St Kilda's Armitage goes under knife again

St Kilda's star midfielder David Armitage will be sidelined for at least another month after undergoing a second round of surgery to resolve adductor issues that have plagued his season.

The 28-year-old has only managed two appearances and hasn't played since round four after having adductor release surgery at the end of April.

This time Armitage's operation was on a hernia.

Saints' Jamie Cox said Armitage would be out for between four and six weeks.

"Dave has been having a bit of an issue in the groin-adductor area. He had hernia repair surgery yesterday, which seems to have been very successful," Cox told saints.com.au.