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Geographical Prevalence of Isolated Patellofemoral osteoarthritis

Osteoarthritis is not a single disease [1]. Osteoarthritis affects isolated Tibiofemoral compartment, isolated patellofemoral compartment or the both combined of them. Among various approaches to sub classification of knee osteoarthritis, European League against Rheumatism (EULAR) Task Force recognized subtype of compartmental distribution for diagnosis of osteoarthritis [2]. Traditionally, in cases of osteoarthritis of knee most of the research has focused on understanding of general osteoarthritis of knee or tibiofemoral osteoarthritis of knee. In fact, isolated patellofemoral osteoarthritis may not be so rare. Even though, the PF compartment is rarely considered in investigation of osteoarthritis.