The main objective of this study is to evaluate the effectiveness of an auto posturotherapy technique on the RFS at three months of patients treated for lower calyceal urinary stones by extracorporeal lithotripsy (ECL) or retrograde flexible ureteroscopy.

pré Inclusion Criteria:

• Patient having read and signed the consent form for participation in the study • Patient candidate for an intervention on a lower calyx stone <15mm by LEC or URSS

Patients meeting all of the following criteria may be definitively included in the study:

• Patient treated by LEC, or patient treated by URSS and for whom the presence of lower calyceal fragments has been observed by endoscopy
• Absence of JJ stent (patients for whom a JJ stent was implanted after URSS or before LEC may be included as soon as it is removed)

Exclusion Criteria:

• Patients presenting one of the following criteria will not be included in the study:

  • Renal or ureteral malformation: ureteral stenosis, pyelo-ureteral junction syndrome, horseshoe kidney, para calyceal diverticulum, pelvic kidney.
  • LEC session interrupted due to treatment intolerance
  • Physical disability making posturotherapy impossible (particularly spinal, etc.), morbid obesity, major gastroesophageal reflux, heart or respiratory failure.
  • Balance disorder which would not allow self-posturotherapy to be carried out alone.
  • Patient under legal protection, under guardianship or under curatorship
  • Posturotherapy carried out while wearing a JJ probe
  • Posturotherapy carried out by a third party (physiotherapist or other)
  • Pregnant or breastfeeding patient
  • Patient not affiliated to the French social security system
  • Impossibility of providing the subject with informed information and/or giving written informed consent: dementia, psychosis, disorders of consciousness, non-French speaking patient
  • Treatment that may modify the clearance of fragments (beta blocker, diuretic, etc.)
  • Patient included in another therapeutic study protocol