It looks like Mike Rupp’s wonky knee is a bit wonkier than initially thought. Andrew Gross is reporting that Rupp will undergo othorscopic surgery next week, and a timetable for his return is uncertain. The Rangers had this issue with both Vinny Prospal and Chris Drury last year, as both had lingering knee issues that required orthoscopic surgery. Both players were out the majority of the season following surgery, as it was initially unclear what was wrong with them. This appears to be the same situation with Rupp, as the team (via Gross) has said they have no idea when Rupp will be back.
This could be one of those injuries where Rupp winds up out anywhere from six weeks to six months, depending on the healing process, and what is actually wrong with his knee. Until then, it looks like Andre Deveaux and/or Sean Avery could be with the team for an extended period of time.