Ryan Mania is to remain in hospital after falling from his horse at Hexham racecourse in Northumberland.
The Grand National winning jockey is being treated in hospital in Newcastle following the accident on Sunday April 7th.
His condition is comfortable.
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The 60-year-old takes charge of the Black Cats with immediate effect.
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The operation took around three hours to complete, with the remains being disposed of by a specialist animal by-product company.