目的 探讨磁共振成像（MRI）技术在膝关节隐匿性骨折临床诊断中的应用价值。方法 从我院2020年7月—2022年7月期间接诊的膝关节隐匿性骨折病例中随机抽取78例作为研究对象,所有病例均开展MRI、CT检查,分析并比较MRI和CT检查对该病变的检出率。结果 在78例膝关节隐匿性骨折病例中,MRI检查确诊76例,检出率97.44%,CT检查确诊61例,检出率78.21%,MRI检查对该疾病的检出率相比CT检查更高,差异有统计学意义（P<0.05）。MRI对半月板损伤、关节腔少量积液、韧带损伤、骨折塌陷及水平错位检出率相比CT更高,差异有统计学意义（P<0.05）,两种检查方式在严重骨折检出率差异较小,差异无统计学意义（P>0.05）。结论 在膝关节隐匿性骨折的临床诊断中应用MRI对疾病检出率较高,且操作简便,在临床中具有较高的推广价值。

Objective To investigate the application value of magnetic resonance imaging(MRI)in the clinical diagnosis of occult knee fractures. Methods A total of 78 cases of occult knee fracture received by our hospital from July 2020 to July 2022 were randomly selected as research subjects,and MRI and CT examinations were performed on all cases,and the detection rates of MRI and CT examination were analyzed and compared. Results Among the 78 cases of occult knee fracture,76 cases were confirmed by MRI examination,with a detection rate of 97. 44%,and 61 cases by CT examination,with a detection rate of 78. 21%,and the detection rate of MRI examination for this disease was higher than that of CT examination,and the difference was statistically significant(P<0. 05). MRI had higher detection rate of meniscal injury,small effusion in the joint cavity,ligament injury,fracture collapse and horizontal misalignment than CT(P<0. 05),and the difference in the detection rate of severe fractures was small and not statistically significant(P>0. 05). Conclusions The application of MRI in the clinical diagnosis of occult knee fracture has a high disease detection rate and simple operation,and has high promotion value in clinical practice.

       目的   探讨眼底豹纹斑密度（FTD）及视盘旁萎缩弧（PPA）与眼轴长（AL）的相关性，为眼底定量化在儿童近视防控的应用提供科学依据。方法   本研究随机抽取广州市荔湾区两所小学三年级学生作为研究对象，在校园视力筛查的过程中同时采集AL、CR和眼底彩照。使用AI软件对眼底彩照进行量化分析，量化指标包括不同区域和范围的FTD及PPA面积大小，根据眼轴长度分为三组：A组（AL＜23 mm）；B组（23 mm≤AL＜24 mm）；C组（24 mm≤AL）。结果   共有398例右眼被纳入统计分析，年龄范围8~11岁，中位数是9岁，男性人数占55.1％。三组组间AL、AL/CR和SE比较均有统计学差异（P＜0.05）。A组与B组相比，FTD在后极部整体范围、黄斑中心3 mm区域、黄斑中心3 mm区域上方区域具有统计学差异（P＜0.05），C组与B组相比，PPA面积及FTD在后极部整体范围、视盘为中心4.5 mm范围、黄斑为中心直径3 mm和6 mm范围均具有统计学差异（P＜0.05），Spearman相关性分析表明，AL与PPA（r=0.443）和FTD（r=0.322）呈正相关（P＜0.001）。亚组相关性分析表明，A组仅黄斑为中心直径3 mm上方范围FTD与AL呈正相关（P=0.028），B组PPA、黄斑中心直径3 mm及其上方范围FTD与AL呈正相关（P＜0.05），C组仅PPA与AL呈正相关（P=0.005）。结论 眼底定量对于儿童近视防控具有潜在价值，PPA和FTD与AL呈正相关性，不同区域和范围FTD与AL相关性具有一定差异性，黄斑中心直径3 mm范围及其上方范围与眼轴相关性最强。FTD在短眼轴阶段就可以作为生物标记物预测近视严重程度，而PPA主要在长眼轴阶段体现生物标记物的作用。

       Objective  To investigate the correlation between fundus tessellated density（FTD）and peripapillary atrophy（PPA）with axial length（AL）, providing a scientific basis for the application of fundus quantification in the prevention and control of myopia in children. Methods  This study randomly selected third-grade students from two primary schools in Liwan District, Guangzhou City, as research subjects. Axial length（AL）, corneal radius（CR）, and fundus color photographs were collected simultaneously during the school vision screening process. AI software was utilized to perform quantitative analysis on the fundus color photographs, with quantification indicators including the area size of PPA and FTD in different regions and ranges. Subjects were divided into three groups based on axial length：Group A（AL＜23 mm）; Group B（23 mm≤AL＜24 mm）; Group C（AL≥24 mm）. Results  A total of 398 right eyes were included in the statistical analysis, with an age range of 8 to 11, a median age of 9, and 55.1% were male. There were significant statistical differences in AL, AL/CR, and spherical equivalent（SE）among the three groups（P＜0.05）. Compared with Group B, Group A showed significant statistical differences in FTD in the overall posterior pole, the 3 mm diameter area centered on the fovea, and the superior area of the 3 mm foveal center（P＜0.05）. Compared with Group B, Group C showed significant differences in PPA area and FTD in the overall posterior pole, the 4.5 mm diameter area centered on the optic disc, and the 3 mm and 6 mm diameter areas centered on the fovea（P＜0.05）. Spearman correlation analysis indicated that AL was significantly positively correlated with PPA（r=0.443）and FTD（r=0.322）（P＜0.001）. Subgroup correlation analysis showed that in Group A, only the FTD in the superior area of the 3 mm diameter centered on the fovea was significantly positively correlated with AL（P=0.028）. In Group B, PPA and FTD in the 3 mm diameter and superior area centered on the fovea were significantly positively correlated with AL（P＜0.05）. In Group C, only PPA was significantly positively correlated with AL（P=0.005）. Conclusions  Fundus quantification holds potential value for the prevention and control of myopia in children. PPA and FTD show significant positive correlations with AL, with varying degrees of correlation in different regions and ranges of FTD with AL. The 3 mm diameter area centered on the fovea and its superior area have the strongest correlation with the eye axis. FTD can serve as a biomarker to predict the severity of myopia in the early stages of eye axis elongation, while PPA primarily manifests as a biomarker in the later stages of elongation.