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to the CTSIB test. Only patients without motor problems should be tested with the CTSIB. The
Limits of Stability test is an effective test to ease out this question
!
Note: Log transformation is applied to the patient score as well as to the normative data (see
the section on Log Transformation for more information).
BESS test data interpretation
Sway index and conditions are the same as CSTIB. The inclusion of error scoring is additional.
Limit of Stability Test Data Interpretation
This test is a good indicator of dynamic control within a normalized sway envelope. Poor
control, inconsistent, or increased times suggests further assessment for lower extremity
strength, proprioception, vestibular, or visual deficiencies.
The patient’s Limits of Stability is measured as the ‘how far from the center’ the patient can
sway. This sway Angle (°) is illustrated on the display screen.
Figure B.2. Limit of Stability Test Data from Report.
Note: Refer to Appendix A for the definition of Sway Angle listed as Angle (°).
% of Standard: The score relative to the standardize sway envelope; 8 degrees to side, 8
degrees forward, and 4 degree backwards.
Composite Score: The average of all the eight targets for a Full pattern. For a Left or Right
pattern, it will be five targets.
!!"#$"%&'(!!"#$% !
!
!
!"##
!
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Where: ! = Number of Targets.
Postural Stability Test Data Interpretation
The Postural Stability test emphasizes a patient’s ability to maintain a center of balance. The
patient’s score or Stability Index on this test assesses deviations from the center; thus a lower
score is more desirable than a higher score. The stability index does not indicate how much the
patient swayed; only the position.
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