Objective To summarize the characteristics of the constitution of orthopedic diseases among soldiers in a sea area,so as to provide the reference for the rational allocation of medical resources,the prevention and treatment of orthopedic diseases,and the improvement of naval medical support.Methods Medical records on injuries of the outpatient and emergency departments in a hospital ship from February 2021 to April 2022 were retrospectively analyzed.The number of varying orthopedic diseases was counted,and descriptive statistical analysis was conducted.Results A total of 200 cases were included in the statistical analysis.The top five diseases were chronic low back pain,knee pain,tibial contusion,wrist joint injury,and shoulder joint injury,and they accounted for 82%of the total orthopedic diseases.Conclusion The medical team stationed on hospital ships should be guided by actual medical needs of officers and soldiers on island,enhance the diagnosis and treatment of common orthopedic diseases,formulate scientific and reasonable prevention and treatment strategies.The allocation of medical materials and personnel should be in line with the spectrum of orthopedic diseases as far as possible to reduce non-combat casualty and strengthen the combat effectiveness of the army.

Objective To explore the features of polymorphism in ADRA2A gene phenotypes and their relationship to oxygen endurance in the Han servicemen in PLA.Methods One hundred and eight healthy recruits of Han ethnic were subjected to a 5000-meter race program for 18 weeks,and then the tests were done after a 5000-meter race.The ADRA2A allelic variant and genotype were analyzed by polymerase chain reaction and sequencing,and the features of polymorphism in three sites,G6412C,T6623A and C6645C,were determined with biochemical technique.The relationship between the results after the 5000-meter race,and the polymorphism of ADRA2A was then analyzed.Results The genotype distribution at all the three locations was consistent with the Hardy-Weinberg equilibrium.The genotype frequency in T6623A of A/G(50%)was higher than that of G/G(26%)and A/A(24%).The allele frequency of A(51%)was higher than that of G(49%).The time for completing 5000-meter running was significantly longer in recruits carrying A/G(20.95?0.82min)than those carrying A/A(18.97?0.65min,P0.05).There was no significant association between the oxygen endurance capacity and the polymorphism of G6412C and C6645C.Conclusion The T6623A of ADRA2A was the ideal gene marker for predicting endurance capacity,but G6412C and C6645C polymorphism is not ideal gene marker for oxygen endurance.