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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: Osteoarthritis Cartilage. 2013 Mar 14;21(6):839–848. doi: 10.1016/j.joca.2013.03.003

Fig. 2.

Fig. 2

Posterior views of distal femora illustrating the four OA severity grades: A, Grade 1 = unaffected; B, Grade 2 = mild OA (cartilage fibrillation); C, Grade 3 = moderate OA (cartilage lesion); D, Grade 4 = advanced OA (eburnation). Higher magnification view of affected area is provided below each specimen. Images differ slightly in scale and orientation to provide the best view of the area of interest.