscus.
  
  
  METHODS
  Controlled laboratory study.
  
  
  METHODS
  Sixteen Yorkshire pigs were divided into four groups. A longitudinal tear was produced in the avascular portion of the left medial meniscus of 4 pigs. Autologous chondrocytes were seeded onto devitalized allogenic meniscal slices and were secured inside the lesion with two sutures. Identical incisions were created in 12 other pigs, which were used as three separate control groups: 4 animals treated with an unseeded scaffold, 4 were simply sutured, and 4 were left untreated. Meniscal samples were collected after 9 weeks, and the samples were analyzed grossly, histologically, and histomorphometrically.
  
  
  RESULTS
  Gross results showed bonding of the lesion margins in the specimens of the experimental group, whereas no repair was noted in any of the control group specimens. Histological and histomorphometrical analysis showed multiple areas of healing in the specimens of the experimental group.
  
  
  CONCLUSIONS
  This study demonstrated the ability of seeded chondrocytes to heal a meniscal tear.
  
  
  CONCLUSIONS
  Cell-based therapy could be a potential tool for avascular meniscus repair.
authors.affiliation: Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, USA.
authors.forename: Giuseppe M
authors.initials: GM
authors.lastname: Peretti
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Gill
authors.forename: Jian-Wei
authors.initials: JW
authors.lastname: Xu
authors.forename: Mark A
authors.initials: MA
authors.lastname: Randolph
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Morse
authors.forename: David J
authors.initials: DJ
authors.lastname: Zaleske
mesh_terms: D000818:Animals; D002358:Cartilage, Articular / Q000166:cytology; D019902:Chondrocytes / Q000637:transplantation*; D008592:Menisci, Tibial / Q000473:pathology / Q000601:surgery*; D013552:Swine; D000070600:Tibial Meniscus Injuries; D014945:Wound Healing / Q000502:physiology*