Material properties of the human posterior knee capsule

H.H. Rachmat, Dennis Janssen, Tony van Tienen, R.L. Diercks, Bart Verkerke, Nico Verdonschot

Research output: Contribution to journalConference articleAcademicpeer-review

Abstract

BACKGROUND: There is considerable interest to develop accurate subject-specific biomechanical models of the knee. Most of the existing models currently do not include a representation of the posterior knee capsule. In order to incorporate the posterior capsule in knee models, data is needed on its mechanical properties.

OBJECTIVE: To quantify the mechanical properties of the human posterior knee capsule through semi-static tensile tests.METHODS:Fifteen posterior knee capsule specimens (5 knees, 3 male, 2 female; age 79.2±7.9 years) were used to perform tensile tests. A medial, central and lateral specimen was taken from each knee. The cross-sectional area was measured, after which semi-static tensile tests were performed to quantify the material properties.

RESULTS: The stiffness of the capsule was randomly distributed over the regions. The global Young’s modulus and yield strength was 8.58 ± 10.77 MPa and 1.75 ± 1.89 MPa, respectively. A strong correlation (ρ = 0.900) was found between Young’s modulus and yield strength. The location of failure was not associated with smallest cross-sectional area or highest strain.

CONCLUSIONS: The results suggest that the posterior knee capsule does not have a systematic (medial–central–lateral) distribution of material properties. The posterior capsule may play an important role in knee joint mechanics, particularly when in hyper extension.
Original languageEnglish
Article numberS380
Number of pages1
JournalJournal of biomechanics
Volume45
Issue numberSuppl. 1
DOIs
Publication statusPublished - 1 Jul 2012
Event18th Congress of the European Society of Biomechanics, ESB 2012 - Lisbon, Portugal
Duration: 1 Jul 20124 Jul 2012
Conference number: 18

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Capsules
Knee
Materials properties
Yield stress
Elastic moduli
Mechanical properties
Elastic Modulus
Mechanics
Stiffness
Knee Joint

Cite this

Rachmat, H.H. ; Janssen, Dennis ; van Tienen, Tony ; Diercks, R.L. ; Verkerke, Bart ; Verdonschot, Nico. / Material properties of the human posterior knee capsule. In: Journal of biomechanics. 2012 ; Vol. 45, No. Suppl. 1.
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Material properties of the human posterior knee capsule. / Rachmat, H.H.; Janssen, Dennis; van Tienen, Tony; Diercks, R.L.; Verkerke, Bart; Verdonschot, Nico.

In: Journal of biomechanics, Vol. 45, No. Suppl. 1, S380, 01.07.2012.

Research output: Contribution to journalConference articleAcademicpeer-review

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N2 - BACKGROUND: There is considerable interest to develop accurate subject-specific biomechanical models of the knee. Most of the existing models currently do not include a representation of the posterior knee capsule. In order to incorporate the posterior capsule in knee models, data is needed on its mechanical properties.OBJECTIVE: To quantify the mechanical properties of the human posterior knee capsule through semi-static tensile tests.METHODS:Fifteen posterior knee capsule specimens (5 knees, 3 male, 2 female; age 79.2±7.9 years) were used to perform tensile tests. A medial, central and lateral specimen was taken from each knee. The cross-sectional area was measured, after which semi-static tensile tests were performed to quantify the material properties.RESULTS: The stiffness of the capsule was randomly distributed over the regions. The global Young’s modulus and yield strength was 8.58 ± 10.77 MPa and 1.75 ± 1.89 MPa, respectively. A strong correlation (ρ = 0.900) was found between Young’s modulus and yield strength. The location of failure was not associated with smallest cross-sectional area or highest strain.CONCLUSIONS: The results suggest that the posterior knee capsule does not have a systematic (medial–central–lateral) distribution of material properties. The posterior capsule may play an important role in knee joint mechanics, particularly when in hyper extension.

AB - BACKGROUND: There is considerable interest to develop accurate subject-specific biomechanical models of the knee. Most of the existing models currently do not include a representation of the posterior knee capsule. In order to incorporate the posterior capsule in knee models, data is needed on its mechanical properties.OBJECTIVE: To quantify the mechanical properties of the human posterior knee capsule through semi-static tensile tests.METHODS:Fifteen posterior knee capsule specimens (5 knees, 3 male, 2 female; age 79.2±7.9 years) were used to perform tensile tests. A medial, central and lateral specimen was taken from each knee. The cross-sectional area was measured, after which semi-static tensile tests were performed to quantify the material properties.RESULTS: The stiffness of the capsule was randomly distributed over the regions. The global Young’s modulus and yield strength was 8.58 ± 10.77 MPa and 1.75 ± 1.89 MPa, respectively. A strong correlation (ρ = 0.900) was found between Young’s modulus and yield strength. The location of failure was not associated with smallest cross-sectional area or highest strain.CONCLUSIONS: The results suggest that the posterior knee capsule does not have a systematic (medial–central–lateral) distribution of material properties. The posterior capsule may play an important role in knee joint mechanics, particularly when in hyper extension.

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