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. 2020 Jul 9;5(3):e19.00073. doi: 10.2106/JBJS.OA.19.00073

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Copyright © 2020 The Authors. Published by The Journal of Bone and Joint Surgery, Incorporated. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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Fig. 1 — Figs. 1-A, 1-B, and 1-C The Osteoarthritis Research Society International (OARSI) score offers a more standardized and granular radiographic assessment than does Kellgren-Lawrence (KL) grade. All 3 knee radiographs demonstrate KL grade-4 osteoarthritis (OA) given definite osteophyte formation and severe joint-space narrowing. However, the OARSI score is different for each radiograph, demonstrating differences in the presence of osteophytes and differences in medial and lateral involvement. Fig. 1-A Advanced knee OA: KL grade 4, OARSI score of 17. Fig. 1-B Advanced knee OA: KL grade 4, OARSI score of 9. Fig. 1-C Advanced knee OA: KL grade 4, OARSI score of 8.