الفهرس 
Mechanism of urine formationOnly 14 pages are availabe for public view
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Abstract
Background: PCNL is the gold standard treatment modality of large and complex kidney stones. We compared the stone free status predicting ability of Guy’s stone score and S.T.O.N.E. score system.
Objective: To compare to compare between Guy stone score and S.T.O.N.E score system in predicting stone free rate after PCNL.
Patients and Methods: A total number of 40 patients underwent PCNL in the period between December 2021 and May 2022. All cases were evaluated and graded using both Guy score and S.T.O.N.E. score based on preoperative computerized plain ctut. The post operative stone free status was evaluated using post operative plain KUB xray and ctut. Statistical analysis was done to determine relation of the scores with the post-operative stone free status. Also receiver operating characteristics curves (ROC) was drawn and area under the curve was calculated to assess the scores predictability of post-operative stone free status.
Results: The overall stone free rate of our study was 80%. Mean age of study population was 43 years (±SD10.60). we found that stone free patients had lower mean Guy score (2.00 vs 3.38) and lower mean S.T.O.N.E. score (7.84 vs 9.75). both scores had statistically significant relation with stone free status the P value was 0.001 for Guy score and 0.022 for S.T.O.N.E. score. The post operative stone free status predictability of both scores was assessed by drawing receiver operating characteristics curves (ROC) and the area under the curve was calculated by ROC curve. When comparing area under the curve for both scores we found no great difference between guy score and S.T.O.N.E. score (0.867 – 95% CI 0.735-1.000) vs (0.760– 95% CI 0.569-0.951).
Conclusion: The study shows that both Guy score and S.T.O.N.E. score systems have similar predicting ability of post PCNL stone free status with strong correlation with post operative stone free status