Table 1.
Demographic characteristics of the intra-/juxta-articular osteoid osteoma and extra-articular osteoid osteoma
| Variables | Intra-/juxta-articular (n = 11) | Extra-articular (n = 23) | p -value | |
|---|---|---|---|---|
| Sex (F : M) | 6 : 5 | 16 : 7 | 0.459* | |
| Age at diagnosis (yr) | 10.4 (4.1 to 14.8) | 10.4 (4.3 to 15.9) | 0.740** | |
| Follow-up period (yr) | 4.7 (2.0 to 8.1) | 5.0 (2.4 to 11.8) | 0.619** | |
| Treatment method | RFA | 5 | 11 | |
| Resection | 3 | 7 | 1.000* | |
| NSAIDs | 3 | 5 | ||
| Diagnostic study | Plain radiography | 11 | 23 | |
| CT | 9 | 12 | ||
| MRI | 10 | 5 | ||
| Bone scan | 2 | 8 | ||
RFA, radiofrequency ablation; NSAIDs, non-steroidal anti-inflammatory drugs. Data presented as number of patients for sex, diagnostic study and treatment methods, and data presented as median (range) for age at diagnosis and follow-up period. *Fisher’s exact test, **Mann–Whitney test.