Consequences
When back pain starts in the foot
Unexplained chronic low back pain can have an unexpected origin: the big toe. FHL disrupts posture, tilts the pelvis forward and imposes on the back a constant effort of compensation. This is what Howard Dananberg documented as early as 1993 in two foundational articles.
The cascade to the back
The back has, at first glance, nothing to do with the foot. Yet, in the great majority of unexplained chronic low back pain cases, examination finds a Functional Hallux Limitus. The cascade is mechanical, predictable and documented for more than thirty years.
The biomechanical chain involved
The mechanism: a permanent forward posture
FHL blocks the roll-through of the step in the sagittal plane. When the foot can no longer propel correctly, the flexion moment increases at the hip and the knee, which leads to a forward tilt of the pelvis, what English speakers call anterior pelvic tilt. This tilt projects the entire upper body forward.
To avoid falling, the lumbar muscles (the erector spinae) must provide a constant straightening effort. This effort, imperceptible at first, becomes a chronic contracture over the years. The lumbar lordosis increases, the lumbar segment stiffens, and the thoracolumbar junction becomes a point of constant tension.
The teaching analogy
Imagine walking in diving fins
The longer the foot, the greater the lever arm, and the more the pelvis must tilt forward for the step to unfold. FHL acts like an invisible extension of the foot, forcing the entire upper body to lean forward permanently. This image, simple but accurate, makes it possible to understand in a few seconds why the back ends up suffering.
The areas of the back in distress
The pelvic tilt is not limited to the lower back. The compensation rises through successive levels, each vertebral segment seeking to correct the level below. Three areas account for the majority of complaints.
The lumbar region — the first area affected. The accentuated lordosis and the contracture of the iliopsoas stiffen the lumbar segment. The pain is postural, present from the morning, aggravated by prolonged standing and by walking, relieved by rest in flexion (the hunter’s position). This is the classic signature of chronic postural low back pain.
The thoracolumbar junction — the pivot point. Above the overloaded lumbar area, the junction between the last thoracic vertebra and the first lumbar vertebra becomes a point of tension. On examination, a trigger point is frequently found, a localized contracture associated with limited trunk rotation. The blockage is often unilateral, on the side of the dominant FHL or on the side of preferential lateralization (right-handed or left-handed).
The cervical region — the ultimate compensation. The leg-length discrepancy created by FHL leads to a compensatory scoliotic posture. To keep the gaze horizontal, the body adjusts at the last compensatory level, the second cervical vertebra (C2). A dysfunction of this vertebra is a frequent source of headaches and limited cervical rotation.
Why your back resists the usual treatments
If you are reading this page, it is probably because you have already tried several things. Manipulations, physiotherapy focused on the back, anti-inflammatories, injections, core-strengthening exercises. The pain comes back. Here is why.
Failure 1
The pain is treated, not the cause
- FHL is not identified
- The pelvis keeps tilting forward
- The benefits evaporate within a few weeks
Failure 2
The tests show nothing
- Normal X-ray, MRI, CT scan
- Low back pain labeled non-specific
- 90% of cases according to the literature
Failure 3
The foot is not examined
- The clinician looks at the back
- The foot stays in the shoe
- The FHL stretch test is not performed
Failure 4
Core strengthening alone is not enough
- It helps, but it compensates for a permanent imbalance
- Without correction of the foot, the effort remains constant
- It eventually exhausts the muscles
Key takeaway
Unexplained chronic low back pain that worsens with walking and running, and that resists the usual treatments, should raise the suspicion of a dysfunction of the big toe. This is one of the key messages of the Centre du pied for twenty-five years.
The foundational articles of Howard Dananberg
The link between FHL and chronic postural pain was first described systematically by Howard Dananberg, an American podiatrist, in two articles published in 1993 in the Journal of the American Podiatric Medical Association. These two publications remain the foundational references on the subject.
Foundational article
Functional Hallux Limitus — part 1
Dananberg HJ, 1993, Gait style as an etiology to chronic postural pain, part 1, Functional Hallux Limitus. Journal of the American Podiatric Medical Association, vol. 83, p. 433.
Foundational article
Postural compensatory process — part 2
Dananberg HJ, 1993, Gait style as an etiology to chronic postural pain, part 2, Postural compensatory process. Journal of the American Podiatric Medical Association, vol. 83, p. 615.
« Unexplained chronic low back pain that worsens with walking and running should raise the suspicion of a dysfunction of the big toe. It is this mental shift that changes the diagnosis. »
Dr Jacques Vallotton, Centre Orthopédique d’Ouchy
How FHL-related back pain is treated
Management does not consist of treating the back in isolation. It attacks the cause at the foot, releases the associated blockages, and re-harmonizes the muscle chains. Three complementary approaches.
Approach 1
Release the tendon
- The vacuum-cleaner cord maneuver on the subtalar joint
- FHL stretching exercises
- Physiotherapy or osteopathy familiar with the technique
Approach 2
Release the associated blockages
- Sacroiliac osteopathic manipulations
- Thoracolumbar junction and C2
- Treatment of muscle trigger points
Approach 3
Re-harmonize the posture
- Abdomino-lumbo-pelvic core strengthening
- Foot core
- Dynamic foot orthoses
Important
FHL surgery (arthroscopic tenolysis) may be indicated for chronic lumbopelvic pain resistant to conservative treatment, when the role of FHL has been clearly documented. This is an indication validated by twenty-five years of practice at the Centre Orthopédique d’Ouchy.
Understanding through video
Three videos explore the repercussions of FHL on the spine in greater depth: the biomechanical consequences of the big toe blockage, osteoarthritis of the back and the pathophysiology of low back pain.
Biomechanical consequences of functional hallux limitus
Osteoarthritis of the back
Pathophysiology of low back pain
Does this concern you?
Identify the origin of your pain
If your low back pain resists the usual treatments and worsens with walking, the mobility assessment at the Centre du pied makes it possible to objectively document any underlying FHL that is the cause.
At a glance
Main area
lumbar
Mechanism
pelvic tilt
Aggravated by
walking
Relieved by
rest in flexion
Imaging
usually normal
Reference
Dananberg, 1993