Automatic string generation for estimating in vivo length changes of the medial patellofemoral ligament during knee flexion.
Modeling ligaments as three-dimensional strings is a popular method for in vivo estimation of ligament length. The purpose of this study was to develop an algorithm for automated generation of non-penetrating strings between insertion points and to evaluate its feasibility for estimating length chan...
| Publicado en: | Medical & Biological Engineering & Computing Vol. 52; no. 6; pp. 511 - 521 |
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| Autores principales: | , , , , |
| Formato: | research Journal Article |
| Publicado: |
Springer Nature
Jun2014
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=103823451&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 103823451 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 01400118 PO0 jtl: Medical & Biological Engineering & Computing issn: 01400118 maglogo: N pubinfo: dt: Jun2014 vid: 52 iid: 6 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 103823451 NLM24752419 2012583694 10.1007/s11517-014-1156-8 NLM24752419 103823451 ppf: 511 ppct: 10 formats: fmt: @attributes: type: P tig: atl: Automatic string generation for estimating in vivo length changes of the medial patellofemoral ligament during knee flexion. aug: au: Graf, Matthias Diether, Salomon Vlachopoulos, Lazaros Fucentese, Sandro Fürnstahl, Philipp affil: Computer Assisted Research and Development Group, University Hospital Balgrist, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland. sug: subj: Imaging, Three-Dimensional Methods Ligaments Anatomy and Histology Knee Joint Anatomy and Histology Range of Motion Physiology Adult Kinematics Physiology Human Ligaments Physiology Ligaments Radiography Male Knee Joint Physiology Knee Joint Radiography Tomography, X-Ray Computed Weight-Bearing Adult: 19-44 years Male ab: Modeling ligaments as three-dimensional strings is a popular method for in vivo estimation of ligament length. The purpose of this study was to develop an algorithm for automated generation of non-penetrating strings between insertion points and to evaluate its feasibility for estimating length changes of the medial patellofemoral ligament during normal knee flexion. Three-dimensional knee models were generated from computed tomography (CT) scans of 10 healthy subjects. The knee joint under weight-bearing was acquired in four flexion positions (0°-120°). The path between insertion points was computed in each position to quantify string length and isometry. The average string length was maximal in 0° of flexion (64.5 ± 3.9 mm between femoral and proximal patellar point; 62.8 ± 4.0 mm between femoral and distal patellar point). It was minimal in 30° (60.0 ± 2.6 mm) for the proximal patellar string and in 120° (58.7 ± 4.3 mm) for the distal patellar string. The insertion points were considered to be isometric in 4 of the 10 subjects. The proposed algorithm appears to be feasible for estimating string lengths between insertion points in an automatic fashion. The length measurements based on CT images acquired under physiological loading conditions may give further insights into knee kinematics. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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