Appropriate kidney stone size for ureteroscopic lithotripsy: When to switch to a percutaneous approach

Table 3 Treatment outcomes of ureteroscopy for large kidney stones

Ref	Study type	No. of	Mean stone	Mean number	SFR after the	SFR after the
		patients	diameter	of operation	1st operation	2nd operation
Ricchiuti et al[12]	Single center, retrospective	23	3.1 cm	1.43	56.5%	73.9%
Breda et al[13]	Single center, retrospective	15	2.2 cm	2.3	60%	86.6%
Riley et al[14]	Single center, retrospective	22	3.0 cm	1.82	23%	86.4%
Hyams et al[15]	Multi center, retrospective	120	2.4 cm	1.18	83%	97.5%
Takazawa et al[10]	Single center, retrospective	20	3.1 cm	1.4	65%	95%

SFR: Stone free rate.