Abstract: The present invention relates to a medical staple having the compressive and expandable leg member which is used for the orthopedic surgery, the surgery of an calcaneus, talus fracture in order to repair broken bones in a safe and effective way, more particularly it is directed to devise a new type of medical staple for the bone setting which is capable of adjusting the distance between staple's leg member so as to effectively control the compressional strength onto the contacting portion of broken bones depending on the clinical diagnosis after the surgery of bone setting.