Fig. 1From: Synovial inflammation plays a greater role in post-traumatic osteoarthritis compared to idiopathic osteoarthritis in the Hartley guinea pig kneeIndia ink staining of 3-month, 12-month, 5.5-ACLT, 6.5-ACLT, 7.5-ACLT, and Sham tibial joints. The right tibia of the 5.5-ACLT joint looked most similar to that of the 12-month primary OA joint (red box). Size and intensity of the staining marked severity of the joint (dashed circles). (Original magnification, × 10)Back to article page