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Introduction
The resulting strengths exercised by the foot at the time of the progress of the step (march or race) vary according to several factors:
- Bodily – Weight - Speed of displacement
- Morphology of the foot - Nature of soil
- Used – Shoe - Frequency of the passage in support (Clarke, 1980) (Plas and coll., 1983)
As an example, the strengths of impact to the attack of the heel to soil at the time of a normal march vary 120% to 165% of the weight of the body. At the time of a race (12,6 km/hs), these strengths reach 245% of the bodily weight. (Plas and coll., 1983)
The important accelerations and decelerations bound to every progress of the step can return the laborious activity. These numerous variations of speed can be felt toughly not only at the level of lower member joints, but also at the level of the backbone and the head. It is therefore important to minimize them in order to warn the different traumatisms can occur, because the osteoarticular and muscular - sinewy structures are structures fatigueless.
According to the previous studies, a deformable sole progressively, having 20 to 30 mms of thickness to the heel, reduced the intensity of these speed changes and produces a sensation of comfort. This effect is a preventive factor of the lesions microphone traumatic bound to the march and the footrace. However, the thickness of 20 to 30 mms can generate problems of instability, of incorporation problems in the shoe and an increase of the weight of the shoe. To palliate these constraints, two solutions appraising,:
1- reduction of the thickness of the sole
2- optimisation of the mechanical features of materials used
3- toughness
4- viscoelastic
Definition of the term VISCOELASTIC :
VISCO:
advantages:
- amortization
- osteoarticular and myo - sinewy lesion prevention
disadvantages:
- lengthens the time of reaction, what decreases the gesture efficiency,
- a supplementary tension is exercised to compensate this effect, what brings a muscular - sinewy risk factor.
ELASTIC:
advantage:
- Restate the stored energy (during the distortion) at the time of the phase of propulsion.
disadvantage:
- if too important, can increase the shock in ricochet because of his effect « resort ».
It is necessary to arrive therefore to a « compromise viscoelastic » optimal to answer adequately to the sporty, ergonomic, preventive and curative objectives. As it is demonstrated in this survey, it is to what answers the material Catane viscoelastic.
A survey: Survey of the efficiency of the daily harbour of Catane soles
Subjects: 11 healthy, 7 suffering of pathologies (tatalgie and metatalgie)
Materiel: Catane F1 1,8mm of thickness 1000 points diamond placed under the interior sole and carried during 3 weeks.
Parameters studies: Static (standing position)
Normal Dynamic (march)
- amortization
- comfort
- stability
(topics answered to a questionnaire including four levels of appreciation following the three weeks of use).
Results:
topics pathologic: stake in evidence of the big efficiency of the Catane to decrease or to suppress the pain. It assures a static comfort but especially dynamic by the sensation of drop shot at the time of the attack of the heel to soil.
healthy topics: the harbour of the Catane proved to be mainly efficient for the dynamic parameters, the static parameters not having been modified.
Discussion
The set of results put in evidence the efficiency of the Catane as material viscoelastic for two uses differences:
- for chronic pain cessation to the heel or in the front foot.
- for improvement of the comfort and of absorbed it at the time of the attack of the heel to soil, and for reduction of the pressure under heads metatarsi at the time of the pushed of the foot at topics presenting no pathology.
It is therefore about a material that presents at a time a curative interest and a preventive interest in the domain of podiatry.
It is important to also note that these results have been acheived in spite of the very weak used thickness, what represents a duplicate interest:
- easiness of incorporation
- non-perturbation of the stability of the foot
The quality of these results could be bound to the fact that the Catane presents the same impedance that the human body, what avoids returns of wave and protect the body human of tendonitis, muscular pains, articular pains, etc.
B survey: Measure of pressures plantar on platform by force
Subjects: 2 healthy
Materiel: Catane F1 1,8mm of thickness 1000 points diamond incorporated in the sole.
Parameter studies: Pressure plantar at the time of a march
Results: A topic: 4,5 km/h without Catane: 1968 gr/cm2 with Catane: 1451 gr/cm2 (-26%)
A topic: 5,0 km/h without Catane: 2258 gr/cm2 with Catane: 1340 gr/cm2 (-41%)
B topic: 5,5 km/h without Catane: 3105 gr/cm2 with Catane: 2239 gr/cm2 (-28%)
Discussion
Although these simple measures do not really go in the setting of the present survey, they put in evidence the effect absorbing the Catane at the time of the impact of the heel, and that, at the time of a simple walk. This second portion of the survey could be the object of research more in depth in order to confirm these exploratory results.
Therapeutic indications for use of the Catane
- atrophy of caption plantar
- posterior hollow foot
- distortion fixed of the before foot
- dorsal, cervical, lumbago,
- foot valgus
- sciatica
- fracture of tiredness of the 2nd metatarsal
- aponevrosity of insertion
- heeling of the sportsman
- tendonitis of Achilles
- syndrome of the 2nd ray
- plantar’s wart
- epiphysis metatarsal
- hyper kératose heeling
- rheumatic affection
- pseudochromidrose
- sesamoïdopathie
- osteoarthritis
- illness of Sever
- foot equine
- previous hollow foot
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