# Human KneeJoint Mechanics Module Development - PowerPoint PPT Presentation

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## Human KneeJoint Mechanics Module Development

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### Exercise 2: Draw a FBD of the Tibia for an isometric knee-extension exercise. ... Consider knee flexion during an isometric leg curl exercise. ... – PowerPoint PPT presentation

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Title: Human KneeJoint Mechanics Module Development

1
Human Knee-Joint Mechanics Module Development
• Dr. Robert Freeman
• Ms. Julie L. Fife
• University of Texas - Pan American
• July 30, 2004

2
Project Goals
• To investigate the functional anatomy of the
• human knee using a number of distinct sagittal
• plane models
• Tibiofemoral Joint Variants
• Simple hinge joint model
• Single-point surface contact model
• Patellofemoral Joint Variants
• Single-point patella model
• Rigid-body patella model

3
Challenge 1
Can voluntary contraction of the quadriceps
muscle group tear the ACL during an isometric
knee extension exercise?
4
Cruciate Linkage Model with Single-Point Patella
5
Working Model 2D Version of Cruciate Linkage Model
•

6
• Exercise 1 What "knee" muscles and ligaments are
active during Knee extension?
• Consider only sagittal plane motion.
• Exercise 2 Draw a FBD of the Tibia for an
isometric knee-extension exercise.
• Assume the ankle/foot is rigidly attached to the
tibia and that there is no friction between the
femoral condyles and the (flat) tibial plateau.
• Exercise 3 Given the patellar-tendon force as a
function of the flexion angle FPT(q), compute the
force in the ACL as a function of flexion angle.
• Given that the maximum force that the ACL can
withstand is 2000N, answer the challenge.

7
Challenge 2
• What constraint forces and moment are required to
keep the femur fixed during the isometric knee
extension exercise of challenge 1?

8
Challenge 3a
• Consider knee flexion during an isometric leg
curl exercise.
• Develop an appropriate FBD and solution procedure
required to determine if you can voluntarily tear

9
Challenge 3b
• Consider knee extension during an isometric
squat-to-stand exercise.
• Develop an appropriate FBD and solution procedure
required to determine the maximum weight you can
squat.

10
Challenge 4
the knee.
• Follow the steps detailed in
• And the associated tutorial videos

11
Patellar Tendon Force
• The patellar tendon force (in Newtons) is given
below as the fifth order polynomial in the
flexion angle ? (in degrees).
• This polynomial was obtained as an approximation
of the results given in Figure 6 of Serpas, et.al.

Fpt(?) 439.106 (305.71?1) (-18.185?2)
(0.554?3) (-6.674 x 10-3?4) (2.5x10-5?5)
12
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