Knee Notes

51 cards

Ligaments of Knee notes for Rehab Anatomy UW


 
  
Created Nov 18, 2008
by
rockinanatomy

 

 
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1
What are the major features of Medial Collateral Ligament?
 
1) Wide, band-like ligament 2) 2 major portions: Deep & Superficial 3) Continuous with the...
2
What does the MCL resist?
 
VALGUS (and some fibers resist medial and lateral rotation)
3
What is the function of the MCL?
 
To stabilize the knee against valgus stress and resist rotational and anterior forces on tibia.
4
What are the major features of the Lateral Collatoral Ligament?
 
1) Rounded, pencil-like ligament. 2) Easy to palpate 3) NOT continuous w/ capsule
5
What does the LCL resist?
 
VERUS (and extreme rotations at knee)
6
What are the attachments of Anterior Cruciate Ligament (ACL)?
 
Prox.: Medial aspect of lateral femoral condyle Distal: Anterior aspect of intercondylar eminence...
7
What are the functions of the ACL?
 
1) STABILIZE knee from displace tibia Anteriorly on femor "anterior drawer" 2) Draws tight...
8
What are the attachments of Posterior Cruciate Ligament (PCL)?
 
Prox: Lateral aspect of medial femoral condyle at intercondylar notch. Distal: Posterior aspect...
9
What are the functions of the PCL?
 
Prevent displacement of tibia posteriorly "posterior drawer"
10
What do the PCL and ACL do together?
 
Hold knee together and allow normal movements
11
What makes up the terrible triad?
 
1) Medial collateral ligament 2) medial meniscus 3) anterior cruciate ligament
12
What is closed packed position for leg at knee?
 
Full extension with ER
13
Patella surface--Posterior what texture? Anterior: what texture?
 
Posterior: smoothe Anterior: rough for attachment of fibers and entrance of blood vessels
14
Surface of femur--Define CAM-shaped
 
Radius greater in some places than in others. Effects axis of motion
15
Knee is more stable in which position: flexion or extension?
 
Flexion
16
Restoring flexion of knee at last 10 degrees: easy or hard? Why?
 
It is hard because you have to move joint surfaces further.
17
Patella is developed where?
 
Quadriceps tendon
18
Functions of the Patella
 
1) redirect the line of pull of the quads 2) prevents excessive wear on the tendon 3) Increases...
19
Patella: Medial base
 
Point of attachment of Vastus Medialis
20
Patella: Lateral base
 
Point of attach: Vastus Lateralis
21
Ligaments that reinforce capsule: Anterior
 
Medial and Lateral Retinaculae
22
Ligaments that reinforce capsule: Laterally
 
Iliotibial band
23
Ligaments that reinforce capsule: Medially
 
Medial Collateral ligament
24
Synovium
 
1) Inside Joint cavity but by passes intercondylar space. 2) Excludes the cruciate ligaments...
25
Which gets more injured: Posterior cruciate or Anterior cruciate ligaments?
 
Anterior
26
Pronation of foot--combo of what move?
 
Mostly Eversion, some lateral rotation and dorsiflexion.
27
Supination of foot--combo of what move?
 
Mostly Inversion, some medial rotation and plantar flex.
28
Medial meniscus has what shape and where does it attach?
 
"C" shaped and it attaches anteriorly and posteriorly on the intercondylar eminence.
29
Medial meniscus: How is stability reinforced?
 
The deep portion of the medial collateral ligament
30
Which is more susceptible to injury: Medial or Lateral Meniscus? Why?
 
Medial meniscus b/c it is much less mobile and medial condyle more mobile than lateral condyle....
31
Lateral meniscus has what shape and where does it attach?
 
"O" shape. Major attachment posteriorly from popliteus tendon.
32
What is Condromalacia of patella?
 
The cartalege softening and fibrillation.
33
Motion of knee: What are the 2 main mechanisms?
 
Sliding and Rocking
34
Knee as "Hinge" joint. Does it occur around single axis?
 
No. The axis is constantly changing throughout range of flexion.
35
"Screw Home Mechanism" describes what?
 
The fact that at terminal knee extension, the tibia EXTERNALLY rotates on femur approx. 15...
36
What is the effect of the Screw Home Mechanism?
 
To allow a person to stand fully extended for long time w/o use of muscle power or knee collapsing...
37
Reason 1 why Screw Home Mechanism occurs
 
As knee moves to full EXTENSION the ANTERIOR movement of tibia is stopped by the ACL.
38
Reason 2 why Screw Home Mechanism occurs
 
B/c ACL is attached to LATERAL femoral condyle, motion is stopped.
39
Reason 3 why Screw Home Mechanism occurs
 
B/c medial femoral condyle is longer than lateral condyle and not fixed by ACL, it will continue...
40
What two lines form the Q angle?
 
1) line from ASIS to center of patella 2) line following line (direction of fibers) of patellar...
41
Why is Q angle significant?
 
1) Abnormal biomechanics of patella are attributed to excessive Q angles. 2) Can result in...
42
To work with Q angle, what do you need to strengthen?
 
ER at hip and VMO
43
True or false: The lateral meniscus has an attachment to lateral collateral ligament
 
False
44
Both menisci are attached to what?
 
Synovial and fibrous layers of the joint capsule
45
True or false: The medial meniscus is anchored firmly to the tibial collatoral ligaments?
 
True
46
Mensici are most likely to be torn when knee is flexed or extended?
 
Flexed
47
What is one of 3 main functions of Menisci?
 
1) Joint nutrition (synovial fluid & lub)
48
What is second of 3 main functions of Menisci?
 
2) Increase surface area for weight distribution
49
What is third of 3 main functions of Menisci?
 
3) Increase stability of knee
50
Common severe athletic injury to knee would result in tearing of which 2 ligaments and 1 meniscus?
 
Medial collateral and anterior cruciate ligaments. And often: medial meniscus
51
Rupture of which ligament can result from automibile accident where person crashes into "dashboard"?
 
Posterior cruciate


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