Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Biomechanics
| Question | Answer |
|---|---|
| What is the joint reaction force? | force the joint exerts back against forces from muscles, passive tissues, and gravity |
| What are "degrees of freedom?" | # of independent movements allowed at a joint *Joints can have up to 3, one in each plane |
| What is a loose-packed position? | least stable joint; more available accessory motion (slides & spins) |
| What is a closed pack position? | maximum joint stability; least amount of accessory motion (slides & spins) |
| What is the law of parsimony? | nervous system tends to activate the fewest muscles or muscle fibers possible for the control of a joint action |
| Valgus | distal segment angles away from midline |
| Shoulder ABD/scaption is coupled with _______. | ER |
| What does asymmetry in the trochlea cause? | ulna to deviate laterally |
| What is the most unstable carpal? | lunate |
| What is the most commonly torn rotator cuff muscle? | supraspinatus |
| What fills the ulnocarpal space? | TFCC |
| What joint attaches the shoulder complex to the body? | sternoclavicular |
| What is the "ACL" of the shoulder? | long head of the biceps; restricts anterior translation |
| What is the functional ROM of the elbow? | 30-130 degrees |
| What is normal femoral anteversion? | 15 degrees > 15: excessive anteversion < 15: retroversion |
| What compensation might you see in someone with excessive anteversion? | In-toeing |
| What type of bone withstands large forces? | compact |
| What type of bone absorbs forces and concentrates along lines of stress? | cancellous |
| How much of the femoral head is covered with articular cartilage? Where is it thickest? | the entire surface; thickest in a broad region above and slightly anterior to the fovea |
| Where does the femur get its main blood supply? | Medial and lateral circumflex arteries |
| What digits/carpals form the central pillar? | 2nd & 3rd digits, capitate and trapezoid |
| What "middle-man" joint connects the scapula and clavicle? | AC joint |
| What restrains the lunate against volar dislocation? | dorsal radiocarpal ligament |
| What is the primary stabilizer of the DRUJ? | TFCC |
| Varus | Distal segment angles towards midline |
| What fills the acetabular notch as a continuation of the labrum? | transverse acetabular ligament |
| What can excessive acetabular anteversion do? | expose the joint anteriorly and put it at risk of dislocation (esp. at extreme ER) |
| What is the femoral angle of inclination? | 125 degrees |
| What can cause scapular tipping? | short pecs or weak lats, lower trap, and serratus anterior |
| What is coxa vara? | femoral angle of inclination <125 degrees |
| What is coxa valga? | femoral angle of inclination >125 degrees |
| What are the suspensory muscles of the scapula? | Rhomboids Levator scap Upper trap |
| What is the GHJ open-packed position? | 40-55 degrees of scaption (40-55 ABD + 30 horz. ADD) |
Created by:
ereul1