Use of physical forces in bone healing

Area of Science:

• Orthopedics and Regenerative Medicine
• Biomedical Engineering
• Skeletal Biology

Background:

• Nonunions and delayed unions represent significant challenges in orthopedic treatment.
• Recent advancements have introduced various physical modalities to enhance bone healing.
• Understanding the mechanisms of these modalities is crucial for effective clinical application.

Purpose of the Study:

• To review and summarize the efficacy of physical modalities for managing nonunions and delayed unions.
• To highlight the mechanisms by which these modalities stimulate bone formation.
• To provide an overview of recently approved treatments for bone healing.

Main Methods:

• Review of literature on physical modalities for bone healing.
• Analysis of clinical data on the effectiveness of direct current stimulation, pulsed electromagnetic fields, capacitive coupling, and low-intensity ultrasound.
• Examination of the cellular and molecular pathways involved in modality-induced bone formation.

Main Results:

• Implantable direct current stimulation is effective for extremity nonunions and spinal fusion.
• Pulsed electromagnetic fields show comparable efficacy to surgery for extremity nonunions.
• Capacitive coupling is effective for extremity nonunions and lumbar fusions.
• Low-intensity ultrasound aids in speeding fracture healing and managing delayed unions and nonunions.

Conclusions:

• Multiple physical modalities offer effective non-surgical and adjuvant treatment options for nonunions and delayed unions.
• These modalities converge on increasing intracellular calcium, ultimately promoting osteogenesis.
• Continued research into these physical therapies promises improved outcomes in orthopedic fracture management.