A sacral dysfunction that is a unilateral shear is categorized as physiological or non-physiological?

A sacral dysfunction that is a unilateral shear is categorized as physiological or non-physiological?

• A. Physiological
• B. Non-physiological
• C. Unknown
• D. Both

Answer: (B)

Unilateral sacral shear is non-physiological because it represents an abnormal, asymmetric motion between the two halves of the sacrum. Normal sacral motion occurs in coordinated, symmetrical patterns (like those tied to respiration or typical sacral torsions) and preserves balance with the ilia. A unilateral shear disrupts this symmetry and indicates a dysfunction beyond the normal physiologic range, usually arising from trauma or focal joint dysfunction. Therefore, it falls into the non-physiological category.

Unilateral sacral shear is non-physiological because it represents an abnormal, asymmetric motion between the two halves of the sacrum. Normal sacral motion occurs in coordinated, symmetrical patterns (like those tied to respiration or typical sacral torsions) and preserves balance with the ilia. A unilateral shear disrupts this symmetry and indicates a dysfunction beyond the normal physiologic range, usually arising from trauma or focal joint dysfunction. Therefore, it falls into the non-physiological category.