my revision arthroscopy

I have now had my second arthroscopy. Had the first 8 months ago where 30% medial meniscus reomved but have suffred generalised ache in knee ever since. Hence had a repeat arthroscopy to see if a cause for the pain could be found but none seen other than a bit of further(suspect meniscus) was removed. But generalised ache in knee joint set in again comes on after I stress joint ie work on muscles etc. No OA seen as yet but sure to follow. Anyone with similar experience who may be able to shed some light?? Thanks, Philip