Ch. 4.4: Complexes Interlock

Within a plane and between planes, the complexes that make up our body interlock like the gears of an intricate mechanical watch, forming reciprocal relationships.

Written by

Willem Kramer

Published on

July 20, 2025

Within a plane and between planes, the complexes that form our body interlock, like the gears of an intricate mechanical watch.

Their interlocking makes it so that complexes employ, move, and affect each other. In research, this is referred to as a “reciprocal relationship.”

"Shin (2024), Ruiz (2020), Edmonston (1997), and Sueki (2013) all recognize, what they call, “the reciprocal relationships” between the pelvic area, lumbar, thoracic, and cervical spines. Through their relationships, the mentioned areas affect each other in positive and negative ways."

The left frontal hip (F5), for example, interlocks with the left frontal sacroiliac, the frontal pubic symphysis, and, via the left frontal knee, with the left frontal ankle.

Practically, this means that the left frontal hip recruits and alters the left frontal sacroiliac, the frontal pubic symphysis, knee, and ankle …, and the other way around.

The “other way around” indicates the reciprocal nature of the relationships. In case you do not know the word reciprocal, it means “give-and-take.”

Reciprocal relationships between complexes range from “significant” to “not that significant”; some inter-complex relationships have a noticeable impact, while others do not.

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Author

Willem Kramer is a Dutch-educated physiotherapist and US-licensed massage therapist with over thirty years of experience working with professional athletes, entertainers, and executives worldwide. He reorganizes anatomy around how the body moves, working from the premise that motion is a whole-body event involving all twelve organ systems within the anatomical planes of motion. He is the author of Anatomy by Planes — a three-atlas set with a foreword by Andrew Luck — and its companion Clinical & Training Guide, and the creator of Motion Anatomy (motionanatomy.com), a free introduction to the framework.

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