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当前学科：骨外科学
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一男孩，10岁，左膝部疼痛跛行2年，有夜间痛。检查：左膝活动良好，左髋不能伸直，大腿肌肉萎缩，血沉28mm/h，X线片示髋关节骨质疏松，诊断应为（）。
A . 髋关节类风湿性滑膜炎
B . 髋关节结核性滑膜炎
C . 髋关节一过性滑膜炎
D . 髋关节风湿性滑膜炎
E . 膝关节滑膜结核
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