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The purposes of this study were to determine whether baseplate migration at 1 year (1) was significantly less than a stability limit of 0.5\u00a0mm, (2) increased over time, and (3) was related to varus alignment of the baseplate and limb after unrestricted KA TKA.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Thirty\u2010five patients underwent unrestricted KA TKA using a fixed\u2010bearing, cemented, medial conforming tibial insert with posterior cruciate ligament retention. Using model\u2010based radiostereometric analysis, maximum total point motion (MTPM) (i.e., largest displacement on the baseplate) was computed at 6 weeks, 3\u00a0months, 6\u00a0months, and 1 year postoperatively relative to the day of surgery. Baseplate and limb alignment were measured postoperatively on long\u2010leg CT scanograms.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      At 1 year, mean MTPM of 0.35\u00a0mm was significantly less than the 0.5\u00a0mm stability limit (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.0002). Mean MTPM did not increase from 6 weeks to 1 year (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.3047). Notably, 89% (31\/35) of tibial baseplates and 46% (16\/35) of limbs were\u2009&gt;\u20093\u00b0 varus. Baseplate and limb alignment had no relationship to MTPM at 1 year (|\n                      <jats:italic>r<\/jats:italic>\n                      |\u2264\u20090.173,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009\u2265\u20090.3276).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Low and non\u2010progressive tibial baseplate migration 1 year after unrestricted KA TKA with a medial conforming design should allay any concern that unrestricted KA TKA increases risk of baseplate loosening due to varus alignment of the baseplate and limb.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of evidence<\/jats:title>\n                    <jats:p>Level II, therapeutic prospective cohort study.<\/jats:p>\n                  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