An angled joint at C6-C7 turns one shear force into compression plus a small upward lift
Eileen Durfee's Spinal Fitness book names 3 forces that hold the head up at the C6-C7 joint and shows how the angle of the facet joints splits force into 2 components: one that stabilizes the joint and one that lifts the vertebra slightly off the disc. The book calls that lift the floating mechanism and states that it helps the cervical disc receive alternating compression and decompression during normal head and neck movement.
The Spinal Fitness book analyzes the cervical spine at the C6-C7 joint, where 3 forces interact simultaneously to keep the head stable. The first is skull load: the weight of the head on the neck creates a forward-directed torque that tends to rotate C6 forward on C7, and when the head shifts forward the resistance arm lengthens and that torque increases. The second is interspinalis muscle force: the posterior cervical stabilizers, including the interspinalis muscles, create a posterior stabilizing pull, and the book notes that this pull has a direction and an angle and also contributes force at the facet joint. The third is facet orientation: the book states that the angle of the facet joints determines how force is split and directed.
The book's sentence for the first force, in Chapter 4, is that the head did not become heavier; the leverage changed. Effective head load at each head position is covered in neck load by head position and the Neck Flexion nod. The equipment the book uses for the neck is part of the Creatrix spine alignment stretches and exercises collection.
The book orders the 3 equilibrium problems of a spinal joint: torque first, translation second, shear third. At C6-C7, torque is the forward rotation of C6 on C7, which the interspinalis and related posterior stabilizer muscles oppose. Translation is sliding: when cervical lordosis is intact and the head is balanced over the center of gravity, the resultant force at C6-C7 is directed predominantly into joint compression. When the curve is lost, the head shifts forward of the vertical axis, the resultant develops an anterior component, and C6 tends to slide forward on C7. The book classifies that slide as a mechanical consequence of misalignment, not a failure of muscle strength.
Shear is the third problem, and in a lordotic neck bone handles most of it. When C6 attempts to translate anteriorly, its inferior facets are contacted and blocked by the superior facets of C7, and the book states that much of this stabilization can happen passively through the bony architecture of the joint. When the curve is lost, the facets are no longer in position to intercept the anterior resultant force; the disc, which the book describes as never designed to resist sustained horizontal shear, may become a primary structure absorbing the translational load while ligaments are strained and muscles co-contract.
The book's facet illustration labels an approximate facet angle of 35 degrees between the joint plane and the C6-C7 endplate line. A shear force from muscle pull enters that angled joint surface, and because the surface is angled rather than vertical, the book states, the force splits into 2 components. The first component is compressive: it is directed into the facet joint surface for stability and presses the inferior facet of C6 against C7, which helps keep the vertebra from sliding forward. The second component is an upward shear vector: part of the applied force is redirected upward along the joint plane, partially counteracting the downward weight of gravity and creating a subtle lifting effect.
The Chapter 4 comparison case is a facet at a perfect 90-degree angle to the vertebral endplates, perfectly vertical and flat. A facet in that position would resist shear directly, every force pressing C6 against C7 would be absorbed into the joint surfaces, and the disc would sit under constant compression. The book states that this is what happens mechanically in a military-straight neck or a cervical spine that has lost its lordotic curve: the lift disappears, the bones compress fully, and the disc loses the alternating motion it needs.
The body text of the book describes the healthy facets as angled and gives no degree figure; the 35-degree value appears on the illustration. The book gives no measured facet angle for any other level of the neck.
Chapter 4 defines the floating mechanism as the subtle lifting effect created when the cervical curve, muscle force and facet orientation work together correctly. In lordotic alignment, part of the force stabilizes the joint and part creates a small upward component that partially unloads the disc. The book sets the limit of the term itself: the vertebra is not floating in the air; the joint is not simply being crushed downward all day, and the mechanics allow a subtle rhythm of compression and decompression at the joint.
After early adulthood, the book states, discs rely heavily on mechanical motion to circulate nutrients inward and remove metabolic waste outward, a process it calls essentially osmotic: compression squeezes fluid out of the disc, and decompression draws fresh fluid back in. A cervical spine with healthy lordosis maintains this pumping action through small movements of the head and neck throughout the day, so the nucleus pulposus stays hydrated, nutrients reach its inner cells and waste products are cleared.
Chapter 4 lists 8 changes when cervical lordosis is lost: the anterior shear mechanism diminishes, the facets lose their protective angle, upward shear or lift is reduced, C6 presses downward onto C7, the disc is subjected to more constant compression, pumping action is reduced, nutrient exchange decreases, and degenerative conditions can progress. Its next sentence is that this disc change is not merely aging but a predictable biological consequence of a specific mechanical failure. Without the periodic relief that drives fluid exchange, the book states, the nucleus pulposus loses hydration over time, disc height decreases, and the mechanical properties of the fibrocartilage degrade.
A straight neck does not keep the mechanism. In the book's comparison, a lordotic neck balances the head over the body, lets the posterior muscles work with less constant strain and lets the facets split force, while in a straight or military neck the facet angle no longer creates the same upward component and the disc may experience more constant compression. The book's rule for the cervical spine is that the goal is proper curvature, and that a spine can be straight and still mechanically disadvantaged.
Step 4 of the book's 5-step system is Neck Flexion, which the book states restores cervical curve and reduces whole-spine compensation from forward head posture. The motion is a single smooth nod of the neck around the mid-cervical hinge near C5 against light resistance. Method A uses the fingertips on the sinus and upper cheek region; Method B uses the Neck Shaper, which the book states provides consistent resistance and positioning once the pattern is established with bare hands, with the same nod mechanics, frequency and progression. The beginner dose is 6 repetitions per session, 6 sessions per day, with strain and no pain, and when 6 reps no longer create muscular strain the book progresses to 10 reps per session. Advanced daily maintenance is 6 to 10 reps every hour, only if symptom-free, and the athletic progression builds toward 15 to 20 reps per session. The book's clock-face cue for the nod: the nose starts at 12 o'clock looking up and travels forward and down to about 3 o'clock to 3:30, then the hands push the head straight back over the trunk. The Chapter 11 Desk Standard spreads Neck Flexion across a workday: a 2 to 4 minute prime of 6 reps, by hand or with the Neck Shaper, at the start of the day; micro-breaks of 10 to 30 seconds every 45 to 60 minutes with 2 to 3 Neck Flexion reps; and a 15 to 20 minute decompression at home at the end of the shift, 25 Spinal Twist reps followed by Neck and Back Shaper roll rest.
Step 5 ends the day on the rolls: 25 seated Spinal Twist reps, then supported rest over the Neck and Back Shaper rolls for 18 to 20 minutes, no longer. The Neck Shaper rolls are 7 inches long, the roll diameters are 2.75, 3.0, 3.25, 3.5 and 3.75 inches, and each roll has a center groove so the spinous processes can float rather than being pressed into the support. The book's selection rule is that a flatter or stiffer spine typically starts better with a smaller diameter and softer density, with progression in the order time tolerance, then diameter, then density. The book gives no rule matching a roll diameter to a facet angle or to a specific vertebral level.
The book's caution for Neck Flexion: you should feel muscular strain, but not pain, and pain, numbness, tingling, dizziness, visual changes or headache spikes are stop-signs that call for reduced intensity and appropriate medical evaluation. Beginners may move only an inch or two at first, and the instruction is never to force range of motion or shove the face and neck forward.
Chapter 11 sets these stop signs for every exercise in the system: new numbness or tingling, radiating symptoms, weakness, bowel or bladder changes, or sharp escalating pain. When any of them appears, the instruction is to pause training and escalate to medical evaluation.
The Neck Shaper Kit is the neck flexion trainer for Method B; the Neck Shaper roll set covers the supported rest in soft, medium and hard.
Practitioner Eileen Durfee, NBS (Nutritional Balancing Science), NASM-CPT — wellness educator, inventor, author, and a Nationally Certified Spinal Fitness Specialist.
From Chapter 4 of my book: "Spinal Fitness starts with structure because structure changes the force environment."
The chapter's Mainstream Translation for the reader: "Your neck curve is not cosmetic. It helps your discs breathe." For the clinician or trainer: "Symptoms may calm down before the force environment is corrected. Restore the curve, not just the comfort level."
Our Facebook group is free to join for questions about any of the 5 steps in the Spinal Fitness system.
The book defines it as the subtle lifting effect created when the cervical curve, muscle force and facet orientation work together correctly. The upward component partially unloads the disc, so normal head movement gives it alternating compression and decompression.
From the book's facet illustration, which labels an approximate facet angle of 35 degrees at C6-C7. The body text describes the healthy facets as angled and gives no number.
The book states that in a straight or military neck the facet angle no longer creates the same beneficial upward component and the disc may experience more constant compression. Its goal is proper curvature.
The Neck Shaper for Neck Flexion (Step 4, Method B) and the 7-inch Neck Shaper rolls for the 18 to 20 minute supported rest after the Spinal Twist (Step 5).
6 repetitions per session, 6 sessions per day, with strain and no pain. When 6 reps no longer create muscular strain, the book moves to 10 reps per session.
Published October 9, 2026 • Updated October 9, 2026
By Eileen Durfee, Nationally Certified Spinal Fitness Specialist, NASM-CPT, and author of the Spinal Fitness book.
More from Eileen Durfee
Eileen's free guide, Is Your Posture Aging You?, on EileenDurfee.com
This article is for educational purposes only. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. Nuco Enterprise Solutions LLC.
