患者女性,56岁,农民。于6年前出现左膝关节肿胀不适,行走及劳累时加重,休息后缓解,发病后患者未曾进行过诊治。近1年患者自觉症状加重,左下肢易疲劳,左膝时有交锁现象,活动度略受限。患者无明确膝部外伤史,无午后潮热、盗汗,无夜痛加剧,无晨僵,无其它关节受累。入院体检:左膝关 Female patient, 56 years old, farmer. 6 years ago, left knee swelling and discomfort, walking and tired when exacerbated after a remission, after the onset of the patient had not been treated. Almost a year patients with symptoms increased, left lower extremity prone to fatigue, left knee interlocking phenomenon, activity was slightly limited. Patients without a clear history of knee injury, no afternoon hot flashes, night sweats, no increased night pain, no morning stiffness, no other joint involvement. Admission examination: left knee off