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The trend for WOMAC pain scores over 3 years for the whole group is shown. The scores increased at 3 months, reached a peak at 1 year, and then stabilized. WPPreop = preoperative WOMAC pain score; WP3Mth = 3-month WOMAC pain score; WP1 yr = 1-year WOMAC pain score; WP2 yr = 2-year WOMAC pain score; WP3 yr = 3-year WOMAC pain score.
