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Enhancement of rotator cuff tendon–bone healing with injectable periosteum progenitor cells-BMP-2 hydrogel in vivo

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Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

The fixation and incorporation of ruptured rotator cuff tendon to bone is a major concern in rotator cuff repair surgery. Rotator cuff repair usually fails at the tendon–bone interface, especially in case of large or massive tears. To enhance tendon–bone healing, an injectable hydrogel made with periosteal progenitor cells(PPCs) and poly (ethylene glycol) diacrylate (PEGDA) tethered with bone morphogenic protein-2(BMP-2) was developed to encourage extracellular matrix synthesis for tendon-to-bone healing in rotator cuff repair.

Methods

The infraspinatus tendon was cut from the greater tuberosity and repaired through a transosseous tunnel with the injectable progenitor cell-BMP-2 hydrogel applied between the tendon–bone interface. The injectable hydrogel was prepared from 10% poly (ethylene glycol) diacrylate (PEGDA) containing 0.05% of the photoinitiator. BMP-2 tethered with poly(ethylene glycol) (PEG) was blended to the hydrogel. Rabbit periosteal progenitor cells (PPCs) isolated from periosteum were mixed with hydrogel and injected on the tendon–bone interface. Ultraviolet radiation (365 nm) was applied for 60 s to photopolymerize the injection and solidify the hydrogel. The rabbits were killed at 4 and 8 weeks. The morphological characteristics of the healing tendon-to-bone interface were evaluated by histological and immunohistochemical methods. The biomechanical test was done to determine healing attachment strength.

Results

At both the 4- and 8-week killing, histological analysis of the tendon–bone interface showed an increasing fibrocartilage and bone layer formed in the tendon–bone interface in PEGDA group. At 4 weeks, fibrocartilage-like tissue was observed in a focal area. At 8 weeks, further matrix deposition occurred with fibrocartilage formation in the tendon–bone junction, and bone formation appeared near host bone. Immunohistochemistry revealed the presence of aggrecan and type II collagen. Biomechanical testing revealed a higher maximum pull-out load at all time points with a statistically significant difference at 4 and 8 weeks postoperatively.

Conclusion

PEGDA hydrogel was approved as an adequate matrix for the encapsulation of cells and signal factor, and as an effective local delivery method to the tendon–bone interface through injection and photopolymerization. The PPCs-BMP2-hydrogel provides a powerful inductive ability between the tendon and the bone and enhances tendon–bone healing through the neoformation of fibrocartilage.

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Acknowledgments

The authors would like to thank Chang Gung Memorial Hospital Grant (CMRPG-250191; CMRPG-270291) for financially supporting this research. The staff of the Medical Research Center and Laboratory Animal Center of Chang Gung Memorial Hospital at Keelung, are appreciated for their technical assistance with histological section, immunohistochemistry assay, and biomechanical testing.

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Correspondence to Chih-Hwa Chen.

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S. W. Whu had equal contribution as the first author.

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Chen, CH., Chang, CH., Wang, KC. et al. Enhancement of rotator cuff tendon–bone healing with injectable periosteum progenitor cells-BMP-2 hydrogel in vivo. Knee Surg Sports Traumatol Arthrosc 19, 1597–1607 (2011). https://doi.org/10.1007/s00167-010-1373-0

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  • DOI: https://doi.org/10.1007/s00167-010-1373-0

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