Kidney Stone Treatment
Lithotripsy (ESWL)
Some kidney stones can be broken apart without anything entering the body at all. Extracorporeal shock wave lithotripsy focuses energy from outside the skin onto the stone, fragmenting it into pieces small enough to pass on their own. No incisions, no scopes, and for the right stone, an effective way to avoid a more invasive procedure. Texas Regional Urology's board-certified urologists perform lithotripsy with evaluation and follow-up at our offices in The Woodlands, Tomball, and Kingwood.
Breaking Stones From Outside
What Is Lithotripsy?
Extracorporeal means outside the body, and that is the defining feature. A machine generates focused shock waves that pass harmlessly through soft tissue and converge on the stone, where the concentrated energy cracks it apart. Imaging — X-ray or ultrasound — locates the stone precisely so the waves stay on target throughout the treatment.
Over the following days and weeks, the fragments pass out through the urinary tract in the urine. This is the part people underestimate: lithotripsy doesn't remove the stone, it converts one large problem into many small ones that your body clears on its own. That means passing fragments, and it means the result isn't immediate.
Whether ESWL is the right choice depends heavily on the specific stone. Size, location, and composition all matter — some stones are simply too hard to break with shock waves, and some sit where fragments would struggle to clear. Learn more about kidney stones.
Over the following days and weeks, the fragments pass out through the urinary tract in the urine. This is the part people underestimate: lithotripsy doesn't remove the stone, it converts one large problem into many small ones that your body clears on its own. That means passing fragments, and it means the result isn't immediate.
Whether ESWL is the right choice depends heavily on the specific stone. Size, location, and composition all matter — some stones are simply too hard to break with shock waves, and some sit where fragments would struggle to clear. Learn more about kidney stones.
Why It's Chosen
Benefits of Lithotripsy
No Incision, No Scope
Nothing enters the body. Among stone treatments, this is the least invasive option available.
Outpatient Procedure
Treatment takes about 45 minutes to an hour, and patients go home the same day.
Quick Return to Activity
Most people resume normal activity within one to two days.
No Stent in Many Cases
Depending on stone size and location, a ureteral stent may not be needed — an advantage, since stents are a common source of discomfort after stone procedures.
Well Established
ESWL has been used for decades, and both its benefits and its limitations are thoroughly documented.
Who Qualifies
Am I A Candidate?
Lithotripsy works best for stones under about 2 cm located in the kidney or upper ureter, and for stone compositions that fragment readily. Your urologist will assess the stone on CT, where its size, position, and density all inform whether shock waves will break it efficiently.
It is generally not suitable during pregnancy, for people with uncontrolled bleeding disorders or on blood thinners that can't be held, for uncorrected urinary obstruction below the stone, or when infection is present. Very hard stones — certain cystine and calcium oxalate monohydrate compositions — resist fragmentation and are better treated with ureteroscopy. Large stone burdens are usually better handled by other approaches. Body habitus can also affect whether the shock waves can be focused effectively.
It is generally not suitable during pregnancy, for people with uncontrolled bleeding disorders or on blood thinners that can't be held, for uncorrected urinary obstruction below the stone, or when infection is present. Very hard stones — certain cystine and calcium oxalate monohydrate compositions — resist fragmentation and are better treated with ureteroscopy. Large stone burdens are usually better handled by other approaches. Body habitus can also affect whether the shock waves can be focused effectively.
Recovery Time
What to Expect
Before the Procedure
You'll have imaging to locate and characterize the stone, a urine culture to confirm there's no active infection, and a medication review. Blood thinners must be stopped in advance, and you'll receive fasting instructions.
The Day of the Procedure
Treatment is performed under sedation or general anesthesia and takes roughly 45 minutes to an hour. You'll lie on a table while the stone is located with imaging and the shock waves are delivered. You won't feel the treatment itself.
The First Few Days
Expect blood in the urine, bruising or soreness over the treated area, and cramping or colicky pain as fragments begin to move. This pain can be significant when a fragment enters the ureter — it is expected, not a sign of failure. Drink plenty of fluids and strain your urine.
The Following Weeks
Fragments continue passing over days to weeks depending on stone size. We'll follow up with imaging to confirm clearance.
Analyzing the Stone
Strain your urine and bring in whatever you catch. Stone composition directly shapes your prevention plan, and this is the easiest opportunity to obtain it.
Risks & Side Effects
Side Effects
Pain From Passing Fragments
The most common complaint. Fragments moving through the ureter can cause colicky pain requiring medication.
Blood in the Urine
Expected for several days after treatment.
Steinstrasse
Fragments can occasionally line up and block the ureter — literally a "stone street" — sometimes requiring a stent or a further procedure.
Incomplete Fragmentation
Some stones don't break adequately, and a second lithotripsy session or a different procedure may be needed.
Bruising and Soreness
Skin bruising over the treatment area is common and resolves on its own.
Other Risks
Infection, kidney bruising or hematoma, and rarely effects on surrounding organs. Your urologist will review these in full.
Answers to your Lithotripsy Questions
Frequently Asked Questions
Not during — you'll be sedated.
The procedure itself is performed under sedation or anesthesia and isn't felt. Discomfort comes afterward, as fragments pass over the following days.
Days to several weeks.
Fragments clear gradually rather than all at once, and larger stones take longer. Follow-up imaging confirms when clearance is complete.
Sometimes, depending on stone size.
Smaller stones often need no stent, while larger ones may warrant one to keep the ureter open as fragments pass. Your urologist will decide before the procedure.
A second session or ureteroscopy follows.
Not every stone fragments adequately, particularly harder compositions. Ureteroscopy with laser is the usual next step and has a higher single-session clearance rate.
Less invasive, but less immediately definitive.
Lithotripsy involves nothing entering the body but relies on you passing fragments over time. Ureteroscopy removes the stone directly with a higher clearance rate, at the cost of a scope and usually a stent.
Yes — largely, with a proper plan.
Stone composition analysis and a 24-hour urine collection identify your specific risk factors, which guide fluid targets, dietary changes, and medication. This is what breaks the cycle rather than just treating the current stone.
Dealing with a kidney stone?
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