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| MRI Study of Ischiofemoral Space after Femoral Head Collapse |
| XING Qianchao, WANG Shenglin, QIU Hengzhi, et al |
| Affiliated Hospital of Chengde Medical College, Hebei Chengde 067000, China |
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Abstract Objective: To explore the changes of ischiofemoral space (IFS) and the relationship between ischiofemoral space with the quadratus femoris space(QFS), femoral offset (FO) and cervicodiaphyseal angle(CCD)after the collapse of the femoral head. Methods: The hip MRI images of 55 patients with unilateral femoral head necrosis (stage Ⅲ 31 cases,stage Ⅳ 24 cases ) were retrospectively analyzed.The bilateral IFS and QFS were measured on the cross section of T1WI,the bilateral FO and CCD were measured on the coronal section of T1WI,and observed the morphological and signal changes of the quadratus femoris muscle on the cross section of PDWI-FS. Result: s The IFS (1.76±0.14cm) , QFS(0.94±0.23cm), FO(2.78±0.27cm)in affected side were significantly lower than that in healthy side(2.19±0.19cm),(1.71±0.21cm), (3.83±0.22cm), the CCD(134.74±5.48°)in affected side significantly higher than that in healthy side (130.83±5.14°), the differences between the two groups were statistically significant (P＜0.05). The QFS, FO have positive correlation with IFS in the affected side(r＝0.757, 0.839, P＜0.05), while CCD have significant negative correlation with IFS in the affected side (r＝-0.680, P＜0.05). The IFS(1.81±0.20cm)、 QFS(0.99±0.26cm) and FO(2.84±0.27cm) in affected side of stage III patients were significantly higher than those of stage IV patients [IFS(1.71±0.14 cm), QFS (0.87±0.15 cm) and FO (2.69±0.26 cm)], while the CCD (133.17±5.10°) was lower than that of stage IV patients (136.77±5.38°), and there were significant differences between the two groups (P＜0.05). Conclusion: The IFS, QFS and FO decrease, while CCD increase after the collapse of the femoral head.The ischial femur impingement caused by the collapse of the femoral head may be involved in the occurrence of hip pain in patients with femoral head necrosis.
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2019, Vol. 25 
