{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T02:25:18Z","timestamp":1791253518011,"version":"4.1.0"},"reference-count":37,"publisher":"British Editorial Society of Bone & Joint Surgery","issue":"8","license":[{"start":{"date-parts":[[2008,8,1]],"date-time":"2008-08-01T00:00:00Z","timestamp":1217548800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/online.boneandjoint.org.uk\/TDM"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The Journal of Bone and Joint Surgery. British volume"],"published-print":{"date-parts":[[2008,8]]},"abstract":"<jats:p>The rotational alignment of the tibia is an unresolved issue in knee replacement. A poor functional outcome may be due to malrotation of the tibial component. Our aim was to find a reliable method for positioning the tibial component in knee replacement.<\/jats:p>\n                  <jats:p>CT scans of 19 knees were reconstructed in three dimensions and orientated vertically. An axial plane was identified 20 mm below the tibial spines. The centre of each tibial condyle was calculated from ten points taken round the condylar cortex. The tibial tubercle centre was also generated as the centre of the circle which best fitted eight points on the outside of the tubercle in an axial plane at the level of its most prominent point.<\/jats:p>\n                  <jats:p>The derived points were identified by three observers with errors of 0.6 mm to 1 mm. The medial and lateral tibial centres were constant features (radius 24 mm (sd 3), and 22 mm (sd 3), respectively). An anatomical axis was created perpendicular to the line joining these two points. The tubercle centre was found to be 20 mm (sd 7) lateral to the centre of the medial tibial condyle. Compared with this axis, an axis perpendicular to the posterior condylar axis was internally rotated by 6\u00b0 (sd 3). An axis based on the tibial tubercle and the tibial spines was also internally rotated by 5\u00b0 (sd 10).<\/jats:p>\n                  <jats:p>Alignment of the knee when based on this anatomical axis was more reliable than either the posterior surfaces or any axis involving the tubercle which was the least reliable landmark in the region.<\/jats:p>","DOI":"10.1302\/0301-620x.90b8.19905","type":"journal-article","created":{"date-parts":[[2008,7,31]],"date-time":"2008-07-31T17:24:03Z","timestamp":1217525043000},"page":"1032-1038","source":"Crossref","is-referenced-by-count":126,"title":["The anatomical tibial axis"],"prefix":"10.1302","volume":"90-B","author":[{"given":"J. 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