Joint Involvement in Primary Sjögren’s Syndrome: An Ultrasound “Target Area Approach to Arthritis”

Table 2

Presence of synovitis in the study groups.

Joint	Primary Sjögren’s syndrome (𝑛=17)	Secondary Sjögren’s syndrome (𝑛=18)	𝑃 value*	No-Sjögren controls (𝑛=17)	𝑃 value**
1st MCP	9	11	ns	1	0.006
2nd MCP	9	16	0.02	4	ns
3rd MCP	6	11	ns	4	ns
4th MCP	2	10	0.01	4	ns
5th MCP	3	5	ns	4	ns
1st IP	2	4	ns	3	ns
2nd PIP	1	3	ns	0	ns
3rd PIP	0	1	ns	1	ns
4th PIP	0	2	ns	3	ns
5th PIP	0	3	ns	0	ns
Wrist	13	17	ns	13	ns
Elbow	1	7	0.04	1	ns
Knee	13	17	ns	15	ns
Ankle	0	3	ns	3	ns

∗Differences between patients with primary and secondary Sjögren’s syndromes.
**Differences between patients with primary Sjögren’s syndrome and no-Sjögren controls.
Abbreviations: MCP: metacarpophalangeal joints; IP: interphalangeal joint; PIP: proximal interphalangeal joints; PD: power Doppler signal.