The application of medical imaging in the physiological characterization of athletes covers multiple aspects such as injury diagnosis and monitoring, physiological structure assessment, preventive examination, and body change monitoring, which is of great significance in safeguarding athletes' health and improving their competitive performance. Field hockey is a high-intensity sport with intense confrontation, and the high incidence of knee injuries is a characteristic of athletic injuries in field hockey players. Early detection and treatment of articular cartilage injuries are of great significance to the performance of athletes' level of play and the extension of athletic injurie life. T2 mapping is a widely used cartilage MR imaging technique with high sensitivity to cartilage biochemical changes. In this paper, the T2 mapping technique was used to image the kneecap cartilage of field hockey athletes and healthy youths, to investigate the effect of field hockey on athletic injurie and the physiological characteristics of kneecap cartilage injury and to predict the development of the injury.