目的 探讨踝关节滑液血管活性肠肽水平(VIP)与踝创伤性关节炎(PTAOA)关节软骨破坏,影像学以及症状严重程度的相关性.方法 选取在我院进行踝关节镜清理术或关节置换术的患者74例以及正常体检者69例,术前抽取患者的血清和踝关节滑液,影像学分级采用改良踝关节Kellgren-Law-rence(KL)影像学评分系统,患者症状功能评定采用Teeny&Wiss和AOFAS足踝功能评分系统,软骨组织学退变得分采用改良Mankin得分.应用酶联免疫吸附试验(ELISA)测定患者关节滑液VIP水平,炎症因子IL-6水平以及软骨退变相关因子Ⅱ型胶原C端肽(CTX-Ⅱ).结果 血清VIP水平在患者与正常对照组间比较差异无显著性,关节滑液VIP水平与K-L分级,改良Mankin得分以及IL-6和CTX-Ⅱ呈显著负相关性,此外关节滑液VIP水平与Teeny&Wiss和AOFAS得分呈正相关.结论 踝关节滑液VIP的低表达反映了PTAOA严重程度,可作为PTAOA预后进展的标记物.%Objective To explore the association of synovial fluid vasoactive intestinal peptide levels with cartilage damage,radiological changes and symptomatic severity in patients with ankle post-traumatic osteoarthritis. Methods 74 patients with ankle traumatic osteoarthritis undergoing ankle anthroscopic debridement or joint replacement and 69 healthy controls receiving body check were enrolled in the this study. Serum and synovial fluid VIP concentrations were measured by a special radioimmunoassay method. Cartilage degradation biomarker colla-gen type Ⅱ(CTX-II)and inflammatory marker interleukin-6 were determined by enzyme-linked immunosorbent assay (ELISA). The symptomatic and functional severity was evaluated using Teeny & Wiss and AOFAS ankle-hindfoot rating scale. The radiographic progression of PTAOA was identified according to the modified ankle osteoar-thritis Kellgren-Lawrence (K-L) grading system. The mankin score was used for assessing the histopathological severity for cartilage lesions. Receiver operating characteristic (ROC) curve was conducted and the area under curve(AUC)was used to evaluate the diagnostic value of VIP,IL-6 and CTX-II levels for the prediction of the modified K-L grading by comparing with other biomarkers. Results There were no significant differences in serum VIP levels between PTAOA patients and controls. VIP levels in synovial fluid showed a negative correlation with modified ankle K-L grading,Mankin scores,CTX-Ⅱand IL-6. In addition,VIP levels were also positively associated with Teeny&Wiss and AOFAS ankle-hindfoot scores. The AUC area of VIP was similar to CTX-Ⅱat early stage of the disease. Conclusions Synovial fluid VIP levels show an independent and negative correlation with disease severity in patients with PTAOA. Low level of VIP in SF can be used as a potential biomarker for reflecting disease progression.
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