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Table 2 Comparison of clinical and radiological features between the two types of osteoid osteoma

From: Clinical and radiological features and skeletal sequelae in childhood intra-/juxta-articular versus extra-articular osteoid osteoma

Variables Intra- /juxta-articular (n = 11) Extra-articular (n = 23) p-value
Classic symptom 4 16 0.135*
Synovitis 8 0 <0.001*
Misdiagnosis 7 5 0.026*
Typical nidus 4 18 0.026*
Skeletal abnormality 5 1 0.008*
Diagnostic delay (months) 12 (1.5 to 18) 1.5 (1 to 6) 0.002**
  1. Data presented as number of patients who had each clinical and radiologic feature, except diagnostic delay in which data presented as median (range). *Fisher’s exact test, **Mann–Whitney test.