Bone mineral density changes in distracted callus stimulated by pulsed direct electrical current

Area of Science:

• Orthopedics
• Biomedical Engineering
• Regenerative Medicine

Background:

• Bone lengthening procedures often result in poorly mineralized callus tissue.
• External fixators are commonly used for bone lengthening, but healing can be prolonged.
• Optimizing callus formation and mineralization is crucial for successful bone regeneration.

Purpose of the Study:

• To investigate the efficacy of pulsed direct current (DC) electrical stimulation on callus formation and mineralization during bone lengthening.
• To determine if electrical stimulation can improve bone mineral density in distracted callus.
• To assess the potential of pulsed DC stimulation to accelerate the bone healing process in a rabbit tibia model.

Main Methods:

• A 1-cm bone lengthening model was created using an external fixator on rabbit tibias.
• Pulsed direct current (20 microamperes) was applied for 12 hours daily from osteotomy until 40 days post-lengthening.
• Dual-energy X-ray absorptiometry (DXA) was used to evaluate the area, bone mineral content, and bone mineral density of the callus and tibia segments.

Main Results:

• Electrically stimulated callus demonstrated significantly increased absolute and relative bone mineral density compared to the control group.
• DXA analysis confirmed enhanced mineralization in the distracted callus of the stimulated group.
• No significant differences were noted in the proximal and distal tibia segments, indicating localized effects on the callus.

Conclusions:

• Pulsed direct current electrical stimulation is effective in enhancing callus mineralization during bone lengthening.
• This stimulation technique shows promise for improving outcomes in bone lengthening procedures by promoting better callus quality.
• Pulsed DC stimulation may offer a method to shorten the overall treatment duration for leg lengthening.