From the definition provided in the discussion box

https://www.americanfarriers.com/articles/827-dealing-with-c...

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Coronary Brand Irritations
An irritation of the perioplic ring and/or the coronary corium at the coronary band is often found with horses that are kept in stalls for long periods. Coronary band irritations can also occur when hooves are looked after intensively on a daily basis.

Causes
An irritation of the coronary band under the horse’s hair can be caused by frequently scrubbing the hooves with a stiff brush or from the excessive use of oils, ointments and irritant products. These products sometimes blister the perioplic ring, the perioplic corium and coronary corium.

With the long-term use of such products, irritation of the coronary band can occur. This may result in an inflammation of the perioplic ring, the coronary corium under the perioplic ring or the bulb corium at the back of the hoof. Such irritations can eventually lead to a change in the horn structure.

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I think we should be wary of translating this as "canker". From my understanding, crapaud and crapaudine are two separate entities.

See:

http://s403403540.onlinehome.fr/pathologie/pied/crapaud.html

De fait, le crapaud est d'origine constitutionnelle et est la manifestation locale d'un état morbide général : la diathèse eczémateuse, ou eczéma. La maladie est d'ailleurs souvent concomitante avec le psoriasis de la couronne, ou crapaudine et les eaux aux jambes, qui sont incontestablement des manifestations de l'eczéma.


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https://dumas.ccsd.cnrs.fr/dumas-02006105/document


A. Description
La crapaudine, également appelé psoriasis de la couronne, est une affection semblable à la
maladie de crapaud. Il s’agit d’une inflammation chronique du bourrelet périoplique. Elle
attaque la partie antérieure du pied en commençant au niveau du bourrelet et entraîne sa
déformation.
34
B. Origine
La crapaudine a une origine constitutionnelle, elle se manifeste chez des équidés prédisposés
à terrain eczémateux.
C. Diagnostic
Le diagnostic est fait sur la clinique avec présence d’une corne à aspect rugueux, fendillé,
irrégulier avec de nombreuses craquelures.
D. Traitement
Le traitement repose sur l’ablation de la corne morte et des soins locaux.

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Coronary band (dysplasia) dystrophy
Profile
An idiopathic defect in cornification of the coronary band which affects all four hooves more or less simultaneously and equally. Mature horses of draught breeds seem most susceptible and most cases are reported to be affected from a young age; the signs may not be severe and may easily be overlooked in the growing horse.

imageKey points: Coronary band (dysplasia) dystrophy

image image image image image image

1. A sporadic rare disorder of the coronary band largely restricted to heavy draught breeds. Possibly therefore some genetic aspect.

2. Proliferative, scaling condition of the coronary band only; the pastern skin is usually unaffected. Possibly some consequent alterations in the hoof quality, particularly with loss of periople and a rough, crumbly hoof wall quality.

3. Diagnosis is made by eliminating other causes of coronary band disease and inflammation.

4. Treatment is difficult. Restoration of normal keratinocyte function may be possible with retinoids.

5. The prognosis for resolution is poor – ongoing management and hoof difficulties are almost inevitable. Some horses cope well for many years.

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So,
another possibility is


coronary band dystrophy


There is another disease entity termed “coronary band dystrophy,” which appears to have an immune-mediated component that is associated with or can lead to canker (O'Grady SE. ... At onetime, canker was commonly seen in draft breeds, but now is diagnosed in all breeds,especially Thoroughbred and warm blood horses.

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Coronary Band Injury: Long-Lasting Effects and Permanent ...horse-canada.com › magazine › hoof-care › coronary-...
16 Oct 2013 — Coronary band dystrophy (or dysplasia), causes inflammation of the coronary bands of all four hooves, leading to scaling and sometimes crusty sores that bleed and ooze pus. It appears to occur more in drafts than other breeds. There is no known cause.

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https://forums.horseandhound.co.uk/threads/coronary-band-dys...

Coronary band dystrophy
Thread starterTegan Start date2 June 2013
2 June 2013#1
Tegan
Well-Known Member
Joined17 March 2007
Messages174
Hi

Does anyone have any experience of this condition and it's management. I know that it is an auto immune problem and that we need to manage it rather than being able to cure it. Currently we are treating it with Zorac gel which is a human treatment for psoriasis. This got rid if it for 6 months but it is now back and we are using the gel again which (fingers crossed) seems to be going well.

I am interested in any ones experiences in managing this condition.