Carberry Sidelined Nina Carberry is set to miss several weeks of action and almost certainly the Cheltenham Open meeting after breaking her collarbone.The leading amateur rider was involved in a nasty incident at Punchestown on Wednesday when her mount Northern Command was one of four horses brought down.It was caused by Superior Ben slipping and his rider Paddy Kennedy has a suspected fracture of his left leg.Carberry's agent Shane Lyons said: 'The collarbone is broken, so I should think she will be out for the best part of three weeks.'(C) PA Sport