Table 2.

Prevalence of ultrasonographic abnormalities according to dactylitis duration (shorter or longer than the median: 20 weeks).

Variables	< 20 Weeks	≥ 20 Weeks	p
Total cases	54	46
GS flexor tenosynovitis, all cases	93	83	ns
GS flexor tenosynovitis grade ≥ 2	65	24	0.001
PD flexor tenosynovitis, all cases	87	54	< 0.001
PD flexor tenosynovitis grade ≥ 2	74	37	0.001
Soft tissue edema	97	82	0.018
PDS	96	71	0.001
GS extensor tendon involvement	9	15	ns
PD extensor tendon involvement	9	11	ns
GS synovitis involving at least 1 joint	18	65	< 0.001
PD synovitis involving at least 1 joint	9	35	0.02
MCP GS synovitis, all cases	11	20	ns
MCP GS synovitis grade ≥ 2	0	4	ns
MCP PD synovitis, all cases	6	9	ns
MCP PD synovitis grade ≥ 2	2	6	ns
PIP GS synovitis, all cases	6	54	< 0.001
PIP GS synovitis grade ≥ 2	6	45	< 0.001
PIP PD synovitis, all cases	6	30	0.001
PIP PD synovitis grade ≥ 2	4	4	ns
DIP GS synovitis, all cases	9	8	ns
DIP GS synovitis grade ≥ 2	3	6	ns
DIP PD synovitis, all cases	3	4	ns
DIP PD synovitis grade ≥ 2	0	0	ns
GS flexor tenosynovitis plus soft tissue edema	91	65	0.002
GS flexor tenosynovitis plus GS synovitis involving at least 1 joint	18	48	0.001
Soft tissue edema plus GS synovitis involving at least 1 joint	19	50	0.001

Data are percentages. DIP: distal interphalangeal; GS: greyscale; MCP: metacarpophalangeal; PD: power Doppler; PDS: subcutaneous PD signal; PIP: proximal interphalangeal; ns: not significant.