The Role of Type H Vessel Formation in Induced Membrane of Patients With Critical Size Bone Defect

The goal of this clinical trial is to test the role of type H vessel and investigate the mechanism of its regulation in induced membrane created by induced membrane technique in patients with open fracture, aged between 20 and 80. The main questions to answer are: * Whether type H vessel will be critical for induced membrane-mediated bone healing? * Whether type H vessel will be a biomarker for diagnosing bone healing in patients with open fracture? * To find out a circulating indicator for type H vessel in patients with open fracture undergoing induced membrane technique. Participants will be enrolled to collect tissues of induced membrane and blood samples to detect type H vessel and measure the biomarkers of type H vessel, investigating their correlation with the capacity of bone healing. To avoid selection bias of treatment, the grouping will be achieved by a randomized protocol qualified clinical trial center of Chang Gung Memorial Hospital to divide into with induced membrane and without induced membrane. Researchers will compare these two groups to test our hypothesis that type H vessel in important in induced membrane and their corresponding biomarkers.