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Non-responders to THR for OA identified in three different ways: (a) Defined as patients who scored worst (lowest quartile) in WOMAC function at 3.6 year follow up, (circle A, 23/92 (25%)); (b) defined as patients who reported an absolute improvement from baseline to 3.6 year follow up of <20 score units (circle B, 20/92 (22%)); (c) defined according to OARSI criteria (circle C, 8/92 (9%)). The patients included in this figure are based the longitudinal data (n=92).
