DSG® Technology Benefits


The DSG® (Dynamic Surgical Guidance) Technology is based on the principle that the electrical conductivity of tissue varies by the type of tissue. Electrical conductivity is the property of a material to conduct an electrical current. E.g.,:

  • Cortical bone has low conductivity
  • Cancellous bone has medium conductivity
  • Periosteum and blood have high conductivity

This parameter, varying conductivity, can be very helpful in differentiating between various tissue types while drilling a pedicle prior to screw placement.

All PediGuard® Probes have the DSG® Technology built into them.  So, by using the PediGuard® Probes to prepare the pedicles in the spine (prior to implant placement), all inherent benefits of the DSG® Technology are realized.


How does the PediGuard® Probe work?

A bipolar sensor is embedded at the tip of each PediGuard® probe. A low frequency and low voltage current is pulsed through an electrode in the probe. Based on the local conductivity, the sensor can accurately inform the surgeon of the type of tissue the tip is in. This in turn can alert the surgeon prior to a cortical breach during pedicle preparation. The surgeon is informed in real time of the tissue type by changes in the pitch and cadence of an audio signal and a flashing LED light.

All PediGuard® probes have been programmed such that they will emit an audio signal of:

  • Low pitch at a slow cadence in cortical bone
  • Medium pitch at a medium cadence in cancellous bone
  • High pitch at a fast cadence in periosteum and blood

Principle of DSG Technology

PediGuard® Probes do not use any ionizing radiation. So, the patient, the surgeon and hospital staff are all preemptively protected from any exposure to such potentially dangerous radiation. Also, PediGuard® Probes provide real-time feedback that does not depend on or require any pre-operative imaging.

Clinical Evidence:

The benefits of the DSG® Technology have been demonstrated in a wide number of clinical studies.

The PediGuard® devices enhance spinal fusion surgery, improves surgical workflow and maximizes screw placement efficiency by:

  • Increasing screw placement accuracy, therefore minimizing immediate and late complications related to screw misplacement
  • Reducing the use of X-ray imaging controls thus decreasing exposure to ionizing radiation, that could be dangerous especially for young patients

Average Rates of Properly Placed Screws

PediGuard's Superiority in Accuracy of Screw Placement

Screw placement accuracy and breach detection

  • 97% screw placement accuracy (Bocquet 2005, Lubansu 2008, Chang 2009, Chaput 2011, Bai 2012, Suess 2016)
  • 98% breach detection, twice better than conventional technique (Bolger 2007)
  • 100% medial pedicle breach anticipation (Williams 2014)
  • 92.5% complex deformity, accuracy upper thoracic (Allaoui 2018)
  • 3-times less neuro-monitoring alarms (Ovadia 2011)

Radiation safety and surgical efficiency

  • 73% reduction of X-Ray time in MIS (Lubansu 2011)
  • 30% reduction of X-Ray shots in open surgery (Chaput 2011, Bai 2012)
  • 15% surgical time savings during screw placement (Bai 2012)

Surgical education

  • 58% breach rate reduction among residents (Syed 2014)

New applications and techniques

  • 91% cervical spine lateral mass and pedicle screw placement accuracy (Darden 2016, Koller 2018)
  • New technique with Sacro-Iliac fusion (Sandhu 2014)

The PediGuard® devices have assisted orthopedic spine surgeons and neurosurgeons all over the world in the placement of over 345,000 screws in over 69,000 surgical procedures – ask your surgeon about the DSG® Technology.

Our complete bibliography is available here.