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First Report of a Tissue-Engineered Graft for Proximal Humerus Gap Non-union After Chronic Pyogenic Osteomyelitis in
Vrisha Madhuri1,2, Sowmya Ramesh1,2, Harikrishna Varma3
1Paediatric Orthopaedics unit, Christian Medical College Hospital, Vellore, Tamil Nadu, India.
Insights
A novel bone graft using mesenchymal stem cells (MSCs) on a hydroxyapatite-tricalcium phosphate-tricalcium silicate composite (HASi) scaffold successfully repaired a large bone defect in a child. This approach shows promise for treating challenging bone injuries.
Area of Science:
- Regenerative Medicine
- Biomaterials Science
- Orthopedic Surgery
Background:
- Postseptic gap nonunion of long bones, particularly in pediatric cases, presents a significant clinical challenge with historically high failure rates.
- Effective bone defect reconstruction requires advanced strategies that promote osteogenesis and graft integration.
Observation:
- An 11-year-old patient with a 4 cm proximal humerus nonunion post-sepsis was treated with a custom HASi scaffold.
- The scaffold was loaded with autologous bone marrow-derived mesenchymal stem cells (MSCs) pre-differentiated towards an osteogenic lineage.
Findings:
- Complete bone union was achieved within 3 months post-treatment.
- At 3-year follow-up, the patient exhibited improved shoulder joint mobility.
- Radiographic and CT imaging confirmed successful graft incorporation and bone regeneration.
Implications:
- This case highlights the potential of osteogenically primed MSCs delivered via a HASi composite scaffold for treating critical-sized long bone defects.
- The findings suggest a viable, less invasive alternative for managing complex bone defects resulting from osteomyelitis.
- This regenerative approach offers a promising solution for improving functional outcomes in pediatric orthopedic reconstructions.
Case:
An 11-year-old child who presented with a postseptic gap nonunion of 4 cm in the proximal humerus was treated with a customized hydroxyapatite-tricalcium phosphate-tricalcium silicate composite (HASi) scaffold loaded with culture-expanded autologous bone marrow-derived mesenchymal stem cells (MSCs) primed into osteogenic lineage. Union occurred at 3 months, and at 3 years, the child had improved joint mobility, with radiographic and computed tomographic imaging evidence of incorporation of the graft.
Conclusions:
This case demonstrated the feasibility of MSC directed into osteogenic lineage on HASi to repair a long bone defect owing to postseptic osteomyelitis, a condition notorious for a high failure rate.
