Pulled Muscle For Rembrandt Sir Rembrandt, who was ruled out of the John Smith's Grand National at the 11th-hour, has been found to have pulled a pectoral muscle.Trainer Robert Alner was forced to abandon his bid for Aintree glory after the 10-year-old pulled out lame on Thursday morning.The Dorset handler had suspected a leg problem but intended big-race pilot Andrew Thornton revealed that is not the case.He said: 'He has pulled a pectoral muscle ? it's not a lot but enough to keep him out.'His legs are fine but he has just hurt a little muscle in his chest.'? PA Sport