with optimum preservation of periosseous tissues , bone marrow , and blood supply at the time of osteotomy , stability of external fixation , and 1.0 mm per day of distraction in four steps , osteogenesis within the distraction gap of an elongating bone takes place by the formation of a physislike structure , in which new bone forms in parallel columns extending in both directions from a central growth zone .
C0029468
osteotomy
C0262950
bone