胫骨结节骨软骨病好发年龄是（）
A.6～9岁
B.10～11岁
C.12～14岁
D.15～17岁
E.18～20岁
参考答案：C
解析：胫骨结节是髌韧带的附着点，属于牵拉骨骺，18岁前胫骨结节易受损而产生骨骺炎、甚至缺血、坏死。胫骨结节骨软骨病好发于12～14岁好动的男孩，多为单侧性。常有近期参加剧烈运动史。临床上以胫骨结节处逐渐出现疼痛，肿块为特点，疼痛与活动有明显关系。检查可见胫骨结节明显隆起，皮肤无炎征。局部质硬、压痛较重。作伸膝抗阻力动作时疼痛加剧。X线片显示胫骨结节骨骺增大、致密或破裂，周围软组织肿胀等。
BEIJING—The sky is gray and air smells strange. It’s another day of smog. On Saturday, heavy haze（霾）still covered north and east China. Highways were closed and couldn’t take off on time. The smoggy weather the country’s land from north to south, including Beijing, Hebei, Shandong, and 6 other provinces. People could only see clearly than 50 meters in some areas. Cities Shanghai and Nanjing have been covered by the gray sky for the past several days. Many walkers in the street had to wear . In the Lukou airport in Nanjing, more than 60 flights were canceled(取消) on Saturday the haze, which also made primary and middle schools and kindergartens stop on Thursday and Friday in Nanjing. The office worker of Environmental Protection said earlier this week that there were several reasons behind the widespread haze: unpleasant weather conditions making difficult for smog to disappear, motor vehicle exhaust（尾气）, and coal use for winter heating. To fight pollution, the Chinese government now plans to clean up the air by cutting coal use, some factories, and removing 6 million old cars from the roads. “We must face up to the facts,” said Yan Naiqiang, a professor of environmental science at Shanghai Jiao Tong University. “The treatment of smog will be a long fight. From now on, if we use buses or cars less and do more riding, we believe a clear sky is not a faraway dream.”
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