The Performance Matrix

Measuring core control with the PBU part 3

16th October 2012

See Level 1 and Level 2


LEVEL 3: Double Leg Extension

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

Place a Pressure Biofeedback Unit (PBU) under the lumbar lordosis

Pelvis relaxed and neutral

  • Inflate the PBU 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)
  • 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 Ensure that the PBU pressure is at 40 mmHg
  • Keeping the pelvis from moving, and keeping both feet off the floor, slowly lower both feet until they are just clear of the floor (1-2 cm)
  • Keeping both feet just above the floor, slowly straighten the legs to the fully extended (horizontal) position and touch both heels to the floor and return Try to keep the PBU pressure 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 A pressure change of less than 5 mmHg is acceptable while the legs are moving only if the trunk can be re-stabilised at 40 mmHg when the legs stop moving at the heel touch point Figure 8 & 9

Figure 8

Figure 9

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