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Patellofemoral joint kinematics: The circular path of the patella around the trochlear axis

Differing descriptions of patellar motion relative to the femur have resulted from previous studies. We hypothesized that patellar kinematics would correlate to the trochlear geometry and that differing descriptions could be reconciled by accounting for differing alignments of measurement axes. Seve...

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Main Authors: Iranpour, F., Merican, A.M., Rodriguez Ybaena, F., Cobb, J.P., Amis, A.A.
Format: Article
Published: Elsevier 2010
Subjects:
R Medicine
Online Access:http://eprints.um.edu.my/14726/
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spelling my.um.eprints.147262015-11-11T02:21:15Z http://eprints.um.edu.my/14726/ Patellofemoral joint kinematics: The circular path of the patella around the trochlear axis Iranpour, F. Merican, A.M. Rodriguez Ybaena, F. Cobb, J.P. Amis, A.A. R Medicine Differing descriptions of patellar motion relative to the femur have resulted from previous studies. We hypothesized that patellar kinematics would correlate to the trochlear geometry and that differing descriptions could be reconciled by accounting for differing alignments of measurement axes. Seven normal fresh-frozen knees were CT scanned, and their kinematics with quadriceps loading was measured by an optical tracker system. Kinematics was calculated in relation to the femoral epicondylar, anatomic, and mechanical axes. A novel trochlear axis was defined, between the centers of spheres best fitted to the medial and lateral trochlear articular surfaces. The path of the center of the patella was circular and uniplanar (root-mean-square error 0.3 mm) above 16 +/- 3 degrees (mean +/- SD) knee flexion. In the coronal plane, this circle was aligned 6 +/- 2 degrees from the femoral anatomical axis, close to the mechanical axis alignment. It was 91 +/- 3 degrees from the epicondylar axis, and 88 +/- 3 degrees from the trochlear axis. In the transverse plane it was 91 +/- 3 degrees and 88 +/- 3 degrees from the epicondylar and trochlear axes, respectively. Manipulation of the data to different axis alignments showed that differing previously published data could be reconciled. The circular path of patellar motion around the trochlea, aligned with the mechanical axis of the leg, is easily visualized and understood. (C) 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 28:589-594, 2010 Elsevier 2010 Article PeerReviewed Iranpour, F. and Merican, A.M. and Rodriguez Ybaena, F. and Cobb, J.P. and Amis, A.A. (2010) Patellofemoral joint kinematics: The circular path of the patella around the trochlear axis. Journal of Orthopaedic Research, 28 (5). pp. 589-594.
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic R Medicine
spellingShingle R Medicine
Iranpour, F.
Merican, A.M.
Rodriguez Ybaena, F.
Cobb, J.P.
Amis, A.A.
Patellofemoral joint kinematics: The circular path of the patella around the trochlear axis
description Differing descriptions of patellar motion relative to the femur have resulted from previous studies. We hypothesized that patellar kinematics would correlate to the trochlear geometry and that differing descriptions could be reconciled by accounting for differing alignments of measurement axes. Seven normal fresh-frozen knees were CT scanned, and their kinematics with quadriceps loading was measured by an optical tracker system. Kinematics was calculated in relation to the femoral epicondylar, anatomic, and mechanical axes. A novel trochlear axis was defined, between the centers of spheres best fitted to the medial and lateral trochlear articular surfaces. The path of the center of the patella was circular and uniplanar (root-mean-square error 0.3 mm) above 16 +/- 3 degrees (mean +/- SD) knee flexion. In the coronal plane, this circle was aligned 6 +/- 2 degrees from the femoral anatomical axis, close to the mechanical axis alignment. It was 91 +/- 3 degrees from the epicondylar axis, and 88 +/- 3 degrees from the trochlear axis. In the transverse plane it was 91 +/- 3 degrees and 88 +/- 3 degrees from the epicondylar and trochlear axes, respectively. Manipulation of the data to different axis alignments showed that differing previously published data could be reconciled. The circular path of patellar motion around the trochlea, aligned with the mechanical axis of the leg, is easily visualized and understood. (C) 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 28:589-594, 2010
format Article
author Iranpour, F.
Merican, A.M.
Rodriguez Ybaena, F.
Cobb, J.P.
Amis, A.A.
author_facet Iranpour, F.
Merican, A.M.
Rodriguez Ybaena, F.
Cobb, J.P.
Amis, A.A.
author_sort Iranpour, F.
title Patellofemoral joint kinematics: The circular path of the patella around the trochlear axis
title_short Patellofemoral joint kinematics: The circular path of the patella around the trochlear axis
title_full Patellofemoral joint kinematics: The circular path of the patella around the trochlear axis
title_fullStr Patellofemoral joint kinematics: The circular path of the patella around the trochlear axis
title_full_unstemmed Patellofemoral joint kinematics: The circular path of the patella around the trochlear axis
title_sort patellofemoral joint kinematics: the circular path of the patella around the trochlear axis
publisher Elsevier
publishDate 2010
url http://eprints.um.edu.my/14726/
_version_ 1643689887060197376
score 13.211869

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