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Table 2 Frequency of individual joint involvement at presentation (percentage)

From: Juvenile Psoriatic Arthritis (JPsA): juvenile arthritis with psoriasis?

  ERA N=16 Persistent oligoarticular course N=44 Extended oligoarticular course N=21 RF-N=34 polyarticular course N=55 Total cohort N=115 P value
Knee 6 (37.5) 32 (72.7) 15 (71) 24 (70) 39(70) 77 (66.9) 0.06
Ankle 5 (31.2) 9 (20.4) 7 (33) 17 (50) 24(44) 38 (33.0) 0.05
Subtalar 2 (12.5) 3 (6.8) 3 (14.3) 5 (14.7) 8(14.5) 13 (11.3) 0.7
Hip 5 (31.2) 5 (11.4) 0 (0) 0 (0) 0(0) 10 (8.7) 0.0012
Shoulder 1 (6.2) 1 (2.3) 1 (4.7) 3 (8.8) 4(7) 6 (5.2) 0.63
Elbow 1 (6.2) 3 (6.8) 3 (14.3) 9 (26.5) 12(21.8) 16 (13.9) 0.07
Wrist 1 (6.2) 4 (9.0) 7 (33) 13 (38.2) 20(36.3) 25 (21.7) 0.038
MCP 2 (12.5) 3 (6.8) 2 (9.5) 12 (35.3) 14(25.4) 19 (16.5) 0.005
PIP of Hand 3 (18.7) 6 (13.6) 2 (9.5) 18 (52.9) 20(36.3) 29 (25.2) 0.0002
DIP of Hand 2 (12.5) 2 (4.6) 0 (0) 6 (17.6) 6(10.9) 10 (8.7) 0.08
TMJ 1 (6.2) 2 (4.6) 6 (17.6) 6 (17.6) 6(10.9) 9 (7.8) 0.07
Cervical spine 0 (0) 2 (4.6) 0 (0) 0 (0) 1(1.8) 2 (1.7) 0.50
Sacroiliac 5 (31.2) 0 (0) 0 (0) 0 (0) 0(0) 5 (4.3) <0.0001
Any small joint* 6 (37.5) 12 (27.3) 5 (24) 25 (73.5) 30(54.5) 48 (41.7) 0.0001
  1. MTP metatarsal phalangeal joint.
  2. PIP proximal interphalangeal joint.
  3. MCP metacarpal phalangeal joint.
  4. DIP distal interphalangeal joint.
  5. *any small joint refers to: PIP of hands and feet, MCP, and MTP.