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Intra-Articular Mesenchymal Stem Cell Exosomes And Hyaluronic Acid Combination Therapy Promotes Safe And Functional Osteochondral Repair In A Porcine Model

Keng Lin Francis Wong, MMed(Orth), MCI (NUS), FRCSEd (Orth), FAMS, PhD
SINGAPORE

Intra-Articular Mesenchymal Stem Cell Exosomes And Hyaluronic Acid Combination Therapy Promotes Safe And Functional Osteochondral Repair In A Porcine Model

Keng Lin Francis Wong, MMed(Orth), MCI (NUS), FRCSEd (Orth), FAMS, PhD, SINGAPORE Shipin Zhang, PhD, SINGAPORE Xiafei Ren, PhD, SINGAPORE Ruenn Chai Lai, PhD, SINGAPORE Sai Kiang Lim, PhD, SINGAPORE James Hui, MBBS, FRCS, FAMS, M.D. (Orthopaedic Surgery), SINGAPORE Wei Seong Toh, PhD, SINGAPORE

Department of Orthopaedic Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore, Singapore, SINGAPORE

2021 Congress Abstract Presentation 6 minutes rating (1)

Anatomic Location

Knee

Anatomic Structure

Cartilage

Diagnosis / Condition

Osteoarthritis

Treatment / Technique

Biologics Stem Cell Therapy

Diagnosis Method

MRI

Sports Medicine

Basic Science

Cartilage

Cartilage Injuries

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Summary: Mesenchymal stem cell exosomes and hyaluronic acid combination administered at a clinically acceptable frequency of three intra-articular injections promote osteochondral repair with significantly improved morphological, histological, and biomechanical outcomes in a clinically relevant porcine model.

Purpose

We had previously reported the efficacy of human mesenchymal stem cell (MSC) exosomes in repair of critical-size osteochondral defects in rats and rabbits. To enable clinical translation of MSC exosomes, we proposed a validation of the efficacy of MSC exosomes in a large animal model.

Materials & Methods: Bilateral osteochondral defects (6mm diameter and 1mm depth) were surgically created on the medial femoral condyles of 24 knees in 12 micropigs. Immediately after surgery and at days 8 and 15 post-surgery, 6 micropigs in exosome/HA group received sequential administration of 1mg exosomes in 1ml phosphate-buffered saline (PBS) followed by 1ml hyaluronic acid (HA; Synvisc®) in both knees, whereas the other 6 micropigs in the HA group received 1ml of PBS followed by 1ml HA in both knees. Except for MRI performed on day 15, 2 and 4 months, macroscopic, histological, biomechanical, and micro-CT assessments were performed at 4 months.

Results

At 4 months, exosome/HA-treated defects had significantly higher MRI scores than that for HA-treated defects at day 15 (4.46 vs 3.63; P=0.017), 2 months (7.83 vs 5.79; P=0.023) and 4 months (9.25 vs 6.71; P=0.024). Exosome/HA-treated defects also had significantly better ICRS macroscopic score (9.22 vs 7.25; P=0.008) and ICRS II histological score (79.71 vs 65.10; P=0.032) than HA-treated defects. The mean Young’s moduli of exosome/HA-treated defects were higher than that of HA-treated defects in the defect periphery (19.92 vs 5.50MPa; P=0.003) but modestly in the defect centre (15.17 vs 3.53MPa; P=0.119). Micro-CT analysis revealed structural improvements in the subchondral bone with significantly higher BV/TV and Tb.Th in exosome/HA-treated defects than in HA-treated defects. Importantly, no adverse responses or systemic alterations were observed.

Conclusion

MSC exosomes and HA combination administered at a clinically acceptable frequency of three intra-articular injections promote osteochondral repair with significantly improved morphological, histological, and biomechanical outcomes in a clinically relevant porcine model.

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Intra-Articular Mesenchymal Stem Cell Exosomes And Hyaluronic Acid Combination Therapy Promotes Safe And Functional Osteochondral Repair In A Porcine Model

Intra-Articular Mesenchymal Stem Cell Exosomes And Hyaluronic Acid Combination Therapy Promotes Safe And Functional Osteochondral Repair In A Porcine Model

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Intra-Articular Mesenchymal Stem Cell Exosomes And Hyaluronic Acid Combination Therapy Promotes Safe And Functional Osteochondral Repair In A Porcine Model

Intra-Articular Mesenchymal Stem Cell Exosomes And Hyaluronic Acid Combination Therapy Promotes Safe And Functional Osteochondral Repair In A Porcine Model

Purpose

Results

Conclusion