Patients with complete staghorn stones who are eligible to percutaneous nephrolithotomy (PNL) will be randomized between two groups.~Group 1: will undergo Laser lithotripsy during PNL Group 2: will undergo ultrasonic lithotripsy during PNL
This study will be conducted to compare the results of Laser and ultrasonic lithotripsy in disintegration of staghorn stones during percutaneous nephrolithotomy.