目的：研究医护人员长航时舰上生活肌肉关节损伤情况，及膝关节疼痛的可能原因。方法以“环太平洋-2014”和“和谐使命-2014”任务为背景，通过问卷调查，以VAS计量比较启航前及航行8周后肌肉关节症状及相关因素的变化，并统计分析膝关节疼痛可能的原因。结果长航后医务人员99%存在其中某1种不适，86.5%出现程度不一的膝关节疼痛，其中明显膝关节疼痛（VAS＞3）的发生率为48.1%。膝关节疼痛、全身无力、上肢肌痛、下肢肌痛、腰痛、颈部疼痛、睡眠障碍、食欲下降的发生率和VAS值均显著增加。多因素分析见高体质量指数（BMI）和下肢肌痛为膝关节活动时疼痛的发生的主要因素，其次是增龄。结论医护人员在长航后身体状态发生明显变化，可产生多种不适。甲板上膝关节活动痛主要与高BMI和下肢肌肉伤病有关。“,”Objective To survey articular and muscular injuries in health care workers living on deck after a long voyage, and to investigate possible causes of knee pain. Methods In the setting of rim of the pacific 2014 ( RIMPAC-2014 ) and Mission Harmony-2014, questionnaires were delivered to all recruited health care workers, before and 8 weeks after sailing. Investigation items included muscular-articular symptoms and other related factors, and knee pain causes were subsequently evaluated by regression analysis. Results After the long voyage, 99%of the respondents reported experiencing discomforts, and the incidence of knee pains was 86.5%, among which 48.1%of the personnel apparently had knee pains(VAS>3).The incidences and VASs of knee pains, weakness, myalgia in upper limbs and lower limbs, back pain, neck pain, sleep disorder and impaired appetite were significantly higher than the baseline values of departure. Analysis of risk factors to knee pains demonstrated that the primary cause was high body mass index(BMI)as well as myalgia in lower limbs, and the secondary cause was aging. Conclusions Most health care workers experienced discomforts after the long voyage. Knee pains on deck were predominantly related to high BMI and to myalgia in lower limbs.