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Table 1 Clinical features of enthesitis-related arthritis with C1-C2 subluxation

From: C1-C2 subluxation in enthesitis-related arthritis: two case reports and literature review of ten cases

Patient / [Ref.]

Age (yr) at onset of C1-C2 subluxation / Gender

C1-C2 subluxation onset after initial disease presentation

History of (suspected) trauma

Laboratory examination

Involvement

    

HLA-B27

ANA

RF

CRP (mg/dL)

ESR (mm/hr)

 

1 / [12]

9 / Male

 > 3 months

None

 + 

-

-

None

Elevated

Arthritis with synovitis of right knee, left ankle and left elbow; iritis of left eye

2 / [13]

12 / Male

8 months

None

 + 

- *

-

Normal

75

Left hip, left 5th metatarsal head

3 / [14]

12/ Female

2 years

Previous chiropractic manipulation of cervical spine for pain

 + 

-

-

None

None

Right knee, left Achilles tendon, right mid-foot small joints, proximal interphalangeal joints

4 / [13]

13 / Male

0 months †

None

 + 

-

-

None

90

Left knee, left SI joint, both Achilles tendons, left patellar tendon insertions to the patella and tibial tubercle, insertions of the plantar fascia to the calcaneum

5 / [15]

13 / Male

1 year and 1 month

None

 + 

-

-

1.5

64

Both heels, left elbow

6 / [16]

13 / Male

0 months †

None

 + 

-

-

None

None

Anterior uveitis with iridolenticular synechiae and band keratopathy

7 / Present patient

8 / Male

6 months

Colliding with a classmate

 + 

-

-

3.09

116

Left heel, left big toe, right proximal interphalangeal joint of the ring finger

8 / [17]

7 / Female

0 months †

None

-

-

-

Not mentioned at initial disease presentation

30–40

Both knees, both ankles, bilateral SI joints, lumbar spine

9 / [18]

11 / Male

6 months

Subtalar subluxation resulting from a fall

 + 

-

-

None

55

Both knees, interphalangeal joint of left thumb, left SI joints

10 / [19]

15 / Male

4 years

None

 + 

-

-

None

None

Both knees, bilateral SI joints, total spine ankylosis

11 / [20]

20 / Male

8 years

None

-

-

-

None

80

Left knee, right Achilles tendon, right plantar fascia insertion, left shoulder, bilateral SI joints, uveitis

12 / Present patient

16 / Male

1 year and 11 months

None

 + 

-

-

0.46

11

Bilateral SI joints, lumbar spine

  1. HLA-B27, human leukocyte antigen-B27; ANA, antinuclear antibodies; RF, rheumatoid factor; CRP, c-reactive protein; ESR, erythrocyte sedimentation rate; SI joint, sacroiliac joint
  2. *Although ANA was weakly detectable in this patient, other rheumatic diseases were not reported other than ERA (which was then under the umbrella of and referred to as “seronegative enthesopathy and arthropathy syndrome” before the introduction of the ILAR classification)
  3. C1-C2 subluxation was the initial presentation