Functional hallux limitus: impact on balance and movement
Dr. Jacques Vallotton presents the functional impact of hallux limitus on human gait, particularly the imbalances caused in the sagittal plane. He discusses the biomechanical consequences on the pelvis, posture, and lower limbs, as well as the associated muscular compensations. This video sheds light on the link between foot disorders and lower back pain.
Doctors
Topics
Treatments
Advice
- Dr Jacques Vallotton
- Definition of functional hallux limitus
- Biomechanical repercussions on posture
- Blockage in the sagittal plane
- Muscle compensation
- Lower back pain
- Dedicated arch support
- Hallux limitus can cause postural disorders
- there are specific plantar supports
- back pain may be related to a foot disorder
Sagittal Plane Blockage: Understanding the Domino Effect
The blockage in the sagittal plane can be local (pelvis, spine) or transmitted from the foot. Functional hallux limitus prevents the terminal tilt of the first ray and disrupts balance.
The body compensates by an anterior tilt of the pelvis and a projection of the trunk, generating constraints on the lower limb and the lower back.
Normal walking: an economical movement
Physiological walking is similar to an inverted pendulum, with no concentric contraction during the stance phase. Energy is returned by segmental mechanics.
When the tipping point is lost, energy saving disappears, muscle chains become over-activated and fatigue sets in more quickly.
Functional hallux limitus is a bit like the Columbus egg of orthopedics.
Biomechanical consequences on posture and the lumbar spine
The lack of sufficient dorsiflexion at the first ray disrupts the 'rockers' of walking. The knee remains flexed, the hip struggles to extend, and the trunk vectors compensate.
These adaptations can contribute to low back pain and dynamic balance disorders.
Observable clinical signs and identification
On the mat, a lateral sweep and a posterolateral heel strike may be visible. At the end of the support, pronation persists while supination should be established.
Joint analysis of support and kinematics guides the treatment plan.
Loss of the reference tipping point causes the upper body to fall forward.
Plantar supports and a graduated approach
Specific arch supports can restore the tipping point and reduce compensations. They are part of a rehabilitation program focused on coordination and posture.
This strategy aims to restore more efficient walking and reduce associated pain.
Perspective for the patient with low back pain
Back pain is not inevitable. A foot and gait assessment may reveal an unknown contributing factor.
Correcting the blockage upstream improves general mechanics and contributes to the lasting reduction of symptoms.
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