the present invention provides an improved orthopedic system in which the part of a device that attaches to the bone is detachable from the rest of the device . the system includes a proximal bone anchor , associated proximal fastener , a distal bone anchor , and associated distal fastener . the bone anchors are affixed to the bone on opposing sides of the bone repair site , which may be an osteotomy . the fasteners serve to releasably mechanically couple the orthopedic device , which may be a distractor , to the bone anchors . in a preferred embodiment , the bone anchors are made from a resorbable material .