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

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.

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