Human KneeJoint Mechanics Module Development - PowerPoint PPT Presentation

Loading...

PPT – Human KneeJoint Mechanics Module Development PowerPoint presentation | free to view - id: 109fc7-ZGFhY



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Human KneeJoint Mechanics Module Development

Description:

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

Number of Views:60
Avg rating:3.0/5.0
Slides: 14
Provided by: rafre
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

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
  • Cruciate linkage 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
Exercises leading to Challenge 1
  • 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
    either your ACL or PCL.

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
  • Create your own WM2D Cruciate Linkage model of
    the knee.
  • Follow the steps detailed in
  • CruciateLinkDev.doc
  • 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
(No Transcript)
13
(No Transcript)
About PowerShow.com