目的探讨高频超声在类风湿性关节炎(RA)膝关节病变中的诊断价值。
Objective to investigate the diagnostic value of high-frequency ultrasound on knee joint diseases of rheumatoid arthritis (ra).
目的：分析探讨人工旋转铰链膝关节置换术在复杂膝关节病变中的临床应用效果。
Objective: To analyze and discuss the clinical effect of the application of rotating hinge knee arthroplasty in complex gonarthrosis.
背景知识概要：髌股关节疼痛综合症是最常见的膝关节病变之一，可能和异常的髌骨轨迹有关。
Background: Patellofemoral pain syndrome is one of the most common knee problems and may be related to abnormal patellar tracking.
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