Abstract
Purpose To investigate whether non-autologous transplantation of human umbilical cord blood-derived mesenchymal stem cells (hUCB-MSCs) could be integrated safely at the bone-tendon junction without immune rejection and could enhance bone-tendon healing effectively during anterior cruciate ligament (ACL) reconstruction in an animal model. Methods ACL reconstructions using hamstring tendons were performed in 30 adult rabbits. The bone tunnels were treated with hUCB-MSCs or were untreated. The specimens were harvested at 4, 8, and 12 weeks. We performed a gross examination of the knee joint; a histologic assessment using H&E staining, as well as immunohistochemical staining, for type II collagen; and an evaluation of bone tunnel widening using micro-computed tomography. Results No evidence of immune rejection was detected. Tendon-bone healing through Sharpey-like fibers was noticed around tendon grafts at 12 weeks in the control group. A smooth transition from bone to tendon through broad fibrocartilage formation was identified in the treatment group, and the interface zone showed abundant type II collagen production on immunohistochemical staining. Histologic scores for bone-tendon healing were significantly higher in the treatment group at all time points (P <.001). Micro-computed tomography at 12 weeks showed a significantly smaller tibial (P =.029) and femoral (P =.033) bone tunnel enlargement in the treated group than in the control group. Conclusions Non-autologous transplantation of hUCB-MSCs was applied in ACL reconstruction without early immune rejection. There was enhanced tendon-bone healing through broad fibrocartilage formation with higher histologic scores and decreased femoral and tibial tunnel widening compared with the control group (79.2% and 80%, respectively, of the control group tunnel area at 12 weeks). Clinical Relevance Non-autologous transplantation of hUCB-MSCs has therapeutic potential in promoting tendon-to-bone healing after ACL reconstruction. Further study in the human model is warranted.
Original language | English |
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Pages (from-to) | 1530-1539 |
Number of pages | 10 |
Journal | Arthroscopy - Journal of Arthroscopic and Related Surgery |
Volume | 31 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2015 Aug 1 |
Externally published | Yes |
Bibliographical note
Funding Information:The authors report the following potential conflict of interest or source of funding: Supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology ( 2012044586 ).
Publisher Copyright:
© 2015 Arthroscopy Association of North America.
ASJC Scopus subject areas
- Orthopedics and Sports Medicine