Anatomical study of the radius and center of curvature of the distal femoral condyle

Handle URI:
http://hdl.handle.net/10754/561528
Title:
Anatomical study of the radius and center of curvature of the distal femoral condyle
Authors:
Kosel, Jürgen ( 0000-0002-8998-8275 ) ; Giouroudi, Ioanna; Scheffer, Cornie; Dillon, Edwin Mark; Erasmus, Pieter J.
Abstract:
In this anatomical study, the anteroposterior curvature of the surface of 16 cadaveric distal femurs was examined in terms of radii and center point. Those two parameters attract high interest due to their significance for total knee arthroplasty. Basically, two different conclusions have been drawn in foregoing studies: (1) The curvature shows a constant radius and (2) the curvature shows a variable radius. The investigations were based on a new method combining three-dimensional laser-scanning and planar geometrical analyses. This method is aimed at providing high accuracy and high local resolution. The high-precision laser scanning enables the exact reproduction of the distal femurs - including their cartilage tissue - as a three-dimensional computer model. The surface curvature was investigated on intersection planes that were oriented perpendicularly to the surgical epicondylar line. Three planes were placed at the central part of each condyle. The intersection of either plane with the femur model was approximated with the help of a b-spline, yielding three b-splines on each condyle. The radii and center points of the circles, approximating the local curvature of the b-splines, were then evaluated. The results from all three b-splines were averaged in order to increase the reliability of the method. The results show the variation in the surface curvatures of the investigated samples of condyles. These variations are expressed in the pattern of the center points and the radii of the curvatures. The standard deviations of the radii for a 90 deg arc on the posterior condyle range from 0.6 mm up to 5.1 mm, with an average of 2.4 mm laterally and 2.2 mm medially. No correlation was found between the curvature of the lateral and medial condyles. Within the range of the investigated 16 samples, the conclusion can be drawn that the condyle surface curvature is not constant and different for all specimens when viewed along the surgical epicondylar axis. For the portion of the condylar surface that articulates with the tibia during knee flexion-extension, the determined center points approximate the location of the centers of rotation. The results suggest that the concept of a fixed flexion-extension axis is not applicable for every specimen. Copyright © 2010 by ASME.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division; Electrical Engineering Program; Sensing, Magnetism and Microsystems Lab
Publisher:
ASME International
Journal:
Journal of Biomechanical Engineering
Issue Date:
2010
DOI:
10.1115/1.4002061
PubMed ID:
20815636
Type:
Article
ISSN:
01480731
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Electrical Engineering Program; Sensing, Magnetism and Microsystems Lab; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorKosel, Jürgenen
dc.contributor.authorGiouroudi, Ioannaen
dc.contributor.authorScheffer, Cornieen
dc.contributor.authorDillon, Edwin Marken
dc.contributor.authorErasmus, Pieter J.en
dc.date.accessioned2015-08-02T09:13:31Zen
dc.date.available2015-08-02T09:13:31Zen
dc.date.issued2010en
dc.identifier.issn01480731en
dc.identifier.pmid20815636en
dc.identifier.doi10.1115/1.4002061en
dc.identifier.urihttp://hdl.handle.net/10754/561528en
dc.description.abstractIn this anatomical study, the anteroposterior curvature of the surface of 16 cadaveric distal femurs was examined in terms of radii and center point. Those two parameters attract high interest due to their significance for total knee arthroplasty. Basically, two different conclusions have been drawn in foregoing studies: (1) The curvature shows a constant radius and (2) the curvature shows a variable radius. The investigations were based on a new method combining three-dimensional laser-scanning and planar geometrical analyses. This method is aimed at providing high accuracy and high local resolution. The high-precision laser scanning enables the exact reproduction of the distal femurs - including their cartilage tissue - as a three-dimensional computer model. The surface curvature was investigated on intersection planes that were oriented perpendicularly to the surgical epicondylar line. Three planes were placed at the central part of each condyle. The intersection of either plane with the femur model was approximated with the help of a b-spline, yielding three b-splines on each condyle. The radii and center points of the circles, approximating the local curvature of the b-splines, were then evaluated. The results from all three b-splines were averaged in order to increase the reliability of the method. The results show the variation in the surface curvatures of the investigated samples of condyles. These variations are expressed in the pattern of the center points and the radii of the curvatures. The standard deviations of the radii for a 90 deg arc on the posterior condyle range from 0.6 mm up to 5.1 mm, with an average of 2.4 mm laterally and 2.2 mm medially. No correlation was found between the curvature of the lateral and medial condyles. Within the range of the investigated 16 samples, the conclusion can be drawn that the condyle surface curvature is not constant and different for all specimens when viewed along the surgical epicondylar axis. For the portion of the condylar surface that articulates with the tibia during knee flexion-extension, the determined center points approximate the location of the centers of rotation. The results suggest that the concept of a fixed flexion-extension axis is not applicable for every specimen. Copyright © 2010 by ASME.en
dc.publisherASME Internationalen
dc.subjectCenters of rotationen
dc.subjectCondyle surfaceen
dc.subjectFemoral condyleen
dc.subjectFlexion-extension axisen
dc.subjectKnee anatomyen
dc.titleAnatomical study of the radius and center of curvature of the distal femoral condyleen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
dc.contributor.departmentElectrical Engineering Programen
dc.contributor.departmentSensing, Magnetism and Microsystems Laben
dc.identifier.journalJournal of Biomechanical Engineeringen
dc.contributor.institutionDepartment of Mechanical and Mechatronic Engineering, Stellenbosch University, Private Bag X1, Matieland 7602, South Africaen
dc.contributor.institutionKnee Clinic Stellenbosch, Stellenbosch Medi-Clinic, Die Boord, Stellenbosch 7600, South Africaen
kaust.authorKosel, Jürgenen
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