Table 2.

Characteristics of RF ablation of osteoid osteoma in hip–pelvic region

	Laser guidance	Freehand	p value
Osteoid osteoma locations	Femur: n = 9 Pelvic bone: n = 1	Femur: n = 5 Pelvic bone: n = 3
Age (year)	11 (4–34)	26 (16–54)	0.011*
Diameter of irradiated anatomy (cm)	19.4 (16.2–28.3)	27.5 (12.4–31.9)	0.052
Target size (mm)	8 (6–10)	7.5 (6–10)	0.965
Length needle trajectory (mm)	54 (36–80)	65 (31–113)	0.372
Fluoroscopy time (sec)	215 (75–413)	384 (193–878)	0.012*
Percentage collimated fluoroscopy	44 (12–65)	38 (0–74)	0.657
No. of scans	4 (2–7)	5 (3–7)	0.308
Procedure time (min)	51 (30–72)	58 (35–79)	0.172

Data presented as median (range). The asterisk represents a statistically significant difference between the freehand technique and laser-guided procedures