Comparison of a simplified skin pointer device compared with a skeletal marker for knee rotation laxity : a cadaveric study using a rotation-meter
AIM : To compare the measurements of knee rotation laxity by non-invasive skin pointer with a knee rotation jig in cadaveric knees against a skeletally mounted marker. METHODS : Six pairs of cadaveric legs were mounted on a knee rotation jig. One Kirscher wire was driven into the tibial tubercle as...
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sg-ntu-dr.10356-1068662023-03-04T17:21:49Z Comparison of a simplified skin pointer device compared with a skeletal marker for knee rotation laxity : a cadaveric study using a rotation-meter Puah, Ken Lee Yew, Andy Khye Soon Chou, Siaw Meng Lie, Denny Tijauw Tjoen School of Mechanical and Aerospace Engineering Rotatometer Rottometer Engineering::Mechanical engineering AIM : To compare the measurements of knee rotation laxity by non-invasive skin pointer with a knee rotation jig in cadaveric knees against a skeletally mounted marker. METHODS : Six pairs of cadaveric legs were mounted on a knee rotation jig. One Kirscher wire was driven into the tibial tubercle as a bone marker and a skin pointer was attached. Rotational forces of 3, 6 and 9 nm applied at 0°, 30°, 45°, 60° and 90° of knee flexion were analysed using the Pearson correlation coefficient and paired t-test. RESULTS : Total rotation recorded with the skin pointer significantly correlated with the bone marker at 3 nm at 0° (skin pointer 23.9 ± 26.0° vs bone marker 16.3 ± 17.3°, r = 0.92; P = 0.0), 30° (41.7 ± 15.5° vs 33.1 ± 14.7°, r = 0.63; P = 0.037), 45° (49.0 ± 17.0° vs 40.3 ± 11.2°, r = 0.81; P = 0.002), 60° (45.7 ± 17.5° vs 34.7 ± 9.5°, r = 0.86; P = 0.001) and 90° (29.2 ± 10.9° vs 21.2 ± 6.8°, r = 0.69; P = 0.019) of knee flexion and 6 nm at 0° (51.1 ± 37.7° vs 38.6 ± 30.1°, r = 0.90; P = 0.0), 30° (64.6 ± 21.6° vs 54.3 ± 15.1°, r = 0.73; P = 0.011), 45° (67.7 ± 20.6° vs 55.5 ± 9.5°, r = 0.65; P = 0.029), 60° (62.9 ± 22.4° vs 45.8 ± 13.1°, r = 0.65; P = 0.031) and 90° (43.6 ± 17.6° vs 31.0 ± 6.3°, r = 0.62; P = 0.043) of knee flexion and at 9 nm at 0° (69.7 ± 40.0° vs 55.6 ± 30.6°, r = 0.86; P = 0.001) and 60° (74.5 ± 27.6° vs 57.1 ± 11.5°, r = 0.77; P = 0.006). No statistically significant correlation with 9 nm at 30° (79.2 ± 25.1° vs 66.9 ± 15.4°, r = 0.59; P = 0.055), 45° (80.7 ± 24.7° vs 65.5 ± 11.2°, r = 0.51; P = 0.11) and 90° (54.7 ± 21.1° vs 39.4 ± 8.2°, r = 0.55; P = 0.079). We recognize that 9 nm of torque may be not tolerated in vivo due to pain. Knee rotation was at its maximum at 45° of knee flexion and increased with increasing torque. CONCLUSION : The skin pointer and knee rotation jig can be a reliable and simple means of quantifying knee rotational laxity with future clinical application. Published version 2019-06-27T08:23:48Z 2019-12-06T22:19:58Z 2019-06-27T08:23:48Z 2019-12-06T22:19:58Z 2018 Journal Article Puah, K. L., Yew, A. K. S., Chou, S. M., & Lie, D. T. T. (2018). Comparison of a simplified skin pointer device compared with a skeletal marker for knee rotation laxity : a cadaveric study using a rotation-meter. World Journal of Orthopedics, 9(6), 85-91. doi:10.5312/wjo.v9.i6.85 https://hdl.handle.net/10356/106866 http://hdl.handle.net/10220/48993 10.5312/wjo.v9.i6.85 en World Journal of Orthopedics © 2018 The Author(s). Published by Baishideng Publishing Group Inc. All rights reserved. This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/ 7 p. application/pdf |
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Rotatometer Rottometer Engineering::Mechanical engineering Puah, Ken Lee Yew, Andy Khye Soon Chou, Siaw Meng Lie, Denny Tijauw Tjoen Comparison of a simplified skin pointer device compared with a skeletal marker for knee rotation laxity : a cadaveric study using a rotation-meter |
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AIM : To compare the measurements of knee rotation laxity by non-invasive skin pointer with a knee rotation jig in cadaveric knees against a skeletally mounted marker. METHODS : Six pairs of cadaveric legs were mounted on a knee rotation jig. One Kirscher wire was driven into the tibial tubercle as a bone marker and a skin pointer was attached. Rotational forces of 3, 6 and 9 nm applied at 0°, 30°, 45°, 60° and 90° of knee flexion were analysed using the Pearson correlation coefficient and paired t-test. RESULTS : Total rotation recorded with the skin pointer significantly correlated with the bone marker at 3 nm at 0° (skin pointer 23.9 ± 26.0° vs bone marker 16.3 ± 17.3°, r = 0.92; P = 0.0), 30° (41.7 ± 15.5° vs 33.1 ± 14.7°, r = 0.63; P = 0.037), 45° (49.0 ± 17.0° vs 40.3 ± 11.2°, r = 0.81; P = 0.002), 60° (45.7 ± 17.5° vs 34.7 ± 9.5°, r = 0.86; P = 0.001) and 90° (29.2 ± 10.9° vs 21.2 ± 6.8°, r = 0.69; P = 0.019) of knee flexion and 6 nm at 0° (51.1 ± 37.7° vs 38.6 ± 30.1°, r = 0.90; P = 0.0), 30° (64.6 ± 21.6° vs 54.3 ± 15.1°, r = 0.73; P = 0.011), 45° (67.7 ± 20.6° vs 55.5 ± 9.5°, r = 0.65; P = 0.029), 60° (62.9 ± 22.4° vs 45.8 ± 13.1°, r = 0.65; P = 0.031) and 90° (43.6 ± 17.6° vs 31.0 ± 6.3°, r = 0.62; P = 0.043) of knee flexion and at 9 nm at 0° (69.7 ± 40.0° vs 55.6 ± 30.6°, r = 0.86; P = 0.001) and 60° (74.5 ± 27.6° vs 57.1 ± 11.5°, r = 0.77; P = 0.006). No statistically significant correlation with 9 nm at 30° (79.2 ± 25.1° vs 66.9 ± 15.4°, r = 0.59; P = 0.055), 45° (80.7 ± 24.7° vs 65.5 ± 11.2°, r = 0.51; P = 0.11) and 90° (54.7 ± 21.1° vs 39.4 ± 8.2°, r = 0.55; P = 0.079). We recognize that 9 nm of torque may be not tolerated in vivo due to pain. Knee rotation was at its maximum at 45° of knee flexion and increased with increasing torque. CONCLUSION : The skin pointer and knee rotation jig can be a reliable and simple means of quantifying knee rotational laxity with future clinical application. |
author2 |
School of Mechanical and Aerospace Engineering |
author_facet |
School of Mechanical and Aerospace Engineering Puah, Ken Lee Yew, Andy Khye Soon Chou, Siaw Meng Lie, Denny Tijauw Tjoen |
format |
Article |
author |
Puah, Ken Lee Yew, Andy Khye Soon Chou, Siaw Meng Lie, Denny Tijauw Tjoen |
author_sort |
Puah, Ken Lee |
title |
Comparison of a simplified skin pointer device compared with a skeletal marker for knee rotation laxity : a cadaveric study using a rotation-meter |
title_short |
Comparison of a simplified skin pointer device compared with a skeletal marker for knee rotation laxity : a cadaveric study using a rotation-meter |
title_full |
Comparison of a simplified skin pointer device compared with a skeletal marker for knee rotation laxity : a cadaveric study using a rotation-meter |
title_fullStr |
Comparison of a simplified skin pointer device compared with a skeletal marker for knee rotation laxity : a cadaveric study using a rotation-meter |
title_full_unstemmed |
Comparison of a simplified skin pointer device compared with a skeletal marker for knee rotation laxity : a cadaveric study using a rotation-meter |
title_sort |
comparison of a simplified skin pointer device compared with a skeletal marker for knee rotation laxity : a cadaveric study using a rotation-meter |
publishDate |
2019 |
url |
https://hdl.handle.net/10356/106866 http://hdl.handle.net/10220/48993 |
_version_ |
1759858206079713280 |