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Updated: Jul 14, 2026

C-arm-Free Simultaneous OLIF51 and Percutaneous Pedicle Screw Fixation in a Single Lateral Position

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The Medstone fixed, mobile, and modular configurations: impact on efficacy.

Adam Nicholson¹, Courtney Lee, Roland Ugarte

¹Department of Urologic Surgery, University of Minnesota, Minneapolis, Minnesota 55455-0392, USA.

Journal of Endourology

|May 26, 2007

Summary

New configurations of the Medstone STS lithotripter, including mobile and operating-room units, show improved stone-free rates and efficiency compared to the original fixed machine. The modular operating-room unit (STS-T) demonstrated the highest efficiency quotient.

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Area of Science:

Urology
Medical Devices
Nephrology

Background:

Extracorporeal shock wave lithotripsy (ESWL) is a common treatment for kidney stones.
The Medstone STS lithotripter has undergone several configuration changes.
Evaluating the efficacy of different lithotripter configurations is crucial for optimizing patient outcomes.

Purpose of the Study:

To compare the efficacy of three Medstone STS lithotripter configurations: fixed-site (STS-FIX), mobile (STS-MOB), and operating-room (STS-T).
To assess stone-free rates, need for auxiliary procedures, re-treatment rates, and calculate an efficiency quotient (EQ) for each configuration.

Main Methods:

A retrospective analysis of 13,131 patients treated between 1999 and 2002.
Patients were treated with STS-FIX (52%), STS-MOB (26%), or STS-T (22%) units.
Follow-up included plain abdominal radiography to determine stone-free status and assess need for further interventions.

Main Results:

Overall stone-free rates were 59% (STS-FIX), 62% (STS-MOB), and 65% (STS-T).
The STS-FIX showed lower efficacy for lower-pole stones and larger stone sizes (21-30 mm) but higher efficacy for middle ureteral stones.
The STS-T achieved the highest overall efficiency quotient (59), followed by STS-MOB (56) and STS-FIX (50).

Conclusions:

New configurations of the STS lithotripter significantly improve efficacy over the original fixed unit.
The modular operating-room configuration (STS-T) offers the highest efficiency, potentially due to real-time fluoroscopy.
Configuration choice impacts treatment outcomes and efficiency in SWL procedures.