目的 了解新战士长骨生长板闭合程度与MRI表现。方法 采用Tanner二次骨化中心闭合分级标准, 对武警某部新兵连230名战士胫骨近段X线照片进行胫骨近端生长板闭合情形观察与分析, 对照和归纳胫骨近端干骺端生长板MRI表现。结果 230名新兵胫骨近端X线照片显示干骺端生长板Tanner分级中未完全闭合生长板(即1～3级)129例(56.09%, 129/230), 4级即生长完全闭合101例(43.91%, 101/230);对胫骨近端干骺端生长板闭合程度MRI评价, MRI判断完全闭合生长板67例(29.13%, 67/230);生长板含有A、B、C、D信号三种以上, 或只要含有C、D信号中的任何一种和(或)两种, MRI判断未完全闭合生长板163例(70.87%, 163/230), 则X线片Tanner分级与MRI评价完全与未完全闭合闭合生长板两者有一定的差异(χ²=37.24, P=0.046, P＜0.05);如MRI参照Tanner分级骨化生长板覆盖干骺端小于或大于1/2标准, 则Tanner分级X线2～3级120名, MRI判断级别显著低于X线分级(χ²=17.21, P=0.0018, P＜0.01)。结论 新战士胫骨近端干骺端生长板闭合程度不同, MRI能较好地显示正常生长板闭合程度、形态及其信号特征。

Objective To study MRI manifestations of long bone growth plate in recruits. Methods Imaging characteristics were studied through 230 male soldiers before the military exercise. Using X-ray imaging of growth plate of the proximal tibia of recruits before training and Tanner’s staging criteria of the growth plate cartilage of the secondary ossification center, the closure degree of growth plate of the proximal tibia was observed and analyzed. Imaging of X-rays and MRI on the closure degree of the epiphyseal line was concluded and compared. Results According to Tanner’s staging criteria of the closure degree displayed on X-ray picture in 230 recruits of growth plate of the proximal tibia, incomplete closed in 129 cases(56.09%), complete closed in 101 cases(43.91%). MRI images showed that incomplete closed in 163 cases(70.87%), complete closed in 67 cases(29.13%); the difference between the two were significant by comparing with the closure degree of growth plate of the proximal tibia(χ²=37.24, P=0.046). The morphologic appearances of long bone growth plate were also different. MRI signal intensity of the growth plate can be divided into four categories:(A)signal similar to the cortical bone; (B) signal similar to cancellous bone; (C) signal similar to the gastrocnemius muscle; (D) signal similar to articular cartilage. Containing A and(or) B signal was defined as complete closed growth plate, the others were incomplete closed ones. Referring to Tanner’s staging criteria, cartilage of growth plate overlies over or less than one half on the metaphyseal region. The number of the second degree and third degree in X-ray manifestations added to 120 cases, which far surpass that in MRI(χ²=17.21, P=0.0018). Conclusions The proximal tibial stem epiphyseal growth plate closure degrees in recruits are different. MRI has high spatial resolution and high SNR so that it can clearly reveal the growth plate, can display closing degree of normal growth plate of the proximal tibia , morphologic and signal characteristics.