Retrograde Intrarenal Surgery in Patients Who Previously Underwent Open Renal Stone Surgery

Table 1

Patient demographics and preoperative stone characteristics.

	Group 1 (study group)	Group 2 (control group)	value
Gender (M/F)	24/08	26/12	0.603
Mean age (year)	40.5 ± 12.8 (20–72)	45.5 ± 12.6 (23–74)	0.110
Mean BMI (kg/m^2)	28.1 ± 5.3 (19–42)	26.7 ± 4.1 (19–41)	0.217
Mean stone number ()	2.7 ± 1.5 (1–7)	2.5 ± 1.3 (1–8)	0.544
Mean stone size (mm)	10.1 ± 5.6 (3–30)	10.3 ± 4.2 (3–21)	0.551
Mean stone burden (mm)	25.4 ± 14.7 (7–58)	23.5 ± 9.9 (6–60)	0.504
Total stone number ()	106	101
Localization (per procedure)
Upper ureter	6 (5%)	10 (10%)
Upper calyx	14 (13%)	11 (11%)
Middle calyx	23 (22%)	18 (18%)
Lower calyx	36 (34%)	42 (41%)
Renal pelvis	27 (26%)	20 (20%)
Lateralization (per patient)
Right side	17 (53%)	13 (34%)
Left side	13 (41%)	23 (61%)
Bilateral	2 (6)	2 (5)