Muscle-bone interactions during fracture healing.

Area of Science:

• Biomedical Engineering
• Orthopedics
• Regenerative Medicine

Background:

• Fracture healing is influenced by surrounding soft tissues, with muscle traditionally viewed primarily for vascular support.
• Emerging research reveals significant cellular and paracrine roles of muscle in bone repair.
• Understanding muscle-bone interactions is crucial for advancing fracture treatment.

Purpose of the Study:

• To review the current understanding of muscle's contribution to fracture healing.
• To highlight the cellular and paracrine mechanisms involved in muscle-bone interactions.
• To present models used for studying these interactions.

Main Methods:

• Literature review of existing research on muscle and fracture healing.
• Analysis of studies investigating cellular contributions from muscle to bone.
• Examination of research on muscle-derived factors (secretome) impacting osteogenesis and myogenesis.

Main Results:

• Muscle can supply osteoprogenitor cells, particularly when periosteal contribution is compromised.
• Osteoprogenitor cells from muscle exhibit comparable osteogenic potential to periosteal cells.
• Muscle secretome contains factors that modulate both bone formation (osteogenesis) and muscle regeneration (myogenesis).

Conclusions:

• Muscle is an active participant in fracture healing, providing cellular precursors and bioactive factors.
• The cellular and paracrine functions of muscle offer novel therapeutic strategies for traumatic musculoskeletal injuries.
• Further research into muscle-bone interactions can optimize treatments for complex fractures.