College of Osteopathic Medicine

MSUCOM

Principles of Manual Medicine
Pelvic Biomechanics

The pelvis makes a significant contribution to the functional capacity of the musculoskeletal system and warrants appropriate investigation and management in all patients. The superior surface of the body of the sacrum supports the vertebral column and the sacroiliac joints couple to the lower extremities. Consequently, alterations in normal sacral mechanics can have a significant effect on both body support and locomotion.

Diagnosis is performed with the patient standing, sitting, prone, and supine positions while the examiner looks for combinations of asymmetry, range of motion, and tissue texture abnormalities. The diagnostic process focuses upon identification of:

• dysfunction between the two pubic bones.
• dysfunction between the two innominates.
• dysfunction between each innominate and the sacrum.

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