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目的:分析半程马拉松运动后业余运动员髌腱形态特征动态变化的MRI表现。方法:招募19名男性业余马拉松运动员共38侧髌腱，年龄26~53（41.5±7.9）岁，跑龄3~18年，周跑量30~90 km，月跑量100~300 km，分别于半程马拉松跑前（基线，tn 0）、跑后3 h内（tn 1）、跑后3 d（tn 2）对髌腱进行1.5 T MRI扫描。招募从未参加过马拉松、每周运动（包括但不限于跑步）时长0.05）。n 结论:男性业余马拉松运动员髌腱的近端CSA增大。一次半程马拉松后髌腱长度、区域性CSA及体积产生的变化是可逆的。“,”Objective:To explore the dynamic changes of morphological characteristics of patellar tendon (PT) in amateur athletes after a half-marathon using magnetic resonance imaging.Methods:A total of 19 male amateur marathon runners with 38 knee joints,aged from 26 to 53(41.5±7.9) years, running for 3 to 18 years, with a weekly running volume of 30-90 km and a monthly running volume of 100-300 km were enrolled and underwent 1.5T MRI scan before the half-marathon, within 3 hours after running and 3 days after running. Ten healthy male volunteers with 20 knee joints, who had never participated in marathon and exercised (including but not limited to running) per week for less than 150 minutes were recruited as the control group, aged from 26 to 54 (39.4±9.1) years. Firstly, the PT signal was qualitatively assessed on fat-suppressed proton density-weighted imaging (fs-PDWI) sequence to observe the presence of patellar tendinitis. Then, the length, proximal, middle and distal cross-sectional area (CSA), and volume of PT were measured using the post-processing tool ITK-SNAP, and the data were standardized. The independent sample n t-test was used for comparing. One-way repeated measures analysis of variance was used to analyze the morphological changes of PT before and after half-marathon running.n Results:The incidence of asymptomatic patellar tendinitis in amateur marathon runners was 26.3% (5/19). No significant MR signal changes of PT were observed in all runners after running. The proximal CSA in runners group was larger than that in controls [(4.20±0.62) mmn 2/kgn 3/4 vs (3.63±0.57) mmn 2/kgn 3/4, n P0.05). The length, proximal and distal CSA and volume of PT in runners group increased at 3 h after running [(47.35±3.22) mm vs (46.83±3.35) mm; (102.52±13.03) mmn 2 vs (98.98±13.14) mmn 2; (108.67±15.72) mmn 2 vs (100.27±14.37) mmn 2; (4 020.36±514.38) mmn 3 vs (3 826.57±499.23) mmn 3, all n P0.05). The middle CSA were not significantly different among different periods(alln P>0.05).n Conclusion:Marathon has effect on the normal PT morphology in male amateur marathon runners, showing an increase in proximal CSA. A half-marathon will cause reversible changes in PT length, regional CSA and volume.