So, if he has an injury, then let it be known. I'm not sure what he hopes to achieve by keeping it quiet. He's maybe not injured - maybe clay just pisses him off - that I can understand.
Andy has kept the nature of the injury to himself because he doesn't want opponents to use it. He said quite clearly yesterday that certain shots hurt, though he quite rightly didn't say what they were. If an opponent knew exactly what was wrong, or what shots they could use that would cause Andy pain, they would just use it to beat him. If the shoe was on the other foot Andy would do the same. It's human nature.
I think Andy is also entitled to privacy. If Nadal can give out three different diagnoses for his knee problem I have no problem whatsoever with Andy not announcing what his injury is from the rooftops. The fact that he patently obviously is injured and that the clay, or rather the way you have to play on clay, makes it worse, should be enough.
The clay pee's me right off. I'd rip all the clay courts up and replace them with hard and grass. I bet Nadal would love me