Objective To review the progresses in epidemiology worldwide,and to summarize the achievements in military epidemiology in recent five years,so as to provide an orientation of development of epidemiology in the future. Methods Research articles in the field of epidemiology published were retrieved by information research method. The progress in basic theory,research methods and field application of epidemiology were summarized and the developmental tendency of the subject was analyzed. Results As a basic subject of preventive medicine,epidemiology had made rapid progress in principles and study methods in recent years,and played an important role in diseases prevention and control. The advances in epidemiology mainly encompassed three aspects. Firstly,the study field had extended from only focusing on human diseases to human health and all health-related public health events. Secondly,several branches of epidemiology developed quickly,including field epidemiology,macroepidemiology,fundamental epidemiology and human genome epidemiology. The related study methods had been used for investigating the risk factors of diseases,controlling disease epidemics,decreasing impact of health events,and evaluating the effects of intervention. Thirdly,many new methods and technologies,such as molecular biological technologies and spatial information technologies,had been applied in epidemiological researches. Military epidemiology had obtained remarkable achievements in surveillance of diseases as well as epidemiological studies and prevention of common infectious diseases,natural focus diseases,injury and mental diseases in the armed forces. Conclusions In future,infectious disease epidemiology is still the most important subject in military epidemiology. More attention should be given to noninfectious diseases,especially traumas and mental health problems of the servicemen. Also,introduction of advanced technologies and methods will be helpful for prevention and control of related diseases.

Objective To study the relation between elderly hypertensive patients with accompanying type 2 diabetes mellitus and characteristics of ambulatory blood pressure. Methods 46 elderly hypertinsive patients with accompanying type 2 diabetes mellitus (experimental group) and 46 patients with essential hypertension (control group) through 24 hours use MEIGAOYI ambulatory blood pressure monitor. Results Comparison finds elderly hypertinsive patients with accompanying type 2 diabetes mellitus have lost normal blood pressure day and night rhythm, especially in aspect of obvious increasing of systolic pressure load and night systolic pressure. The results showed statistically significance (P<0.01,P<0.05). Conclusion For such elderly hypertinsive patients with accompanying type 2 diabetes mellitus treatment on high blood pressure should not only lower down too high blood pressure, but also lower down blood pressure steadily throughout 24 hours in the day and resume day & night rhythm.

Objective:To investigate the clinical effect of free deep femoral artery third perforating flap repaired soft tissue loss after Pilon fracture surgery in I stage.Methods:Fifteen patients were treated from April, 2013 to January, 2020. Miller AO classification: 8 cases 43-C1, 4 cases 43-C2 and 3 cases 43-C3. All cases were accompanied with severe soft tissue contusion and skin necrosis. After fracture reduction, soft tissue defects, internal fixation exposure and tendon exposure around the wound. Free deep femoral artery third perforating flap (3.5 cm ×15.5 cm to 5.5 cm×12.5 cm) for the repair of soft tissue defects around ankle in the I stage, the blood vessels of the flap were end-to-side anastomosed with vessels of the posterior tibial or anterior tibial. Regular follow-up after surgery.Results:One case of venous crisis occurred, other 14 cases survived, were followed-up from 5 to 18 months, the ankle joint function was good, did not affect the foot shoes, with excellent color and texture, the flap restored protective sensation, and leaving only linear scar, no muscle adhesion.Conclusion:Free deep femoral artery third perforating flap repaired soft tissue loss of surgical incision after fracture operated than significantly reduce the postoperative fracture infection and protect the blood supply around the fracture. It is an effective method of repair.

Objective: To explore the diagnosis, treatment and prognosis of synovial chondroma in the temporomandibular joint and to provide a reference for clinical diagnosis and treatment. Methods : A case of right temporomandibular joint synovial chondromatosis admitted to the Stomatological Hospital, Southern Medical University was reported, and the related literature was reviewed and analyzed. Results : During the movement of the mandibular opening, noise and obvious pain were found. The imaging features showed that several free calcification shadows of different sizes were seen around the condyle in the right articular fossa. The right temporomandibular joint mass resection and articular disc reduction were performed under general anesthesia, and the postoperative pathological results showed synovial chondromatosis. The patient′s symptoms were relieved 3 months after the surgery, and the imaging examination showed no residual lesions. A review of the literature shows that synovial chondromatosis usually occurs in large joints, such as the knee, hip, elbow, and shoulder joints, and rarely occurs in the temporomandibular joint. It occurs in middle-aged patients, manifesting as pain, swelling, and limited movement. Imaging studies play an important role in diagnosis, but the final diagnosis requires pathological diagnosis. Surgical treatment is effective, and synovial chondromatosis does not easily relapse. Conclusion The diagnosis of TMJ synovial chondroma should be combined with clinical manifestations, imaging features, and pathological examination. Surgery is an effective treatment. After completely removing the diseased and affected tissues, the disease has a good prognosis and does not easily relapse.