Rigor Mortis drummer Harden Harrison is facing surgery after a freak incident with his motorcycle.

The musician attempted to grab his bike to stop the vehicle from falling over and caused "severe damage" to his shoulder and now needs an operation to repair the injury.

His bandmate Bruce Corbitt reveals in a post on his Facebook.com page, "Rigor Mortis drummer Harden Harrison had a freak accident the other day when he (sic) motorcycle fell over and he grabbed at a weird angle it (sic) to prevent it from falling.

"The weight from the motorcycle did severe damage to his shoulder. He just got the results from the Mri and it was bad news. He has a torn rotator cup and has to have surgery on June 6. He will be in a sling for at least two months."

As a result of the injury, Harrison has pulled out of a performance at a concert honouring his late bandmate Mike Scaccia next month (Jun13).