Table 5 Sensitivity and specificity of US, x-ray, and clinical examination, with MRI as the standard reference method
US sensitivity | US specificity | X-ray sensitivity | X-ray specificity | Clinical examination sensitivity | Clinical examination specificity | |
|---|---|---|---|---|---|---|
Bone erosions | ||||||
MCP joint | 0.56 | 0.93 | 0.38 | 0.99 | NA | NA |
PIP joint | 0.57 | 0.88 | 0.40 | 0.95 | NA | NA |
DIP joint | 0.00 | 0.99 | 0.67 | 0.97 | NA | NA |
Bone proliferations | ||||||
MCP joint | 0.00 | 0.97 | 0.00 | 0.96 | NA | NA |
PIP joint | 0.50 | 0.96 | 0.00 | 0.96 | NA | NA |
DIP joint | 1.00 | 0.95 | 1.00 | 0.98 | NA | NA |
Synovitis | ||||||
MCP joint | 0.70 | 0.88 | NA | NA | 0.31 | 0.74 |
PIP joint | 0.50 | 0.88 | NA | NA | 0.25 | 0.76 |
DIP joint | 0.40 | 0.87 | NA | NA | 0.00 | 0.83 |
Tenosynovitis | ||||||
MCP joint | 0.38 | 0.99 | NA | NA | NA | NA |
PIP joint | 1.00 | 0.86 | NA | NA | NA | NA |
DIP joint | 0.67 | 0.98 | NA | NA | NA | NA |
Insertional changes | ||||||
Extensor tendons | 0.50 | 0.96 | NA | NA | NA | NA |
Flexor tendons | 1.00 | 0.95 | NA | NA | NA | NA |
Capsular/extracapsular changes | 1.00 | 0.88 | NA | NA | NA | NA |