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目的 分析早期股骨头缺血坏死 (ANFH)的 MR表现 ,为早期诊断及有效处理提供可靠的影像学依据。方法 回顾性分析 32例 ANFH患者 (4 2个髋关节 )的 MR资料。结果 T1W 42个股骨头表现为前上区软骨下局灶性均匀或不均匀、边界清晰的呈楔形、节段形、带状或环状 T1W 低信号 38号 ,等信号 2例 ,混杂信号 2例 ;T2 W 高信号 32例 ,低信号 1例 ,等信号 7例 ,混杂信号 2例。 STIR序列上均为高信号 ,且范围大于 T2 W 。关节腔积液 17例 (4 0 .5 % ) ,“裂隙征”2 5例 (5 9.5 % )。结论 1广泛均匀的水肿是 ANFH极早期表现。 T1W1呈楔形、节段型、带状或环状低信号为ANFH最常见 MRI表现。 2“裂隙征”是 ANFH的一个重要 MRI征象。 3关节腔积液在 ANFH的诊断和鉴别诊断上有重要意义。 4早期所见极易与一过性骨质疏松症混淆 ,随访观察对鉴别有重要价值。
Objective To analyze the MR findings of early avascular necrosis of the femoral head (ANFH) and provide a reliable imaging basis for early diagnosis and effective treatment. Methods The MR data of 32 patients with ANFH (42 hips) were retrospectively analyzed. Results Twenty-two femoral heads of T1W were characterized by uniform or non-uniform focal subchondral area, clear wedge-shaped, segmental, band-shaped or annular T1W low signal of 38, equal signal of 2 and mixed signal of 2 32 W high signal, 1 low signal, 7 equal signal and 2 mixed signals. STIR sequences are high signals and range over T2W. There were 17 cases (40.5%) of joint effusion and 25 cases (5 9.5%) of “fracture sign”. Conclusions 1 A wide range of edema is a very early manifestation of ANFH. T1W1 was wedge-shaped, segmental, ribbon or ring-shaped low signal for the most common MRI ANFH performance. 2 “Fissure sign” is an important MRI sign of ANFH. 3 joint effusion in the diagnosis of ANFH and differential diagnosis of great significance. 4 early see easily confused with transient osteoporosis, follow-up observation of the identification of important value.