关节是骨连结的最高级形式。骨关节内外、控制关节运动的神经及肌肉的损伤约会造成关节运动功能障碍，关节活动受限是关节功能障碍重要形式。《人身重伤鉴定标准》简称《重伤标准》中肢体残废部分规定，四肢大关节活动度丧失达50％属重伤。《道路交通事故受伤人员伤残评定》（? The joint is the most advanced form of bone link. Osteoarticular joints, both inside and outside the bone and joint, to control the movement of the nerves and muscle damage will cause joint movement disorders, limited joint activity is an important form of joint dysfunction. “Criteria for Criteria for Severe Serious Injury” Shortly referred to as the “Criteria for Severely Injured”, the part of the handicapped in the limbs stipulates that the loss of mobility of the limbs and joints by 50% is seriously injured. “Disability assessment of injured persons in road traffic accidents” (?