The indications for arthroscopic debridement of the arthritic knee include mechanical internal derangement such as loose bodies, meniscal flap tears, chondral flap tears, and osteophytic impingement. This article reviews three associated conditions that respond positively to arthroscopic intervention. Arthroscopic microfracture has shown benefit, but prolonged partial weight bearing and repetitive motion exercises are essential for improved results. Arthroscopic lateral patella facet resection for severe, isolated patellofemoral arthrosis provides an intraosseous decompression and consistent symptomatic relief. A study of arthroscopic resection of the third intercondylar of Parsons demonstrated return to full knee extension, which should diminish deterioration of the arthritic knee.