A stepper-guided biopsy procedure is a transperineal prostate biopsy technique that uses a stepper stabiliser, ultrasound probe, and brachy grid to accurately guide biopsy needles through the perineum into the prostate. This approach offers precise sampling, excellent reproducibility, and supports systematic as well as targeted biopsies while reducing the risk of infection associated with transrectal biopsy.
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What is Stepper Guided Procedure?
A stepper-guided procedure is a method of performing a transperineal prostate biopsy using a smart stepper stabiliser and a brachytherapy grid attached to an ultrasound probe. It is also known as fixed-angle transperineal biopsy
Unlike freehand techniques, the probe is fixed within the stepper, allowing the clinician to move it in precise increments and position biopsy needles through predetermined grid coordinates. This makes sampling more systematic and reproducible, especially when numerous biopsy cores or targeted samples are required.
Today, stepper-guided systems continue to be widely used in many centres performing template biopsies, brachytherapy, focal therapy, and MRI-targeted prostate biopsies because they provide excellent control over needle placement.
A complete fixed-angle transperineal biopsy procedure setup generally includes:
- Smart stepper stabiliser
- Ultrasound machine with probe
- Disposable Brachy Grid
- Brachy Balloon
- Ultrasound Gel
- Spinal needle with local anaesthetic
- Prostate Biopsy Gun
- Tissue cassettes
Each component has a specific role in ensuring the biopsy is both accurate and reproducible.
Why are Stepper Guided Procedures used?
The main objective of the procedure is to obtain accurate tissue samples from the prostate while minimising unnecessary risk.
Apart from accurate tissue samples, the stepper system provides several other advantages:
- Stable ultrasound imaging
- Precise probe movement
- Repeatable needle positioning
- Consistent biopsy mapping
- Better access to the anterior prostate
- Accurate documentation of biopsy locations
This precision becomes especially valuable in patients with:
- Elevated PSA
- Suspicious MRI lesions
- Previous negative biopsy
- Active surveillance
- Need for template mapping biopsy
Recent international consensus statements increasingly support wider adoption of transperineal biopsy because of its diagnostic performance and lower infection rates compared with traditional transrectal biopsy.
Stepper-Guided Transperineal Prostate Biopsy Procedure
The following workflow reflects a typical stepper-guided transperineal biopsy procedure using a stabiliser system and biopsy kit.
Step 1: Patient Preparation
The patient is positioned in the lithotomy position, providing clear access to the perineal region. The perineal skin is cleaned using sterile preparation techniques before beginning the procedure.
Step 2: Ultrasound Probe Preparation
Ultrasound gel is applied to the probe. A Brachy Balloon is then fitted over the ultrasound probe. The balloon is filled with sterile or saline water according to the manufacturer’s instructions.
The balloon improves acoustic coupling while helping protect the probe during insertion.
Step 3: Mount the Stepper and Brachy Grid
The ultrasound probe is secured firmly within the stepper stabiliser. Next, the brachy grid is attached to the stepper. Proper alignment is important because the grid must remain axially aligned with the ultrasound probe, allowing every biopsy coordinate to correspond accurately with the ultrasound image.
Step 4: Open the Biopsy Box
Organising the equipment beforehand improves procedural efficiency. Global Prostate Solutions’ sterile prostate biopsy box, with all consumables, should be ready before the procedure. The box typically includes:
- Prostate Biopsy gun
- Syringe prefilled with Ultrasound Gel
- Spinal needle
- Brachy Grid
- Brachy Balloon
Step 5: Local Anaesthesia
Using a spinal needle, local anaesthetic is infiltrated into the perineal skin. Most clinicians allow 5–10 minutes for the anaesthetic to take full effect before proceeding. Adequate anaesthesia improves patient comfort throughout the biopsy.
Step 6: Access the Target Area
Instead of manually moving the probe, the clinician advances and retracts it using the stepper mechanism in controlled increments. The probe can also be rotated when necessary, providing optimal visualisation of suspicious lesions and improving needle targeting.
Step 7: Plan the Biopsy Targets
The prostate is examined using the advanced prostate ultrasound. If MRI images are available, targeted lesions may also be incorporated into the biopsy plan. In this stage, the clinician identifies:
- Systematic biopsy zones
- MRI-visible lesions
- Suspicious regions
- Areas requiring additional sampling
Step 8: Needle Placement
The prostate biopsy gun is advanced through the selected brachy grid coordinate. Each hole marked in the disposable grid represents a known position, and needle placement becomes highly reproducible. This is one of the advantages of template-guided biopsy.
Step 9: Tissue Sampling
The biopsy gun is loaded. Once the needle reaches the desired position, the biopsy gun is fired to obtain the tissue core. Each specimen is immediately placed into its corresponding labelled tissue cassette for pathological examination.
Step 10: Repeat Sampling
The clinician adjusts the stepper position as required. Multiple systematic or targeted cores are obtained through different grid coordinates until the planned sampling protocol has been completed.
How does the Stepper improve accuracy?
Unlike other biopsy techniques, the stepper stabilises both the ultrasound probe and needle trajectory. Because the probe moves in measured increments, clinicians can revisit exact anatomical locations if repeat sampling becomes necessary. This offers several benefits:
- Consistent probe position
- Controlled probe advancement
- Reduced operator variability
- Accurate biopsy mapping
- Repeatable targeting
- Better documentation for future biopsies
Conclusion
A fixed-angle transperineal biopsy procedure remains one of the most precise methods for performing template-guided transperineal prostate biopsy. By combining a stabilised ultrasound probe, a brachy grid, and controlled probe movement, clinicians can achieve reproducible needle placement and comprehensive sampling of the prostate.
As transperineal biopsy continues to gain wider acceptance because of its favourable safety profile and diagnostic performance, stepper-guided systems continue to play an important role in centres performing systematic, template, and targeted prostate biopsies.
While the specific workflow may vary between institutions, the principles remain the same: stable imaging, accurate targeting, and consistent tissue sampling to support informed clinical decision-making. Explore a safer and more precise approach to prostate biopsy with expert guidance.
FAQs
Is a stepper-guided procedure the same as a transperineal biopsy?
No, a fixed-angle transperineal biopsy procedure is one method of performing a transperineal prostate biopsy. Other approaches include freehand and coaxial techniques.
Is a stepper-guided biopsy procedure always used?
No, some clinicians prefer freehand systems, while others use a stepper and brachy grid depending on the procedure and available equipment.
Why is a brachy grid used in the procedure?
The grid provides fixed coordinates that guide needle placement with greater precision and repeatability.
Does the stepper improve cancer detection?
The stepper itself does not detect cancer. Its role is to improve needle placement accuracy and consistency, which supports systematic sampling and targeted biopsies.
