骨痂是什么 骨痂形成時間

骨(gu)痂是形成于骨(gu)修復處的(de)復合組(zu)(zu)織(zhi)。它在骨(gu)折后可呈現持續性和漸進性的(de)組(zu)(zu)織(zhi)類型轉變，血腫-肉芽組(zu)(zu)織(zhi)-鈣化組(zu)(zu)織(zhi)-編(bian)制新生骨(gu)-，直到(dao)恢(hui)復其原有的(de)剛度(du)。骨(gu)痂形成是活(huo)骨(gu)刺激的(de)反應，包括(kuo)化學性、感染性、力(li)學不穩(wen)定等的(de)反應，骨(gu)痂是固(gu)定不穩(wen)定的(de)征象。

骨(gu)(gu)(gu)(gu)(gu)(gu)折愈合(he)過程(cheng)中的原(yuan)始骨(gu)(gu)(gu)(gu)(gu)(gu)痂(jia)(jia)形成(cheng)(cheng)期，在骨(gu)(gu)(gu)(gu)(gu)(gu)折端(duan)內(nei)、外(wai)形成(cheng)(cheng)骨(gu)(gu)(gu)(gu)(gu)(gu)組織(zhi)逐(zhu)漸(jian)(jian)骨(gu)(gu)(gu)(gu)(gu)(gu)化(hua)，形成(cheng)(cheng)新骨(gu)(gu)(gu)(gu)(gu)(gu)，稱(cheng)為膜內(nei)化(hua)骨(gu)(gu)(gu)(gu)(gu)(gu)。外(wai)面逐(zhu)漸(jian)(jian)向骨(gu)(gu)(gu)(gu)(gu)(gu)折端(duan)生長，彼此會合(he)形成(cheng)(cheng)梭形，稱(cheng)為內(nei)骨(gu)(gu)(gu)(gu)(gu)(gu)痂(jia)(jia)和外(wai)骨(gu)(gu)(gu)(gu)(gu)(gu)痂(jia)(jia)。骨(gu)(gu)(gu)(gu)(gu)(gu)折斷端(duan)及髓腔(qiang)內(nei)的纖維(wei)組織(zhi)亦逐(zhu)漸(jian)(jian)轉(zhuan)化(hua)為軟(ruan)骨(gu)(gu)(gu)(gu)(gu)(gu)組織(zhi)，并隨軟(ruan)骨(gu)(gu)(gu)(gu)(gu)(gu)細胞的增生、鈣(gai)化(hua)而(er)骨(gu)(gu)(gu)(gu)(gu)(gu)化(hua)，稱(cheng)為軟(ruan)骨(gu)(gu)(gu)(gu)(gu)(gu)內(nei)化(hua)骨(gu)(gu)(gu)(gu)(gu)(gu)，而(er)在骨(gu)(gu)(gu)(gu)(gu)(gu)折處(chu)形成(cheng)(cheng)環狀骨(gu)(gu)(gu)(gu)(gu)(gu)痂(jia)(jia)和髓腔(qiang)內(nei)骨(gu)(gu)(gu)(gu)(gu)(gu)痂(jia)(jia)。兩部(bu)分骨(gu)(gu)(gu)(gu)(gu)(gu)痂(jia)(jia)會合(he)后，這些原(yuan)始骨(gu)(gu)(gu)(gu)(gu)(gu)痂(jia)(jia)不(bu)斷鈣(gai)化(hua)而(er)逐(zhu)漸(jian)(jian)加強，當(dang)其達到(dao)足以抵(di)抗肌收縮及成(cheng)(cheng)角、剪力和旋轉(zhuan)力時，則骨(gu)(gu)(gu)(gu)(gu)(gu)折已達到(dao)臨床愈合(he)，一般(ban)約需 4 - 8 周。