Schanz Screw is intended for use with an external fixation system for fracture fixation, available in hydroxyapatite coated and uncoated.Hydroxyapatite has always been a cutting-edge material in orthopedic surgery, mainly because hydroxyapatite is highly similar to human bone tissue and can be absorbed by human tissue, so in fracture healing and bone defect repair, hydroxyapatite can be used as implants or bone filling materials.