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.