The Performance Matrix

Measuring core control with the PBU part 2

16th October 2012

LEVEL 2: Single Leg Extension

Lie on the back, legs bent with knees and feet together

Place Pressure Biofeedback Unit (PBU) under the lumbar lordosis. Pelvis relaxed and neutral

  • Inflate the PBUs to 40 mmHg to maintain the neutral pelvic tilt and neutral low back
  • Monitor the position of the pelvis with hands
  • Demonstrate that tilting the pelvis forwards and arching the back results in a decrease in pressure (extension)
  • Demonstrate that rolling the pelvis backwards and rounding the back results in an increase in pressure (flexion)
  • Demonstrate that twisting the pelvis into rotation results in an increase in pressure on one PBU or a decrease in pressure on the other PBU. The pelvic rotation can also be felt by the hands or visually observed
  • Keeping the pelvis from moving, slowly lift both feet off the floor until the thighs are vertical (hip flexion to 90 degrees) and both feet are off the floor Figure 5

Figure 5


  • Ensure that the PBU keeps a constant pressure of 40 mmHg Keeping the pelvis from moving, and keeping both feet off the floor, slowly lower one foot until it is just clear of the floor (1-2 cm) Keeping that foot just above the floor, slowly straighten the leg to the fully extended (horizontal) position and heel touch and return Figure 6 & 7

Figure 6 Figure 7

  • Try to keep the pressure of both PBUs at 40 mmHg.  A pressure increase of 5 mmHg (45 or above)  indicates uncontrolled flexion A pressure decrease of 5 mmHg (35 or below)  indicates uncontrolled extension.Observe or palpate for uncontrolled rotation.

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