Effect of different shapes of recipient site creation micro-blades at varying angles and wound injury.

BACKGROUND

Wound injury is a critical issue in hair restoration. The shape and size of blades cause varying degree of tissue trauma.

AIMS

To check (mathematically) the tissue trauma (injury) caused by different shapes of the blades at varying angles.

PATIENTS/METHODS: The trigonometric theories were applied to each shape and angles to calculate the surface area (correlating with the tissue injury). These shapes included rectangular blade, 30°-angled blades, 60°-angled blade, 30°-sapphire blade, and 60°-sapphire blade. The surface areas were calculated at 90°, 45°, 30°, and 15° insertion angles.

RESULTS

The 30°-sapphire blade caused the least injury followed by 30°-angled blade. The rectangular blade had the largest surface area and hence will produce the maximum amount of tissue injury. The blade at 90° produced maximum injury whereas the blade entering at 15°, produced lowest amount of tissue injury. The blade in sagittal direction caused less injury as compared to the blade in coronal direction.

CONCLUSION

The 30°-sapphire blade caused the least tissue injury whereas the rectangular blade caused maximum injury. The amount of tissue injury decreases as the angle of insertion decreases and vice versa.