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

The PediGuard® devices with DSG Technology have assisted orthopedic spine surgeons and neurosurgeons in over 47,000 surgeries worldwide – ask your surgeon about the DSG Technology.

  • 98% breach detection (Bolger 2007)
  • 100% pedicle breach anticipation and 87% breach anticipation overall (Williams 2014)
  • 97% screw placement accuracy (Defino 2015, Heimen 2014, Bai 2013, Chaput  2012,  Chang 2009, Bocquet  2006)
  • 3 times fewer pedicle perforations than with free-hand technique (Bai 2013)
  • 3-fold reduction in neuro-monitoring alarms (Ovadia 2011); 25% – 54% reduction in radiation exposure during pedicle screw placement (Chaput 2012, Bai 2013)
  • 15% saving in operative time during screw placement (Bai 2013)

Average Rates of Properly Placed Screws

PediGuard's Superiority in Accuracy of Screw Placement

PediGuard has assisted orthopedic spine surgeons and neurosurgeons all over the world in the placement of over 300,000 screws in over 55,000 surgical procedures.

Our complete bibliography is available here.