Yousefzadeh D K
Skeletal Radiol. 1979 Apr 10;4(1):29-33. doi: 10.1007/BF00350591.
Traction on wrist and metacarpophalangeal joints during radiography produces 'vacuum phenomenon' due to the release of intra-articular gas. The resultant pneumoarthrogram clearly portrays the articular cartilage. Manual traction radiography of the wrist and the metacarpophalangeal joints has the following potential uses. 1. Detection of joint effusion; increased interosseous space during traction without release of intraarticular gas is indicative of joint disease with effusion. 2. Separation of the carpal bones; the traction separates the carpal bones and allows evaluation. 3. Differentiation of arthralgia from arthritis. 4. Evaluation of midcarpal, radiocarpal compartments, and the metacarpophalangeal joints can be performed before the secondary ossification centers are ossified. 5. Evaluation of the integrity of the joint cartilage.
在进行X线摄影时，对腕关节和掌指关节施加牵引会因关节内气体释放而产生“真空现象”。由此产生的关节空气造影清晰地描绘出关节软骨。腕关节和掌指关节的手动牵引X线摄影有以下潜在用途。1. 检测关节积液；牵引过程中骨间隙增宽且关节内气体未释放提示存在伴有积液的关节疾病。2. 分离腕骨；牵引可分离腕骨并便于评估。3. 区分关节痛与关节炎。4. 在 secondary ossification centers 骨化之前，可对腕中关节、桡腕关节腔以及掌指关节进行评估。5. 评估关节软骨的完整性。 （注：原文中“secondary ossification centers”未翻译，可能是特定医学术语未给出准确中文对应，可根据实际医学知识补充准确翻译）
