Yamamoto Takuaki, Iwamoto Yukihide
Department of Orthopaedic Surgery, Kyushu University.
Clin Calcium. 2011 Jul;21(7):993-1001.
A subchondral insufficiency fracture of the femoral head (SIF) is a recently proposed concept, which has generally been observed in elderly women with osteoporosis as well as in patients who have undergone a renal transplantation. In addition, this fracture is sometimes seen in young adults. Some cases of subchondral insufficiency fracture were managed by non-operative treatment, while others demonstrated disease progression until bone collapse which necessitated surgery. The low intensity band on the T1-weighted magnetic resonance images has been reported to be one of the characteristic imaging appearances in SIF, which corresponds histologically to the fracture line and associated fracture repair tissue. Therefore, the shape of the low intensity band generally tends to be irregular, disconnected, and convex to the articular surface. This finding has been considered to be useful for the differentiation with osteonecrosis.
股骨头软骨下不全骨折（SIF）是一个最近提出的概念，普遍见于患有骨质疏松症的老年女性以及接受过肾移植的患者。此外，这种骨折有时也见于年轻人。一些软骨下不全骨折病例采用非手术治疗，而其他病例则显示疾病进展直至骨塌陷，这就需要进行手术。据报道，T1加权磁共振图像上的低强度带是SIF的特征性影像学表现之一，在组织学上与骨折线及相关骨折修复组织相对应。因此，低强度带的形状通常倾向于不规则、不连续且向关节表面凸出。这一发现被认为有助于与骨坏死进行鉴别。
