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Table 2 The clinical presentations in GBS and other bacterial septic arthritis group

From: Group B streptococcus is the most common pathogen for septic arthritis with unique clinical characteristics: data from 12 years retrospective cohort study

Variable All (231) GBS group (87) Other bacterial group (144) p-value
Symptom duration: Median (IQR25-IQR75) 5.0 (2.0–10.0) 5.0 (2.0–10.0) 4.0 (2.0–7.0) 0.655
Initial temperature: Median (IQR25-IQR75) 37.8 (37.0–38.4) 37.9 (37.2–38.5) 37.8 (37.0–38.3) 0.301
Number of joint involvement: Median (IQR25-IQR75) 1.0 (1.0–3.0) 3.0 (1.0–5.0) 1.0 (1.0–2.0) < 0.001
Pattern of joint involvement (n, %)
 Monoarthritis 122, 52.8% 24, 27.6% 98, 68.1% < 0.001
 Oligoarthritis 58, 25.1% 27, 31.0% 31, 21.5% 0.106
 Polyarthritis 51, 22.1% 36, 41.4% 15, 10.4% < 0.001
 Upper joint involvement 113, 48.9% 62, 71.3% 51, 35.4% < 0.001
 Axial joint involvement 61, 26.4% 33, 37.9% 28, 19.4% 0.002
 Small joint involvement 22, 9.5% 9, 10.3% 13, 9.0% 0.741
Site of joint involvement (n, %)
 Knee 146, 63.2% 56, 64.4% 90, 62.5% 0.775
 Ankle 59, 25.5% 30, 34.5% 29, 20.1% 0.015
 Shoulder 58, 25.1% 29, 33.3% 29, 20.1% 0.025
 Wrist 41, 17.7% 27, 31.0% 14, 9.7% < 0.001
 Sternoclavicular 28, 12.1% 19, 21.8 9, 6.3% < 0.001
 Elbow 22, 9.5% 15, 17.2% 7, 4.9% 0.002
 Spine 17, 7.4% 12, 13.8% 5, 3.5% 0.004
Site of joint involvement (n, %)
 MCP 13, 5.6% 12, 13.8% 1, 0.7% < 0.001
 PIP 14, 6.1% 12, 13.8% 2, 1.4% < 0.001
 Hip 25, 10.8% 11, 12.6% 14, 9.7% 0.489
 AC 13, 5.6% 8, 9.2% 5, 3.5% 0.081
 MTP 16, 6.9% 8, 9.2% 8, 5.6% 0.291
 Interphalangeal of toe 4, 1.7% 4, 4.6% 0, 0% 0.019
 Sacroiliac 5, 2.2% 2, 2.3% 3, 2.1% 0.624
Extra articular involvement (n, %)
 Tenosynovitis 37, 16.0% 34, 39.1% 3, 2.08% < 0.001
 CNS 13, 5.7% 9, 10.3% 4, 2.8% 0.035
 Skin involvement 30, 13.0% 6, 6.9% 24, 16.7% 0.032
 Tendon rupture 5, 2.2% 4, 4.6% 1, 0.7% 0.068
 Ocular involvement 3, 1.3% 3, 3.4% 0, 0% 0.052
 Cardiac involvement 6, 2.6% 1, 1.1% 5, 3.5% 0.414
Concomitant infection (n, %) 57, 24.7% 4, 4.6% 53, 36.8% < 0.001
  1. p < 0.05 defined statistical significance, IQR: Interquartile range, symptom duration: Duration from the onset of joint symptoms to the hospital admission, IQR Interquartile range, SC Sternoclavicular, MCP Metacarpophalangeal, PIP Proximal interphalangeal, AC Acromioclavicular, MTP Metatarsophalangeal, CNS Central nervous system, GBS Streptococcus group B
  2. Upper joint included sternoclavicular joints, acromioclavicular joints, shoulder joints, elbow joints, wrist joints, metacarpophalangeal joints and proximal interphalangeal joints
  3. Axial joint included sternoclavicular joints, acromioclavicular joints, shoulder joints, sacroiliac joint, hip joints and spine
  4. Small joint included metacarpophalangeal joints, proximal interphalangeal joints, metatarsophalangeal joints,wrist and interphalangeal joints of toes