Table 3.

Frequency of the various US B-mode changes at each examined entheseal site in the 3 populations.^*

Entheseal site	Entheseal Thickening			Entheseal Hypoechogenicity			Peritendon Hypoechogenicity			Bony Erosions			Enthesophytes			Enlarged Bursa
Entheseal site	PsA	Psoriasis	FMS	PsA	Psoriasis	FMS	PsA	Psoriasis	FMS	PsA	Psoriasis	FMS	PsA	Psoriasis	FMS	PsA	Psoriasis	FMS
Common extensor insertion on the epicondyle	21 (15)	3 (5.9)	3 (5.9)	26 (18.6)	6 (11.8)	8 (15.7)	7 (5)	1 (2)	1 (2)	12 (8.9)	1 (2)	4 (7.8)	31 (22.1)	10 (20)	6 (11.8)	1 (0.7)	1 (2)	1 (2)
Quadriceps tendon	41 (29.3)	11 (21.6)	9 (17.3)	34 (30.7)	14 (27.4)	15 (29.4)	8 (5.7)	1 (2)	0	4 (2.9)	2 (3.9)	0	63 (45)	23^§ (45.1)	8^† (15.7)	11 (7.9)	2 (3.9)	3 (5.9)
Patellar tendon	49 (35)	11 (21.6)	4^† (7.8)	49 (35)	12 (23.5)	4 (7.8)	11 (7.9)	0	2 (3.9)	9 (6.4)	3 (5.9)	1 (2)	29 (20.7)	9 (17.6)	4^† (7.8)	11 (7.9)	3 (5.9)	1 (2)
Medial collateral ligament	9 (6.4)	0	1 (2)	19 (13.6)	3 (5.9)	0^{^†}	5 (3.6)	0	0	9 (6.4)	1 (2)	0	6 (4.3)	0	0	2 (1.4)	2 (3.9)	0
Achilles tendon	32 (22.9)	5^† (9.8)	2^† (3.9)	40 (28.6)	9 (17.6)	4^† (7.8)	12 (8.6)	4 (7.8)	1 (2)	15 (10.7)	1 (2)	1 (2)	66 (47.1)	27^§ (52.9)	13^† (25.5)	25 (17.9)	4 (7.8)	5 (9.8)
Plantar fascia insertion on the calcaneus	30 (21.4)	7 (13.7)	4^† (7.8)	25 (17.9)	3 (5.9)	2 (3.9)	5 (3.6)	1 (2)	0	5 (3.6)	0	0	19 (13.6)	4 (7.8)	2^† (3.9)	0	0	0

Data are shown as no. patients (%) and expressed in terms of affected patients.
↵* PsA: n = 140 patients; psoriasis: n = 51 patients; FMS: n = 51 patients.
↵† Significant difference vs PsA.
↵§ Significant difference vs FMS. FMS: fibromyalgia syndrome; PsA: psoriatic arthritis; US: ultrasonography.