Validity and Reliability of SOT Categorization for Postural Sway

A Brief Review of Brauner, Humphreys & Warren (AECC, 2001)

In 2001, a student research project at the Anglo-European College of Chiropractic (AECC) explored a clinically important question:

Is Sacro Occipital Technique (SOT) categorization valid and reliable when evaluated against postural sway?

The study — Brauner S (student), Humphreys K (tutor), Warren M (tutor). Validity and reliability of SOT categorization for postural sway. AECC Project List, 2001 — investigated whether SOT categories correspond to measurable differences in balance control.

Sacro Occipital Technique (SOT), developed by Major Bertrand DeJarnette, classifies patients into three primary categories (I, II, III) based on sacral, pelvic, and dural indicators (DeJarnette, 1979). These categories are intended to reflect differing biomechanical and neurological patterns.

If SOT categorization reflects meaningful neuromechanical differences, it would be reasonable to expect measurable differences in postural control.

Postural sway refers to the small, continuous movements of the body while standing. It is commonly measured using force platforms that track center-of-pressure (COP) displacement.

Research shows that postural sway reflects integration between:

• Proprioceptive input

• Vestibular function

• Visual feedback

• Central nervous system processing

(Prieto et al., 1996; Ruhe et al., 2010)

If SOT categories represent distinct neurological or structural states, differences in sway amplitude or pattern might be observable.

Validity and Reliability: Why They Matter

Two major research concepts are central to this study:

• Reliability – Do examiners consistently assign the same SOT category?

• Validity – Does SOT categorization correspond to objective measures such as postural sway?

Reliability in manual assessment procedures has historically shown variability depending on examiner training and standardization (Cooperstein & Gleberzon, 2004). Therefore, examining SOT categorization against objective balance measures represents an important step toward evidence-informed evaluation.

Clinical Significance

If the study demonstrated:

• Strong reliability, it would support consistency in SOT diagnostic procedures.

• Correlation with postural sway, it would suggest neurological or biomechanical differentiation between categories.

If correlation was weak, this could indicate:

• Postural sway reflects global compensation rather than specific pelvic categorization.

• SOT categories may represent functional patterns not directly captured by static balance testing.

• Additional outcome measures may be required to evaluate category differences.

Either outcome contributes meaningfully to refining diagnostic interpretation.

Broader Context

Modern research emphasizes that posture and balance are dynamic, multifactorial processes (Lederman, 2011). While structural models suggest biomechanical causation, balance control depends on complex sensorimotor integration.

Studies of postural control highlight that small differences in sway may not always correspond directly to localized structural findings (Ruhe et al., 2010).

Therefore, research like Brauner et al. (2001) plays an important role in examining how traditional chiropractic categorization aligns with measurable physiological function.

Validity and Reliability of SOT Categorization for Postural Sway: Conclusion

The 2001 AECC project by Brauner, Humphreys, and Warren represents an important effort to evaluate the validity and reliability of SOT categorization using objective postural sway measures.

Whether strong associations were found or not, this type of inquiry helps move clinical systems from tradition-based frameworks toward testable models grounded in measurable outcomes.

For clinicians utilizing SOT, the key takeaway is clear:

Diagnostic systems benefit from continual validation against objective functional measures.

References

Brauner S, Humphreys K, Warren M. Validity and reliability of SOT categorization for postural sway. AECC Project List; 2001. (Unpublished student research project.)

Cooperstein R, Gleberzon B. Technique systems in chiropractic. J Can Chiropr Assoc. 2004;48(2):101–111.

DeJarnette MB. Sacro Occipital Technique Manual. Nebraska City, NE: DeJarnette Publishing; 1979.

Lederman E. The fall of the postural-structural-biomechanical model in manual and physical therapies. J Bodyw Mov Ther. 2011;15(2):131–138.

Prieto TE, Myklebust JB, Hoffmann RG, Lovett EG, Myklebust BM. Measures of postural steadiness: Differences between healthy young and elderly adults. IEEE Trans Biomed Eng. 1996;43(9):956–966.

Ruhe A, Fejer R, Walker B. The test–retest reliability of centre of pressure measures in bipedal static task conditions. Gait Posture. 2010;32(4):436–445.

Brauner S, (student), Humphreys K., (tutor), Warren M., (tutor).  Validity and reliability of SOT categorization for postural sway, AECC Project List 2001

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