| 单词 | provisional callus |
| 释义 | > as lemmasprovisional callus provisional callus n. [after French cal provisoire (1822 or earlier)] Medicine the ring of callus originally formed at the site of a bone fracture. ΚΠ 1829 R. D. Grainger Elem. Gen. Anat. 417 Baron Dupuytren concludes from his investigations that there are two distinct processes in the union of fracture, or rather that a double callus is formed. The first, which he calls provisional callus, ‘cal provisoire’ is formed by a deposition either in the periosteum alone, or in that membrane and in the cellular, and even in the muscular tissues. 1830 Lancet 22 May 263/2 The temporary union, the provisional callus, which holds the ends of the bone together, is not fully ossified before the fortieth, fiftieth, or sixtieth day. 1856 R. Druitt Surgeon's Vade Mecum (ed. 7) 217 The formation of what is called a provisional callus, that is to say, a ferrule of new bone encircling both fragments. 1908 Philos. Trans. (Royal Soc.) B. 199 259 When a fracture takes place without rupture of the periosteum, the union of bone occurs so perfectly that it is difficult after a time to discern the seat of fracture, and at no time is there much if any provisional callus. 1996 Biomaterials 17 1494/2 The provisional callus develops from the very soft and easily disrupted haematoma, and as the definitive callus is formed, it becomes increasingly more mineralized and gains in strength. < as lemmas |
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