To be honest, I don't think will be any difficulties with Matthew's willy and pulling it off.
[snurk]
Diagnostic medicine being what it was, they have no way of knowing what spinal damage there has been and whether it is permanent or not. No, people don't recover from broken spinal cords very often, especially if they've been transported as they would have been in WW1, but spinal injuries are not always permanent ones.