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Fig. 1 | BMC Musculoskeletal Disorders

Fig. 1

From: Accelerated knee osteoarthritis is associated with pre-radiographic degeneration of the extensor mechanism and cruciate ligaments: data from the Osteoarthritis Initiative

Fig. 1

Examples of the Index Visit and Observation Period for a Member of Each Group. Key abbreviations: Accelerated Knee Osteoarthritis (AKOA), Knee Osteoarthritis (KOA), or No KOA. Kellgren-Lawrence (KL), Osteoarthritis Initiative (OAI). The red font represents the index visit (visit relative to index = 0). For individuals with accelerated or typical KOA, the index visit was the OAI visit when a person met the criteria for accelerated or typical KOA, respectively. * For someone with no KOA, the index visit was the same visit as that person’s matched member of the incident accelerated KOA group. The observation period was up to 2 years before and after the index visit (visit relative to index = −2 to 2 years)

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