Characteristics of the reviewed articles.
| Year | Authors | Type of Article | Sample Size (Patients) | Sample Size (Digits) | Population of Interest | Face Validity |
|---|---|---|---|---|---|---|
| Ultrasound | ||||||
| 2006 | Fournie | Case series | 20 | 25* | PsA vs RA | Y |
| 2006 | Ribes | Case series | 17 | 20* | PsA vs RA | Y |
| 1999 | Kane | Case series | 17 | 25* | PsA with dactylitis | N |
| 1996 | Olivieri | Case series | 10 | 12* | PsA with dactylitis | Y |
| MRI | ||||||
| 2008 | Healy | Case series | 17 | 23* | PsA with dactylitis | Y |
| 2008 | Olivieri | Case series | 10 | 12* | SpA with dactylitis | P |
| 2002 | Olivieri | Case series | 6 | 11* | SpA with dactylitis | N |
| 1997 | Olivieri | Case series | 7 | 12* | SpA with dactylitis | P |
| 1996 | Olivieri | Case series | 10 | 12* | PsA with dactylitis | Y |
| 1995 | Jevtic | Case series | 2 | 2 | PsA, RA, reactive arthritis | Y |
↵* Denotes level of analysis. P: partial; PsA: psoriatic arthritis; SpA: spondyloarthritis; MRI: magnetic resonance imaging; RA: rheumatoid arthritis.