Resorlu-Unsal Stone Score (RUSS) for Predicting Outcome Following Retrograde Intrarenal Surgery

Description

Resorlu, Unsal et al reported the Resorlu-Unsal Stone Score (RUSS) for patients with nephrolithiasis. This can be used to predict the outcome following retrograde intrarenal surgery. The authors are from Kecioren Training and Research Hospital and Ankara University in Turkey.

Parameters:

(1) stone size in mm

(2) location of the stone and infundibulopelvic angle (IPA) in degrees

(3) number of stones in different calyces

(4) renal anatomy

Parameter	Finding	Points
stone size	<= 20 mm	0
	> 20 mm	1
location of stone and IPA	lower pole AND IPA < 45°	1
	other	0
number of stones	1 stone OR 1 calyx	0
	2 or more stones in different calyces	1
renal anatomy	normal	0
	abnormal (pelvic kidney, horseshoe, other)	1

where:

• Infundibulopelvic angle (IPA) is the inner angle formed by (central axis of the the lower pole infindibulum) and (ureteropelvic axis).

• Stone size presumably refers to the largest stone.

• While the text states that the maximum score is 4, Table 4 suggests that larger stones would be scored higher: 30 to 39 mm 2 points, 40 to 49 cm 3 points, etc.

total score =

= SUM(points for all 4 parameters)

Interpretation:

• minimum score: 0

• maximum score: 4

• The lower the score the greater the stone-free rate following retrograde intrarenal surgery.

RUSS	Stone Free
0	97%
1	85%
2	70%
3 or 4	27%

To read more or access our algorithms and calculators, please log in or register.

Description

Specialty

ICD-10